Academic literature on the topic 'Fluoroscopic control'
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Journal articles on the topic "Fluoroscopic control"
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Geise, Richard A. "Fluoroscopy: Recording of Fluoroscopic Images and Automatic Exposure Control." RadioGraphics 21, no. 1 (2001): 227–36. http://dx.doi.org/10.1148/radiographics.21.1.g01ja19227.
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Hamilton, Amber A., Stephen J. Wallace, and S. Robert Rozbruch. "Using Mindful Behavior to Reduce Fluoroscopic Time and Radiation in Motorized Internal Femur Lengthening." Journal of Limb Lengthening & Reconstruction 9, no. 2 (2023): 82–87. http://dx.doi.org/10.4103/jllr.jllr_8_23.
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Abstract Introduction: Fluoroscopic imaging is universally employed by orthopedic surgeons in the operating room. Nonetheless, intraoperative radiation exposure has an appreciable risk for patients and operating room personnel. Mindful practice of limiting fluoroscopic shots by the operating surgeon can be a useful tool for minimizing dose-dependent radiation. Methods: Ten consecutive patients (20 limbs) undergoing bilateral femoral lengthening osteoplasty with insertion of an intramedullary lengthening nail at the study institution were selected. Intraoperative imaging from one group (control) consisting of five patients (10 limbs) who underwent the standard procedure was retrospectively reviewed. The second group (image conscious) consisted of five patients (10 limbs) who underwent the procedure while a conscious effort was made to reduce the number of extraneous fluoroscopic images. Fluoroscopic images were logged for quantity and time stamps. One-tailed Student’s t-test was used to compare the control group to the image-conscious group with a statistical significance level set to P < 0.05. Results: The number of fluoroscopic images acquired in the image-conscious group (61.2 ± 11.1) compared to the control group (112.6 ± 20.6) showed a statistically significant decrease (P = 0.006). The amount of radiation dosage absorbed in the image-conscious group (6.82 mGy ± 1.8) compared to the control group (9.89 mGy ± 2.7) was also statistically significant (P = 0.037). The average total operative time per limb in the control group was 103 min (±15) versus 106 min (±12) in the image-conscious group (P = 0.399). There was no significant difference between the groups for age, body mass index, nail diameter, or nail length. There were no intraoperative complications or need for revision surgery in either group. Discussion: Image-conscious fluoroscopy leads to a 45.7% reduction in radiation dosage with a statistically significant decrease in the number of images taken, absorbed dosage, and fluoroscopic imaging time in a standardized procedure without increasing operating room time or perioperative complications. Conclusion: Orthopedic surgeons have the potential to minimize the adverse effects of radiation exposure in the operating room by being mindful about avoiding excessive fluoroscopy shots.
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West, Karl, Sara Al-Nimer, Vikash R. Goel, et al. "Three-Dimensional Holographic Guidance, Navigation, and Control (3D-GNC) for Endograft Positioning in Porcine Aorta: Feasibility Comparison With 2-Dimensional X-Ray Fluoroscopy." Journal of Endovascular Therapy 28, no. 5 (2021): 796–803. http://dx.doi.org/10.1177/15266028211025026.
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Objectives Intraprocedural deployment of endovascular devices during complex aortic repair with 2-dimensional (2D) x-ray fluoroscopic guidance poses challenges in terms of accurate delivery system positioning and increased risk of x-ray radiation exposure with prolonged fluoroscopy times, particularly in unfavorable anatomy. The objective of this study was to assess feasibility of using an augmented reality (AR) system to position and orient a modified aortic endograft delivery system in comparison with standard fluoroscopy. Materials and Methods The 3-dimensional guidance, navigation, and control (3D-GNC) prototype system was developed for eventual integration with the Intra-Operative Positioning System (IOPS, Centerline Biomedical, Cleveland, OH) to project spatially registered 3D holographic representations of the subject-specific aorta for intraoperative guidance and coupled with an electromagnetically (EM) tracked delivery system for intravascular navigation. Numerical feedback for controlling the endograft landing zone distance and ostial alignment was holographically projected on the operative field. Visualization of the holograms was provided via a commercially available AR headset. A Zenith Spiral-Z AAA limb stent-graft was modified with a scallop, 6 degree-of-freedom EM sensor for tracking, and radiopaque markers for fluoroscopic visualization. In vivo, 10 interventionalists independently positioned and oriented the delivery system to the ostia of renal or visceral branch vessels in anesthetized swine via open femoral artery access using 3D-GNC and standard fluoroscopic guidance. Procedure time, fluoroscopy time, cumulative air kerma, and contrast material volume were recorded for each technique. Positioning and orientation accuracy was determined by measuring the target landing-zone distance error (δLZE) and the scallop-ostium angular alignment error (θSOE) using contrast-enhanced cone beam computed tomography imaging after each positioning for each technique. Mean, standard deviation, and standard error are reported for the performance variables, and Student’s t tests were used to evaluate statistically significant differences in performance mean values of 3D-GNC and fluoroscopy. Results Technical success for the use of 3D-GNC to orient and position the endovascular device at each renal-visceral branch ostium was 100%. 3D-GNC resulted in 56% decrease in procedure time in comparison with standard fluoroscopic guidance (p<0.001). The 3D-GNC system was used without fluoroscopy or contrast-dye administration. Positioning accuracy was comparable for both techniques (p=0.86), while overall orientation accuracy was improved with the 3D-GNC system by 41.5% (p=0.008). Conclusions The holographic 3D-GNC system demonstrated improved accuracy of aortic stent-graft positioning with significant reductions in fluoroscopy time, contrast-dye administration, and procedure time.
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Cooney, P., D. M. Marsh, and J. F. Malone. "Automatic Exposure Control in Fluoroscopic Imaging." Radiation Protection Dosimetry 57, no. 1-4 (1995): 269–72. http://dx.doi.org/10.1093/oxfordjournals.rpd.a082539.
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Cooney, P., D. M. Marsh, and J. F. Malone. "Automatic Exposure Control in Fluoroscopic Imaging." Radiation Protection Dosimetry 57, no. 1-4 (1995): 269–72. http://dx.doi.org/10.1093/rpd/57.1-4.269.
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Sheen, Jae Jon, Yuan Yuan Jiang, Young Eun Kim, Jun Young Maeng, Tae-Il Kim, and Deok Hee Lee. "Increase in fluoroscopic radiation dose in successive sessions of multistage Onyx embolization of brain arteriovenous malformations compared with the first session." Journal of NeuroInterventional Surgery 10, no. 12 (2018): e36-e36. http://dx.doi.org/10.1136/neurintsurg-2017-013706.
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Background and purposeOnyx embolization is a treatment for brain arteriovenous malformations (AVMs). However, multistage embolization usually involves the presence of radiodense Onyx cast from the previous sessions, which may influence the fluoroscopic radiation dose. We compared the fluoroscopic dose between the initial and final embolization sessions.Materials and methodFrom January 2014 to September 2016, 18 patients underwent multistage Onyx embolization (more than twice) for brain AVMs. The total fluoroscopic duration (minutes), dose–area product (DAP, Gy×cm2), and cumulative air kerma (CAK, mGy) of both the frontal and lateral planes were obtained. We compared the frontal and lateral fluoroscopic dose rates (dose/time) of the final embolization session with those of the initial session. The relationship between the injected Onyx volume and radiation dose was tested.ResultsThe initial and final procedures on the frontal plane showed significantly different fluoroscopic dose rates (DAP: initial 0.668 Gy×cm2/min, final 0.848 Gy×cm2/min, P=0.02; CAK: initial 12.7 mGy/min, final 23.1 mGy/min, P=0.007). Those on the lateral plane also showed a similar pattern (DAP: initial 0.365 Gy×cm2/min, final 0.519 Gy×cm2/min, P=0.03; CAK: initial 6.2 mGy/min, final 12.9 mGy/min, P=0.01). The correlation between the cumulative Onyx volume (vials) and radiation dose ratio of both planes showed an increasing trend (rho 0.4325–0.7053; P=0.0011–0.0730).ConclusionOwing to the automatic exposure control function during fluoroscopy, successive Onyx embolization procedures increase the fluoroscopic radiation dose in multistage brain AVM embolization because of the presence of radiodense Onyx mass.
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Postol, Yаroslav, and Andriy Sahalevych. "Endoscopically Controlled Access in Percutaneous Nephrolithotripsy, as a Method of Improving the Safety of Surgical Treatment." Health of Man, no. 1 (March 28, 2025): 29–36. https://doi.org/10.30841/2786-7323.1.2025.325006.
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The objective: to сompare the safety and effectiveness of percutaneous access in mini percutaneous nephrolithotripsy (mPCNL) with combined control (ultrasound and fluoroscopy) versus mPCNL with multiparametric monitoring (combined and retrograde-endoscopic). Materials and methods. 100 randomly selected patients with solitary kidney stones (measuring 2.0 to 3.0 cm) were divided into two groups based on the type of percutaneous access. Group I: mPCNL with percutaneous access created using combined ultrasound and fluoroscopic guidance – 54 cases (54.0%); Group II: mPCNL with percutaneous tract formation using multiparametric control (ultrasound, fluoroscopic, and retrograde-endoscopic guidance) – 46 cases (46.0%). There were no statistically significant differences in patient demographics or stone characteristics between the groups. Results. In the mPCNL group, patients who underwent multiparametric-controlled percutaneous access showed a reduction in the difference between preoperative and postoperative hemoglobin levels: 8.31 ± 2.51 vs 12.05 ± 2.05 g/L (p < 0.05). There was also a reduction in intraoperative fluoroscopic exposure time: 1 min 40 sec ± 20 sec vs 2 min 30 sec ± 30 sec (p < 0.05); a shorter operative time: 79.02 ± 15.30 vs 88.33 ± 10.20 min (p < 0.05); and reduced postoperative hospital stays: 1.37 ± 0.30 vs 2.42 ± 0.20 days (p < 0.05). Additionally, in the multiparametric-controlled access group, there was a tendency toward a lower overall complication rate (10.87 vs 14.81%, p = 0.929), reduced pain levels (1.90 ± 1.12 vs 2.60 ± 1.34 points, p = 0.412), and improved stone-free rate (SFR) (97.83 vs 92.59%, p = 0.233). However, these differences did not reach statistical significance. Conclusions. High effectiveness of operations was observed when both classic-combined (ultrasound and fluoroscopy-guided) and multiparametric-controlled (ultrasound, fluoroscopy, and retrograde endoscopic) percutaneous access techniques were used during mPCNL. Multiparametric-controlled percutaneous access during mPCNL demonstrated a trend toward a reduction in the frequency of intraoperative complications with a significant reduction in blood loss due to additional visual control of the transparenchymal access. This approach minimizes trauma to the renal collecting system structures, particularly benefiting endourologists with limited experience in percutaneous surgery.
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Jane, John A., Kamal Thapar, Tord D. Alden, and Edward R. Laws. "Fluoroscopic Frameless Stereotaxy for Transsphenoidal Surgery." Neurosurgery 48, no. 6 (2001): 1302–8. http://dx.doi.org/10.1097/00006123-200106000-00025.
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Abstract OBJECTIVE To assess the value of frameless fluoroscopy-guided stereotactic transsphenoidal surgery using the FluoroNav Virtual Fluoroscopy System (Medtronic Sofamor Danek, Inc., Memphis, TN). METHODS Twenty consecutive patients undergoing transsphenoidal surgery for sellar lesions were assigned to transsphenoidal surgery with or without computer-assisted fluoroscopic image guidance using the FluoroNav system. Prospective data regarding patient age, sex, lesion characteristics, operative time, and treatment cost were obtained. RESULTS Although patients in the FluoroNav group were, on average, 17 years younger than the patients in the control group, more patients with recurrent adenomas were treated in the image guidance group. No other significant differences between the groups were found. FluoroNav provided accurate, continuous information regarding the anatomic midline trajectory to the sella turcica as well as anatomic structures (e.g., sella, sphenoid sinus) in the lateral view. No patient required reversion to intraoperative videofluoroscopy. No statistically significant differences were found with regard to preincision setup time, operative time, or cost. FluoroNav allowed procedures to be performed with significantly fewer x-rays being taken. CONCLUSION Fluoroscopic computer-assisted frameless stereotaxy furnishes accurate real-time information with regard to midline structures and operative trajectory. Although it is useful in first-time transseptal transsphenoidal surgery, its primary benefit is realized in recurrent surgery.
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Jakobs, Ralf, Julio C. Pereira-Lima, Aline W. Schuch, Lucas F. Pereira-Lima, Axel Eickhoff, and Juergen F. Riemann. "Endoscopic laser lithotripsy for complicated bile duct stones: is cholangioscopic guidance necessary?" Arquivos de Gastroenterologia 44, no. 2 (2007): 137–40. http://dx.doi.org/10.1590/s0004-28032007000200010.
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BACKGROUND: Endoscopic papillotomy is successful in more than 95% of the cases of choledocholithiasis. For patients with difficult bile duct stones not responding to mechanical lithotripsy, different methods for stone fragmentation have been developed. AIM: To compare the results of laser lithotripsy with a stone-tissue recognizing system, when guided by fluoroscopy only or by cholangioscopy. METHODS: Between 1992 and 2002 we have treated 89 patients with difficult bile duct stones by endoscopic retrograde cholangiopancreatography and laser lithotripsy. Unsuccessful extracorporeal shock-wave lithotripsy and electrohydraulic were also performed before laser in 35% and 26% of the cases, respectively. RESULTS: Laser was effective in 79.2% of 72 patients guided by cholangioscopy and in 82.4% of 17 cases steered by fluoroscopy. The median number of impulses in the latter was 4,335 and 1,800 with the former technique. Two parameters influenced the manner of laser guidance. In cases of stones situated above a stricture, cholangioscopic control was more effective (64.7% vs. 31.9%). When the stones were in the distal bile duct, fluoroscopic control was more successful. CONCLUSION: In cases of difficult stones in the distal bile duct, laser lithotripsy under fluoroscopic control is very effective and easily performed. Cholangioscopic guidance should be recommended just in cases of intrahepatic stones or in patients with stones situated proximal to a bile duct stenosis. In these cases, cholangioscopy should be performed either endoscopically or percutaneously.
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He, Miao, Shanshan Tian, Jian Liu, Xu Deng, and Jiangxia Xiang. "Imaging Evaluation of Insertion Point Accuracy in Retrograde Intramedullary Femoral Nailing." BioMed Research International 2022 (October 28, 2022): 1–7. http://dx.doi.org/10.1155/2022/6068490.
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Objective. When compared with visual retrograde intramedullary nail placement in the femur, fluoroscopic retrograde intramedullary nail placement in the femur improved the accuracy of insertion. Methods. Ninety-six patients treated with retrograde intramedullary nailing of the femur for femoral fracture were included in this retrospective case-control study, including 48 patients treated with nailing under direct vision and 48 patients treated with nailing under fluoroscopy. Influencing factors potentially associated with the deviation of the needle insertion point on the coronal and sagittal planes (including the needle insertion method, use of limited open reduction, side, intramedullary nail diameter, mechanism of injury, and fracture classification) were analyzed univariately; then, the variables with a p value < 0.20 on univariate analysis were included in the linear regression equation to assess the independent factors associated with needle insertion point deviation. Results. On the coronal plane, the insertion point deviation in the visual nail placement group ( 1.11 ± 4.08 mm) was not significantly different ( p = 0.13 ) from that in the fluoroscopic nail placement group − 0.44 ± 3.48 mm ; on the sagittal plane, the insertion point deviation in the visual nail placement group ( 4.91 ± 4.67 mm) was significantly greater than that in the fluoroscopic nail placement group ( 2.08 ± 2.97 mm) ( p < 0.01 ). Visual nail placement was a risk factor for insertion point deviation on the sagittal plane compared with fluoroscopic nail placement ( β = − 0.84 , p < 0.01 ). Conclusion. Compared with visual nail placement, fluoroscopic nail placement improves the accuracy of insertion on the sagittal plane, with no difference between the two methods on the coronal plane. These findings indicate that surgeons should exercise more caution when placing nails under direct vision.
Dissertations / Theses on the topic "Fluoroscopic control"
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Lammoglia, Patricia. ""Elaboração e Implementação de Testes de Controle de Qualidade em Equipamentos de Angiografia por Subtração Digital"." Universidade de São Paulo, 2001. http://www.teses.usp.br/teses/disponiveis/85/85131/tde-23072002-091706/.
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Foram elaborados e implementados testes de controle de qualidade em equipamentos de angiografia por subtração digital. Estes testes foram baseados em normas nacionais e internacionais e foram implementados em cinco equipamentos de três instituições diferentes. Estes testes avaliam os parâmetros de desempenho dos equipamentos e são utilizados para a determinação da taxa de kerma no ar na entrada da pele do paciente e do corpo clínico. Os testes foram realizados utilizando dispositivos, simuladores de pacientes e câmaras de ionização. Os testes convencionais e do sistema de subtração digital indicaram que os equipamentos avaliados encontravam-se em bom estado de desempenho. Os testes para verificação da taxa de kerma no ar indicaram que um dos equipamentos avaliados apresentou altas taxas de kerma no ar na entrada da pele do paciente em modo fluoroscopia. Este problema foi notificado, e as devidas providências foram imediatamente tomadas pela gerência do hospital.<br>Quality control tests were elaborated and implementated in digital subtraction angiography equipments. These tests were elaborated based in national and international standards, and they were implementated in five equipments of three different institutions. These tests are utilized to evaluate the performance of these equipments and to determine the patient entrance and personnel air kerma rates. The tests were performed using test tools, patient phantoms e ionization chambers. The conventional tests and the tests of the digital subtraction systems indicated that the evaluated equipments presented a good performance. The tests implementated to determine the air kerma rates presented, in one case (fluoroscopy equipment), high patient entrance skin air kerma rate. This problem was notified, and the providences were promptly taken by the hospital administration.
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Salim, Rodrigo. "Estudo para validação de um referencial anatômico para controle fluoroscópico na preparação do túnel tibial em cirurgia de reconstrução do ligamento cruzado posterior." Universidade de São Paulo, 2015. http://www.teses.usp.br/teses/disponiveis/17/17142/tde-29072015-083926/.
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O objetivo primário deste estudo foi identificar parâmetros anatômicos que permitissem ao cirurgião, durante o ato cirúrgico, localizar com o auxílio de fluoroscopia o centro de inserção do ligamento cruzado posterior (LCP) na tíbia. O objetivo secundário foi propor ao cirurgião um método reprodutível e seguro para realizar a perfuração do túnel tibial na cirurgia de reconstrução do LCP. Vinte joelhos de cadáveres frescos congelados foram, inicialmente, submetidos à tomografia computadorizada de alta resolução (TC). Os joelhos foram, a seguir, dissecados e a inserção tibial do LCP digitalizada por um sistema de rastreamento óptico. A digitalização óptica da inserção do LCP resultou em modelos tridimensionais que permitiram localizar o centroide virtual dessa inserção. Paralelamente à analise virtual, inseriu-se um fio de Kirschner (FK) no centro anatômico da inserção tibial do LCP sob visualização direta. Foi realizado exame fluoroscópico no plano sagital desta tíbia e o ponto correspondente à inserção do FK foi registrado na imagem. Os locais definidos como o centro do LCP, nos dois métodos, foram plotados em uma linha imaginária paralela à faceta tibial de inserção do mesmo. Para fins de referência, essa linha foi dividida em uma escala centesimal, tendo o seu ponto zero correspondente à margem anterior/proximal da faceta e o ponto 100, correspondente à margem posterior/distal da faceta. O centro do LCP esteve situado em um ponto correspondente a 70% da distância, a partir da borda anterior/proximal da faceta do LCP, quando tomada como referência uma imagem de fluoroscopia em perfil do joelho (plano sagital). Essa medida mostrou ser reprodutível e pode ser um parâmetro útil para orientar a perfuração e inserção do fio guia tibial na confecção do túnel tibial nas cirurgias de reconstrução do LCP.<br>The primary objective of this study was to determine the center of the anatomical tibial insertion of the posterior cruciate ligament in cadaver knees and correlate this point to anatomical references as seen on fluoroscopic images of the same specimens. We aimed to describe a reproducible and safe method to place the tibial tunnel at the most anatomical position during posterior cruciate ligament reconstructions. Twenty fresh frozen cadaver knees were initially submitted to a high-resolution computadorized tomography (CT). Then, the knees were dissected and the PCL tibial insertion was digitalized with an optical tracking system. The optical digitalization of the PCL insertion resulted in tridimensional models that allowed the identification of the virtual centroid of this insertion. After the virtual analysis by CT scan, a Kirschner wire was inserted at the anatomical center of the PLC tibial insertion under direct visualization. Fluoroscopic views of the tibia on the sagittal plane were acquired and the correspondent point of the Kirschner wire insertion was registered. The points defined as the posterior cruciate ligament center by the two methods were plotted in an imaginary line parallel to the tibial facet of the PCL insertion. As a reference, this line was divided in a centesimal scale, with the zero point corresponding to the anterior/proximal margin of the facet and the 100-point, corresponding to the posterior/distal margin of the facet. The PCL center was found in one point corresponding to approximately 70% of the distance from the anterior/proximal border of the PCL facet when a lateral fluoroscopic image of the knee was utilized as a reference (sagittal plane). This measure was found to be consistently reproducible and may be a useful parameter to guide the positioning of the tibial guide wire during tibial tunnel drilling in posterior cruciate ligament reconstructions.
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Miranda, Jurema Aparecida de. "Desenvolvimento de uma metodologia para a calibração de instrumentos de medida utilizados no controle da qualidade em radiodiagnóstico intervencional." Universidade de São Paulo, 2009. http://www.teses.usp.br/teses/disponiveis/85/85131/tde-05112009-103703/.
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Radiologia intervencional é a prática na qual imagens geradas por radiação-X são usadas como uma ferramenta na condução de procedimentos diagnósticos - terapêuticos. Tanto nos procedimentos para diagnósticos como nos terapêuticos, os tempos de exposição são longos, podendo causar graves lesões no paciente, e contribuindo para a dose espalhada no corpo clínico. O Brasil ainda não possui regras bem definidas quanto às doses e dosimetria de feixes fluoroscópicos. Há um grande interesse no estudo destes feixes, quanto a qualidade do feixe, camada-semi-redutora, entre outros parâmetros. Neste trabalho foi desenvolvida uma metodologia para a calibração de instrumentos de medida utilizados no controle de qualidade em radiodiagnóstico intervencional utilizando um sistema de radiação X clínico Medicor Neo Diagnomax, no modo fluoroscópico. Foi utilizada uma câmara de ionização plana marca PTW como monitora. Algumas câmaras de ionização recomendadas para fluoroscopia foram avaliadas e calibradas em relação à câmara de ionização de referência do laboratório de calibração do IPEN. Foram implantadas as qualidades de radiação RQR3, RQR5 e RQR7 e as específicas para a fluoroscopia RQC3, RQC5 e RQC7 seguindo as recomendações da norma IEC 61267. Todas as características dos feixes foram determinadas. Para a realização deste trabalho foi construído um sistema de posicionamento de câmaras de ionização. Para a determinação de dose de entrada e saída do paciente e de radiação espalhada na posição do corpo clínico, foram construídos simuladores de acrílico. Os resultados obtidos mostram uma taxa de Kerma de entrada no simulador de 4,5 x10-3, 1,2 x10-2 e 1,9 x 10-2 Gy/min para RQC 3, RQC 5, RQC 7 respectivamente. Foram realizados testes sem e com a colimação posicionada entre a câmara monitora e o simulador e os resultados encontrados mostram uma diferença de +5,5%, +0,6% e +0,8 %. Comprovando a importância da colimação nestes procedimentos intervencionistas.<br>Interventional radiology is the technique where X radiation images are used as a tool in the conduction of diagnostic or/and therapeutic procedures. The exposition times are long for both procedures, diagnostic and therapeutic, may cause serious injuries in the patient, and also contribute to the dose of the clinical staff. In Brazil there are not yet well established rules to determine the doses and to make the dosimetry in fluoroscopic beams. There is great interest in this study, in relation to the beam quality, the half-value-layer, and others parameters. In this work a Medicor Neo Diagnomax clinical X ray generator, fluoroscopy mode, was used to develop a calibration methodology for instruments used in interventional radiology quality control. One plane parallel ionization chamber PTW was used as monitor. The ionization chambers recommended for fluoroscopy measurements had been evaluated and calibrated in relation to the IPEN Calibration Laboratory reference ionization chamber. The RQR3, RQR5 and RQR7 radiation qualities and the specific ones for fluoroscopy, RQC3, RQC5 and RQC7, were established following the norm IEC 61267. All beams characteristics were determined. Ionization chambers positioning system and the acrylic phantoms to the entrance and exit doses determination were developed and constructed. The results obtained show air kerma rates of 4.5x10-3, 1.2x10-2 and 1.9x10-2 Gy/min for RQC3, RQC5 and RQC7 respectively. Tests with and without the collimation just after the monitor chamber, were carried out and the results showed a difference of +5.5%, +0.6% e + 0.8%, confirming the importance of the collimation use in these interventionist procedures.
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Khosamadi, Majid. "Development of methods and software for rapid quality control in fluoroscopy." Thesis, Umeå universitet, Institutionen för fysik, 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-178796.
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Background: Fluoroscopy is a common imaging technique which uses X-ray to derive a real time imaging of patient anatomy to determine diagnosis and positioning of patients for interventional procedures. It is therefore important that the fluoroscopy systems maintain their performance. Assessment of image quality parameters (such as: low contrast resolution, uniformity, homogeneity and detection of defective pixels and artifacts) is one way to assess if they maintain their performance. This study aims to develop and implement a Matlab script to do a remote Quality Control (QC) and set up tolerance levels on different types of fluoroscopy systems. Method: Three fluoroscopy systems were used in this project, Siemens Axiom Artis Zee MP, Siemens Cios Alpha and Ziehm Vision RFD. There were two setups used in the study for image acquisition by adding a 2 mm Cu filter as the attenuating material placed directly on the X-ray tube. A Cylindrical aluminum contrast detail of dimension 4 mm thick and 6 mm diameter was placed in the middle of X-ray field (Setup 1 on patient couch and setup 2 directly on the flat panel detector). The fluoroscopic images were acquired with and without contrast detail over a period of six month. The image quality parameter SNR2rate was determined from signal and background images while other quality parameters such as kerma-area product rate PKA, rate, uniformity, homogeneity, low contrast resolution, SNR, defective pixels and artefact detection were examined and determined from the background images. Two additional supporting experiments were performed, one with a chest phantom and 13 cm PMMA and the other one a human visual detection 4-AFC experiment. Result: The image quality index SNR2rate and the dose rate index PKA, rate, the low contrast resolution parameter (LCRP), uniformity, homogeneity and SNR values were within ±2 standard deviation for repeated measurements in each system. Nevertheless, the result indicates that Siemens Axiom Artis Zee MP has the best performance while Ziehm Vision RFD has the worst performance between these three systems. The result from the defective pixel method indicate that for 20 % tolerance there were no defective pixels for Siemens Axiom and Cios Alpha. Ziehm Vision had also no defective pixels for 30 % tolerance. The artefact detection shows that artefact level is high for fluoroscopy systems and Ziehm Vision RFD has artefact level more than 50 % tolerance. The chest phantom experiment indicate that SNR2rate varies considerably over the lung anatomy as expected. The 4-AFC experiment indicates that the effective time was 0.14 s for human observers to integrate the information in the live image. Conclusion: The methods developed and implemented in this project were successfully able to determine and assess the image quality parameters such as SNR2rate,PKA, rate, low contrast resolution, uniformity, homogeneity, SNR and detection of defective pixels. Further effort is needed for installation of Matlab script on our local server, connection with Excel program and internal website (SharePoint) and adding more clinical fluoroscopy systems to do remote QC in Region Östergötland.
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Hofbauer, Vincent Roman. "Insertionskontrolle bei Ersatz des vorderen Kreuzbandes mit einem Bildwandler gestützten Navigationssystem." Doctoral thesis, Humboldt-Universität zu Berlin, Medizinische Fakultät - Universitätsklinikum Charité, 2006. http://dx.doi.org/10.18452/15514.
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Die Ruptur des vorderen Kreuzbandes (VKB) zählt zu den häufigsten Bandverletzungen des Menschen und wird vor allem bei jungen, aktiven Menschen primär operativ versorgt. Obwohl sich das Verständnis der Anatomie, Funktion und die Operationstechniken stetig verbessert haben ist heute die Revisionsrate nach VKB - Operation hoch. Die optimale Platzierung der Insertionspunkte ist unter arthroskopischen Bedingungen einer der kritischsten Schritte der Operation. Das Ziel der Studie war, ein Bildwandler (BV) basiertes Navigationsverfahren zu entwickeln und zu evaluieren, mit dem der femorale Bohrkanal anhand etablierter geometrischer Schablonen präzise navigiert angelegt werden kann. Die Anlage des tibialen Bohrkanals sollte in Relation zur Anatomie des Patienten auf BV-Bildern dargestellt werden können. Zur Ermittlung der Präzision des Systems wurden Insertionspunktlagen anhand abgewandelter geometrischer Schablonen mit dem Navigationssystem bestimmt, deren Lage am Modell radiologisch ausgewertet und mit den geplanten Sollwerten statistisch verglichen wurde. Außerdem wurden der Einfluss von Projektionsfehlern des BV-Bildes durch Rotation der Modelle um die Quer- und Längsachse und der Einfluss von Planungsungenauigkeiten untersucht. Das am Modell entwickelte System wurde anschließend im klinischen Einsatz auf Praktikabilität validiert. Es hat sich gezeigt, dass die femoralen Insertionspunkte am Modell unabhängig von der verwendeten Schablone mit einer hohen Präzision bestimmt werden können. Die medianen Abweichungen vom Sollwert in proximal-distaler (PD) - Richtung und in anterior-posteriorer (AP) - Richtung lagen bei allen Schablonen unter 1,00 mm. In PD-Richtung zeigte die Schablone nach Hertel et al. eine signifikant geringere Abweichung vom Sollwert als die Schablone nach Klos et al.. In AP-Richtung wurden mit der Schablone nach Hertel et al. signifikant geringere Abweichungen als mit den beiden anderen Schablonen erreicht. Bei Bestimmung des Projektionsfehlers durch Rotation lag die mediane Abweichung pro 1°-Rotation um die Längsachse in proximal-distaler (PD) - Richtung bei 0,31 % bzw. 0,07 mm und in anterior-posteriorer (AP) - Richtung bei 0,36 % bzw. 0,17 mm. Bei Quer-Rotation lag die mediane Abweichung pro 1°-Rotation in PD-Richtung bei 0,25 % bzw. 0,06 mm und in AP-Richtung bei 0,64 % bzw. 0,30 mm. Bei den Untersuchungen zur Abweichung durch Planungsungenauigkeit hat sich gezeigt, dass bei allen drei Schablonen Planungsfehler in anterior-posteriorer Richtung entlang der Blumensaat-Linie (BSL) die geringsten Auswirkungen auf die Lage des femoralen Insertionspunktes haben. Abweichungen bei der Planung in Richtung DISTAL / BSL(post.) und PROXIMAL / BSL(post.) haben die größten Fehler erbracht.<br>The Anterior Cruciate Ligament (ACL) is one of the most often torn ligaments of the musculoskeletal system. Especially in young and active people torn ACL are mainly treated surgically. Despite an increasing knowledge of the anatomical, functional and operative aspects about the ACL, there is still a high rate of long-time failures. Optimal positioning of the ACL-graft during arthroscopic reconstruction is of paramount importance in order to get good results. The aim of this project was to develop and evaluate a fluoroscopically based navigation system which could be used to precisely place the femoral drill hole with help of geometrical templates. The placement and orientation of the tibial tunnel was intended to be displayed on x-rays in relation to the patient’s anatomy. To determine the system’s precision, insertion sites where defined at the fluoroscopic image using geometrical templates and marked on plastic femur models with the help of navigation. The position of the insertion sites on the model was radiologically identified and statistically compared with the aimed ones. Additionally the influence of fluoroscopic projection errors due to axial and planar rotation of the models was tested. Following the model tests, the developed system was clinically tested in the OR to test its feasibility. The model tests revealed a high precision in femoral placement of the insertion sites independent from the three used templates (Hertel et al. / Klos et al. / Cazenave et al.). The median deviations from the aimed positions were in proximal-distal (PD) and in anterior-posterior (AP) direction both below 1.00 mm. In PD-direction the template by Hertel et al. showed a significantly lower deviation from the aimed position than the template developed by Klos et al.. In AP-direction the template by Hertel et al. showed a significantly lower deviation than the two others. The mean projection error due to longitudinal rotation per 1° was for PD-direction 0.31 % (0.07 mm) and in AP-direction 0.36% (0.17 mm). For planar rotation the median projection error per 1° was 0.25% (0.006 mm) for PD-direction and 0,64% (0.30 mm) for AP. The tests for deviation from the aimed position due to imprecise planning revealed for all templates least deviation along the Blumensaat-line (BSL) and most deviation in direction DISTAL / BSL(post.) and PROXIMAL / BSL (post.).
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Wearing, Scott C. "A biomechanical analysis of plantar fasciitis using digital fluoroscopy." Thesis, Queensland University of Technology, 2003. https://eprints.qut.edu.au/36791/1/36791_Digitised%20Thesis.pdf.
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Plantar fasciitis is the most common disorder of the foot and is characterised by pain involving the inferomedial aspect of the heel that is exacerbated by activity after periods of non-weightbearing. Despite an abundance of anecdotal evidence indicating that aberrant function of the foot is an aetiological factor in the development of plantar heel pain, there is little scientific evidence linking abnormal arch mechanics with plantar fasciitis. The primary purpose of this thesis was to investigate the biomechanics of plantar fasciitis by evaluating the sagittal plane kinematics and kinetics of the medial longitudinal arch during gait. Specifically, a low-dose motion X-ray technique, known as digital fluoroscopy, was used to evaluate the sagittal plane kinematics of the arch and a capacitance-based pressure plate was used to determine regional vertical ground reaction forces acting on the sole of the foot during gait.
Since digital fluoroscopy has not been widely used in gait analysis, the methodological phase of this study concentrated on identifying and quantifying the inherent limitations and potential errors in employing fluoroscopy as a gait analysis technique. In particular, the methodological phase evaluated the potential impact of the physical restrictions of the equipment on gait and the acquisition of gait data, as well as the magnitude of the distortion errors inherent in fluoroscopic images of the medial longitudinal arch. The findings indicate that digital fluoroscopy may be effectively used as a two-dimensional motion analysis technique for the evaluation of movement of the medial longitudinal arch during walking. The methodological studies demonstrate that the structural limitations of modem fluoroscopic systems are unlikely to substantially influence the acquisition of gait data. However, out-ofplane motion of osseous segments of the foot and the temporal response of the imaging system represent the major shortcomings of employing fluoroscopy as a gait analysis tool. Tests conducted on foot models and in vivo indicated that the application of published dist01iion correction procedures provided a method that is highly repeatable, with fluoroscopic image enors constituting less than 5 percent of the movement range.
In the experimental phase of this thesis, a digital fluoroscope and a pressure platform were used to evaluate the kinematics and kinetics of the medial longitudinal arch in people with and without plantar fasciitis. While pressure analysis demonstrated that patients with plantar fasciitis make gait adjustments that reduce the level of force beneath the rearfoot and forefoot of the symptomatic foot, fluoroscopy indicated that neither the dynamic shape nor the motion of the medial longitudinal arch differed between subjects with and without heel pain. Consequently, abnonnal arch shape and motion are not associated with the progression of plantar fasciitis. The peak arch angle was, however, positively correlated to the increased fascial thickness that was prototypic of plantar fasciitis. Thus, arch mechanics may play an important secondary role in plantar fasciitis by modifying the severity of heel pain, once present. In addition, increased loading and flexion of the digits was observed in patients with heel pain, suggesting that digital function plays an important, and previously unidentified, protective role in plantar fasciitis by bracing the medial longitudinal arch and thereby reducing the loading in the plantar fascia. The findings also suggest that plantar fasciitis may represent a bilateral process and raise questions regarding the rationale behind current treatments aimed at modifying the mechanics of the medial longitudinal arch in heel pain.
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ROS, RENATO A. "Metodologia de controle de qualidade de equipamentos de raios x (nivel diagnostico) utilizados em calibracao de instrumentos." reponame:Repositório Institucional do IPEN, 2000. http://repositorio.ipen.br:8080/xmlui/handle/123456789/10803.
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Scarponi, Valentina. "Towards autonomous endovascular surgery : development of assistance tools for computer-aided interventions." Electronic Thesis or Diss., Strasbourg, 2024. http://www.theses.fr/2024STRAD051.
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Le traitement des maladies cardiovasculaires nécessite de naviguer des guides et des cathéters à travers l'anatomie vasculaire. Cette tâche peut être très complexe et entraîne souvent des procédures prolongées au cours desquelles le patient et le clinicien sont exposés aux radiations des rayons X.Pour remédier à cette limitation, ce manuscrit propose deux systèmes principaux : l'un qui améliore les images fluoroscopiques et l'autre qui navigue de manière autonome les instruments chirurgicaux. Le premier est essentiellement un système d'assistance, superposant les images fluoroscopiques classiques avec des informations sur l'anatomie et sur l'issue prévue des actions du clinicien avant leur réalisation. Le second est un contrôleur basé sur l'apprentissage profond par renforcement, conçu pour réaliser de manière autonome l'intervention en contrôlant un robot chirurgical endovasculaire. Actuellement, ces robots fonctionnent uniquement comme des dispositifs maître-esclave et ne sont pas capables de fournir un soutien supplémentaire au soignant pendant l'intervention.Lors de tests réalisés sur un fantôme dans le cadre d'une étude utilisateur, le système fluoroscopique amélioré a permis de réduire le temps d'intervention de 56 %. Le contrôleur autonome a atteint, dans un environnement simulé, un taux de réussite supérieur à 95 % sur des anatomies réalistes, même lorsqu'il a été testé sur des géométries présentant des caractéristiques complètement différentes de celles des modèles d'entraînement<br>The treatment of cardiovascular diseases requires navigating guidewires and catheters through the vascular anatomy. This task can be very challenging and often results in prolonged procedures where both the patient and clinician are exposed to X-ray radiation.To address this limitation, this manuscript proposes two main systems: one that enhances fluoroscopic images and another that autonomously navigates surgical tools. The first is essentially an assistance system, overlaying the classical fluoroscopic images with information about the anatomy and about the predicted outcome of clinician’s actions before they are performed. The second is a Deep Reinforcement Learning controller which aims to autonomously perform the procedure by controlling an endovascular surgical robot. Currently, these robots function only as leader-follower devices and are unable to provide additional support to the caregiver during the procedure.In tests conducted on a phantom in the context of a user study, the enhanced fluoroscopic system reduced intervention time by 56%. The autonomous controller achieved, in a simulated environment, a success rate of over 95% on realistic anatomies, even when tested on geometries with characteristics completely different from the training models
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Preliasco, Gabriel Rinaldo. "Motion control for a tracking fluoroscope system." 2005. http://etd.utk.edu/2005/PreliascoGabriel.pdf.
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Thesis (M.S.) -- University of Tennessee, Knoxville, 2005.<br>Title from title page screen (viewed on June 30, 2005). Thesis advisor: William R. Hamel. Document formatted into pages (xvii, 133 p. : ill. (some col.)). Vita. Includes bibliographical references (p. 122-123).
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Elgström, Henrik. "Assessment of image quality in x-ray fluoroscopy based on Model observers as an objective measure for quality control and image optimization." Thesis, 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-158081.
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BACKGROUND: Although the Image Quality (IQ) indices calculated by objective Model observers contains more favourable characteristics compared to Figure Of Merits (FOM) derived from the more common subjective evaluations of modern digital diagnostic fluoroscopy units, like CDRAD or the Leeds test-objects, practical issues in form of limited access to unprocessed raw data and intricate laboratory measurements have made the conventional computational methods too inefficient and laborious. One approach of the Statistical Decision Variables (CDV) analysis, made available in the FluoroQuality software, overcome these limitations by calculating the SNR2rate from information entirely based on image frames directly obtained from the imaging system, operating in its usual clinical mode. AIM: The overall aim of the project has been to make the proposed Model observer methodology readily available and verified for use in common IQ tests that takes place in a hospital based on simple measuring procedures with the default image enhancement techniques turned on. This includes conversion of FluoroQuality to MATLAB, assessment of its applicability on a modern digital unit by means of comparisons of measured SNR2rate with the expected linear response predicted by the classical Rose model, assessment of the methods limiting and optimized imaging conditions (with regard to both equipment and software parameters) and dose-efficiency measurements of the SNR2rate/Doserate Dose-to-information (DI) index including both routine quality control of the detector and equipment parameter analyses. MATERIALS AND METHODS: A Siemens Axiom Artis Zee MP diagnostic fluoroscopy unit, a Diamentor transmission ionisation chamber and a small T20 solid state detector have been used for acquisition of image data and measurements of Air Kerma-area product rate (KAP-rate) and Entrance Surface Air Kerma rate (ESAK-rate without backscatter). Two sets of separate non-attached test-details, of aluminium and tissue equivalent materials respectively, and a Leeds test object were used as contrasting signals. Dose-efficiency measurements consisted of variation of 4 different parameters: Source-Object-Distance, Phantom PMMA thickness, Field size and Dose rate setting. In addition to these, dimensions of the test details as well as computational parameters of the software, like ROI size and number of frames, were included in the theoretical analyses. RESULTS: FluoroQuality has successfully been converted to MATLAB and the method has been verified with SNR2rate in accordance with the Rose model with only small deviations observed in contrast analyses, most likely reflecting the methods sensitivity in observing non-linear effects. Useful guidelines for measurement procedures with regard to accuracy and precision have been derived from the studies. Results from measurements of the (squared) DI-indices indicates comparable precision (≤ 8%) with the highest performing visual evaluations but with higher accuracy and reproducibility. What still remains for the method to compete with subjective routine QC tests is to integrate the SNR2rate measurements in an efficient enough QA program.
Books on the topic "Fluoroscopic control"
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Great Britain. Department of Health and Social Security. Supplies Technology Division., ed. Assessment of a Siemens Siregraph D remote control fluoroscopy / radiography package. Department of Healthand Social Security, NHS Procurement Directorate, Supplies Technology Division, 1987.
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Siegenthaler, Andreas. Cervical Facet Nerve Block: Ultrasound. Oxford University Press, 2016. http://dx.doi.org/10.1093/med/9780199908004.003.0008.
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The cervical facet joints are well-documented sources of chronic neck pain and headache. Ultrasound may offer the advantage of visualizing the actual target nerves, which is not possible with fluoroscopy. The relevant structures are located much more superficially than in the lumbar spine, hence visibility of the potential targets with ultrasound is expected to be better than in the lumbar region. Besides the ability to perform diagnostic nerve blocks, ultrasound imaging is expected to increase precision of radiofrequency neurotomy due to the ability to localize the exact course of a facet joint supplying nerve. For practitioners with only little experience in cervical sonoanatomy, we recommend performing ultrasound-guided cervical medial branch blocks with parallel fluoroscopic control first till one gains more experience. Correct level determination with ultrasound as described may be difficult for beginners, and the parallel use of fluoroscopy will help developing a “feel” for the procedure.
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Kapural, Leonardo. Lumbar Disc Procedures: Fluoroscopy. Oxford University Press, 2016. http://dx.doi.org/10.1093/med/9780199908004.003.0023.
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Discogenic lumbar pain is a frequent cause of prolonged disability. Currently, there are few effective minimally invasive therapeutic options to treat diseased discs and provide a long-term pain relief. Intradiscal biacuplasty improves functional capacity and affords pain relief in properly selected patients. Provocative discography is a relatively invasive intradiscal technique that has been used as a diagnostic tool to help to detect painful discs and associated morphological changes. One of the effective therapeutic approaches to control discogenic pain is to use an ablative radiofrequency intradiscal procedure, like biacuplasty. Intradiscal electrothermal therapy (IDET) is currently in limited use. Serious complications of intradiscal procedures are rather rare.
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Maani, Christopher V., and LT Col Edward M. Lopez. Pain Management Procedures. Oxford University Press, 2018. http://dx.doi.org/10.1093/med/9780190495756.003.0030.
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Patients referred to pain clinics are often those with the most severe pain, who have failed more conservative approaches or strictly medical modalities. In other instances, the patients are referred for concerns of comorbidities or lack of pain management resources such as a clinic and procedure room with fluoroscopic capabilities. While the goal for these percutaneous interventions is improved pain control, they should be considered adjuncts and not replacements for a comprehensive pain management strategy. Most patients benefit from multimodal pain medication strategies, physical therapy, stress management and relaxation training, occupational therapy, acupuncture, or other treatment therapies. This chapter provides an overview and discussion of several of the most common pain procedures encountered in clinical pain management practices today. Each procedure is discussed with an initial description of the strategy, including technical aspects, medical indications, and relevant complications important for the pain management physician to understand. This will be followed by a section on considerations for anesthetic management.
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Williams, Jerry R. Diagnostic radiology equipment. Oxford University Press, 2015. http://dx.doi.org/10.1093/med/9780199655212.003.0012.
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The chapter is concerned with the features of radiographic and fluoroscopic equipment that present radiation protection issues for both patients and staff. These are managed through regulation, manufacturing standards, and adherence to safe working practices. It is different for patients who are deliberately irradiated in accordance with justification protocols not considered here. Radiation protection is based on the ALARP principle which requires the resultant dose to be minimized consistent with image quality is sufficient to provide accurate and safe diagnosis. Dose minimization is critically dependent on detector efficiency. Quality control of dose for individual examinations is particularly important to provide assurance of ALARP. It should include not only patient dose assessment but also detector dose indicators, particularly in radiography. These issues are discussed in detail together with other dose-saving features and discussion on objective methods of image quality assessment. Commissioning and lifetime tests are required for quality assurance programmes. These are described.
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Vallejo, Ricardo, and Ramsin Benyamin. Vertebral Augmentation: Fluoroscopy and CT. Oxford University Press, 2016. http://dx.doi.org/10.1093/med/9780199908004.003.0026.
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Osteoporosis, an age-related condition, is becoming a major public health problem. Vertebral compression fractures (VCFs) constitute the most frequent complication of osteoporosis. The pain and immobility caused by osteoporotic VCFs are linked to significant morbidities and impaired quality of life. Percutaneous techniques such as vertebroplasty and vertebral augmentation have emerged as viable treatments for acutely painful VCFs over the last several decades. Vertebroplasty (PV) and balloon kyphoplasty (KP) are minimally invasive vertebral augmentation procedures involving injection of polymethylmethacrylate cement under radiologic control into a fractured vertebral body. Vertebroplasty appears to offer a comparable rate of postoperative pain relief as kyphoplasty while using less bone cement, more often via a unilateral approach and without the attendant risk of adjacent level fracture.
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Kastler, Bruno, and Adrian Kastler. Lumbar Sympathetic Block and Neurolysis: Computed Tomography. Oxford University Press, 2016. http://dx.doi.org/10.1093/med/9780199908004.003.0031.
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Lumbar sympathetic block and neurolysis are accepted treatment procedures in patients with sympathetic mediated lower limb pain and patients with advanced peripheral arterial disease. The use of imaging guidance is highly recommended in order to achieve best possible results and to avoid complications. The high image resolution (as opposed to fluoroscopy) and high availability (as opposed to MRI) offered by CT makes it the imaging guidance technique preferred. This chapter reviews the indications of lumbar sympathetic chain blockade and neurolysis and the basic anatomical background. Then it demonstrates how CT guidance allows a step-by-step control of positioning the needle tip at the target for either lumbar blockade or alcohol neurolysis and the advantages and disadvantages of each technique are summarized.
Book chapters on the topic "Fluoroscopic control"
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Bernardo, Norberto O., and Maximiliano Lopez Silva. "Percutaneous Nephrolithotomy Access Under Fluoroscopic Control." In Smith's Textbook of Endourology. John Wiley & Sons, Ltd, 2018. http://dx.doi.org/10.1002/9781119245193.ch13.
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Bernardo, Norberto O. "Percutaneous Renal Access Under Fluoroscopic Control." In Smith's Textbook of Endourology. Wiley-Blackwell, 2012. http://dx.doi.org/10.1002/9781444345148.ch13.
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Silva, Maximiliano Lopez, Pablo Contreras, and Norberto O. Bernardo. "Percutaneous Nephrolithotomy Access Under Fluoroscopic Control (Prone and Supine)." In Percutaneous Renal Surgery. Springer International Publishing, 2023. http://dx.doi.org/10.1007/978-3-031-40542-6_9.
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Suliman, Ibrahim Idris, R. T. M. van Soldt, and J. Zoetelief. "Digital fluoroscopy quality control measurements." In World Congress on Medical Physics and Biomedical Engineering 2006. Springer Berlin Heidelberg, 2007. http://dx.doi.org/10.1007/978-3-540-36841-0_361.
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Turko, Ensar. "Interventional Radiology in Hepatobiliary Cancers." In The Radiology of Cancer. Nobel Tip Kitabevleri, 2024. http://dx.doi.org/10.69860/nobel.9786053359364.35.
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Hepatobiliary cancers, including liver and bile duct malignancies, present significant global health challenges. Imaging modalities such as MRI and CT are pivotal for diagnosis, while percutaneous transhepatic cholangiography (PTC) aids in both diagnosis and treatment guidance under fluoroscopic control. Interventional radiology (IR) plays a crucial role in hepatobiliary cancers across diagnostic, palliative, and therapeutic domains. Diagnostic Interventional Radiology: In IR diagnostics, imaging modalities like CT, MRI, and ultrasound are employed to characterize liver lesions and guide biopsies. Fine needle biopsy, utilizing a 21-25 gauge needle, offers rapid, cost-effective sampling with low complication rates. Core biopsy, using a 16-18 gauge tru-cut system, provides more detailed pathological information despite slightly higher risks. Percutaneous transhepatic cholangiography (PTC) assists in visualizing bile duct involvement and obtaining biopsies when endoscopic access is inadequate. Palliative Interventional Radiology: For palliation in obstructive jaundice from biliary obstructions (often due to malignancies), procedures aim to restore bile flow using endoscopic or percutaneous drainage. Biliary stenting may follow drainage, with self-expanding metallic stents preferred for durability and efficacy. These interventions improve quality of life by alleviating symptoms and preparing patients for further treatment. Therapeutic Interventional Radiology: Thermal ablation techniques like radiofrequency (RFA), microwave (MWA), and cryoablation (CrA) offer curative options for liver tumors ≤5 cm, sparing healthy tissue and minimizing complications. Transarterial chemoembolization (TACE) and transarterial radioembolization (TARE) target tumors via hepatic artery access, delivering chemotherapy or radiation internally to enhance efficacy and reduce systemic side effects. Conclusion: Interventional radiology serves as an essential adjunct to traditional oncological approaches in hepatobiliary cancers, offering diagnostic clarity, palliative relief, and curative treatment options. Advancements in IR techniques continue to expand therapeutic possibilities, improving outcomes and quality of life for patients worldwide.
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Iwase, Takumi, and Yuzuru Kouno. "Quality Control in X-Ray Fluoroscopy and Digital Tomography." In Respiratory Endoscopy. Springer Singapore, 2016. http://dx.doi.org/10.1007/978-981-287-916-5_5.
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He, Rui, Hao Wen, Changsheng Li, et al. "Development and Control of a CT Fluoroscopy Guided Lung Puncture Robot." In Intelligent Robotics and Applications. Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-89134-3_6.
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Parelli, Robert J. "Fluoroscopy Quality Assurance and Quality Control Program." In Principles of Fluoroscopic Image Intensification and Television Systems. CRC Press, 2020. http://dx.doi.org/10.4324/9781003072980-16.
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Parelli, Robert J. "California Radiation Control Regulations: Responsibility of the Supervisor and Operator." In Principles of Fluoroscopic Image Intensification and Television Systems. CRC Press, 2020. http://dx.doi.org/10.4324/9781003072980-14.
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Potere, Bethany, Nasir Hussain, Timothy Deer, and Alaa Abd-Elsayed. "Percutaneous Spinal Cord Stimulator Trial." In Minimally Invasive Surgical Procedures for Pain, edited by Dawood Sayed, Alaa Abd-Elsayed, Steven Falowski, and Timothy Deer. Oxford University PressNew York, 2024. http://dx.doi.org/10.1093/med/9780197616734.003.0018.
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Abstract Spinal cord stimulation (SCS) is an emerging treatment for chronic pain patients who have failed conservative therapies. SCS applies the gate control theory to modulate pain signals in the dorsal spinal cord. SCS is best used for patients with persistent back pain, chronic regional pain syndrome, and limb ischemia, in whom it has been demonstrated to lead to improved pain control and improvement in quality of life. Prior to permanent stimulator implantation, a trial is performed under fluoroscopic guidance. This chapter highlights the indications, procedure, evidence, and postoperative management of patients undergoing spinal cord stimulator trial placement.
Conference papers on the topic "Fluoroscopic control"
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Burgner, Jessica, S. Duke Herrell, and Robert J. Webster. "Toward Fluoroscopic Shape Reconstruction for Control of Steerable Medical Devices." In ASME 2011 Dynamic Systems and Control Conference and Bath/ASME Symposium on Fluid Power and Motion Control. ASMEDC, 2011. http://dx.doi.org/10.1115/dscc2011-6029.
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Control of surgical continuum robot manipulators and steerable needles requires accurate real-time sensing of tip position and/or shaft shape. Medical image feedback provides the most straightforward and widely available method of measuring device and clinical target positions and shapes during insertion or tissue manipulation. In this paper we present a method for automatic robot/needle curve segmentation from fluoroscopic images, as well as a method for 3D reconstruction of the curve using biplane fluoroscopy images.
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Tache, Irina Andra. "Statistical Evaluation of Velocity Estimations from Temporal Fluoroscopic Angiography." In 2022 IEEE 20th International Power Electronics and Motion Control Conference (PEMC). IEEE, 2022. http://dx.doi.org/10.1109/pemc51159.2022.9962898.
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Ravigopal, Sharan R., Timothy A. Brumfiel, and Jaydev P. Desai. "Automated Motion Control of the COAST Robotic Guidewire under Fluoroscopic Guidance." In 2021 International Symposium on Medical Robotics (ISMR). IEEE, 2021. http://dx.doi.org/10.1109/ismr48346.2021.9661508.
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Oh, Jinsik, Jong-Oh Park, Sukho Park, and Seong Young Ko. "Image-based guidance system for intravascular microrobot: Fiducial marker-based registration using biplanar fluoroscopic images & CTA images." In 2015 15th International Conference on Control, Automation and Systems (ICCAS). IEEE, 2015. http://dx.doi.org/10.1109/iccas.2015.7364753.
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Ravigopal, Sharan R., Kirsten M. Williams, and Jaydev P. Desai. "Towards Closed-loop Control of the Modified COAST Guidewire under Fluoroscopic Imaging for Endotracheal and Endovascular Interventions." In 2023 International Symposium on Medical Robotics (ISMR). IEEE, 2023. http://dx.doi.org/10.1109/ismr57123.2023.10130202.
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Dong, Xiao, and Guoyan Zheng. "Determining Geometrical Parameters by Particle Filter for Automatic Reconstruction of Surface Model of Proximal Femur from Biplanar Calibrated Fluoroscopic Images." In 2006 9th International Conference on Control, Automation, Robotics and Vision. IEEE, 2006. http://dx.doi.org/10.1109/icarcv.2006.345330.
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Yang, Chang-Ying J., Stephen Rudin, and Daniel R. Bednarek. "Variable sampling area for automatic brightness control in digital fluoroscopy." In Medical Imaging '99, edited by John M. Boone and James T. Dobbins III. SPIE, 1999. http://dx.doi.org/10.1117/12.349563.
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Forsberg, Mark A., David J. Eschelman, Prakruti Talreja, and Jaydev K. Dave. "Do quantitative metrics derived from standard fluoroscopy phantoms used for quality control assess vendor-specific advancements in interventional fluoroscopy systems?" In SPIE Medical Imaging, edited by Matthew A. Kupinski and Robert M. Nishikawa. SPIE, 2017. http://dx.doi.org/10.1117/12.2254561.
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Kim, Kim, Èric Lluch, Gulsun Mehmet, Florin Ghesu, and Ankur Kapoor. "AI-based Agents for Automated Robotic Endovascular Guidewire Manipulation." In THE HAMLYN SYMPOSIUM ON MEDICAL ROBOTICS. The Hamlyn Centre, Imperial College London London, UK, 2023. http://dx.doi.org/10.31256/hsmr2023.67.
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An endovascular guidewire manipulation is essential for minimally-invasive clinical applications; Percutaneous Coronary Intervention (PCI) is used to open narrowed coronary arteries and restore arterial blood flow to heart tissue, Mechanical thrombectomy techniques for acute ischemic stroke (AIS) to remove blood clots from the brain veins, and Transjugular intrahepatic portosystemic shunt (TIPS) for liver portal hypertension use a special needle and position a wire between the portal vein through the liver. All procedures commonly require 3D vessel geometries from 3D CTA (Computed Tomography Angiography) images (Fig. 1). During these procedures, the clinician generally places a guiding catheter in the ostium of the relevant vessel and then manipulates a wire through the catheter and across the blockage. The clinician only uses X-ray fluoroscopy intermittently to visualize and guide the catheter, guidewire, and other devices (e.g., angioplasty balloons and stents). Various types of endovascular robot-assisted systems [1, 2] are being developed to provide efficient positional control of devices, helping clinicians to mitigate therapeutical risks. The primary motions that a clinician can use to control the movement and direction of the wire are rotation and pushing/retracting from the proximal end of the wire outside the insertion point on the patient’s body. Even with these robotic devices, clinicians passively control guidewires/catheters by relying on limited indirect obser- vation (i.e., 2D partial view of devices, and intermittent updates due to radiation limit) from X-ray fluoroscopy. Modeling and controlling the guidewire manipulation in coronary vessels remains challenging because of the complicated interaction between guidewire motions with different physical properties (i.e., loads, coating) and vessel geometries with lumen conditions resulting in a highly non- linear system.
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Ashammagari, Aditya Reddy, Naveen Kumar Sankaran, Pramod Chembrammel, et al. "Image Guided Automation of Endovascular Robotic Surgery." In ASME 2016 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2016. http://dx.doi.org/10.1115/imece2016-65922.
Full textAbstract:
Interventional cardiologists and neurosurgeons are exposed to X-ray radiations while performing surgery. A few tele-robotic systems currently in the market require tedious tele-control using an external input device. In this paper we propose to automate such interventional surgeries using a robotic system using image guided intervention. After image processing of x-ray fluoroscope image and applying new machine learning techniques based on Markov Decision process, our new robotic system is capable of reaching aortic arch, which is the first step in cardiac and neuro-interventional procedures. Further, we explain the algorithm and demonstrate the proposed system implementation on an endovascular simulator.
Reports on the topic "Fluoroscopic control"
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Lin, Pei-Jan Paul, Phillip Rauch, Stephen Balter, et al. Functionality and Operation of Fluoroscopic Automatic Brightness Control/Automatic Dose Rate Control Logic in Modern Cardiovascular and Interventional Angiography Systems. AAPM, 2012. http://dx.doi.org/10.37206/116.
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