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Academic literature on the topic 'CT (Computed Tomography); CTDI (Computed Tomography Dose Index); Phantom'
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Journal articles on the topic "CT (Computed Tomography); CTDI (Computed Tomography Dose Index); Phantom"
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Akter, Shirin, Rajada Khatun, S. M. Enamul Kabir, et al. "Dosimetric Verification of Computed Tomography (CT) Systems Using CTDI Phantom." Bangladesh Journal of Nuclear Medicine 26, no. 2 (2024): 172–76. http://dx.doi.org/10.3329/bjnm.v26i2.71488.
Full textAbstract:
Background: Computed tomography (CT) is a medical imaging modality that contributes widely over the world for the diagnosis of disease and for treatment planning in the radiotherapy department. The purpose of the study is to measure the accuracy of dose of CT System for quality treatment. Materials and Methods: The study was executed in a 16 slice SOMATOM Emotion CT Scanner of Delta Hospital Ltd. with Tube voltage 130 KV and Tube current 25 mA using Computed Tomography Dose Index (CTDI) phantom (CIRS) of MPD, Atomic Energy Centre, Dhaka. IBA pencil ionization chamber was used to measure the dose at different positions inside the CTDI phantom and data were collected using IBA MagicMax Universal software. The CT radiation doses were estimated using formalisms in the AAPM Report 96 and 111. Results: For the Adult Body Phantom Console displayed dose was 16.03 mGy and estimated dose was found as16.40 mGy. For the Adult Head Phantom, console displayed dose was 32.40 mGy and estimated dose was found as 34.60 mGy. Between the estimated and console displayed doses for Adult Body Phantom and Adult Head Phantom a deviation was realized of 2.3% and 6.8% respectively. Conclusion: Hence CTDI of the above mentioned machine comply with reference value within a tolerance of ± 20 % according to Food and Drug Administration (FDA). Bangladesh J. Nuclear Med. 26(2): 172-176, 2023
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Kamila, Kamila, Nurbaiti Nurbaiti, Wahyu Hidayat, et al. "Analisis Hubungan Nilai Noise Citra dan Computed Tomography Dose Index (CTDI) Pada Variasi Pitch Protokol CT Abdomen Rutin di RSUD Koja Jakarta Utara." Jurnal Pengawasan Tenaga Nuklir 4, no. 2 (2024): 81–86. https://doi.org/10.53862/jupeten.v4i2.012.
Full textAbstract:
Computed Tomography (CT) has become one of the primary diagnostic methods in modern medicine, allowing detailed and accurate visualization of the internal structures of the human body. In its use, the pitch value can affect the radiation dose received by the patient and the quality of the resulting image. This study aims to analyze the effect of pitch variations on the Computed Tomography Dose Index (CTDI) and image noise in Routine Abdominal CT to achieve the best image quality with minimal patient dose. This research method uses a quantitative design using a 32 cm diameter PMMA water phantom as a model. Eight pitch variations (0.40, 0.55, 0.60, 0.80, 0.90, 1.00, 1.35, and 1.50) were evaluated using a Siemens Somatom Perspective 128 Slice CT-Scan. Data were collected through experiments on the water phantom and analyzed using descriptive analysis, normality tests, and correlation tests. The results showed no significant relationship between CTDI values and image noise with pitch variations. Increasing the pitch value contributed to increasing CTDI but decreased image noise. These results indicate that a pitch of 0.60 has an optimal image noise value and minimal CTDI in the Routine CT Abdomen protocol at RSUD Koja, North Jakarta. This study provides a deeper understanding of the importance of selecting the correct pitch value in minimizing patient radiation dose while maintaining good image quality. The practical implication is using a pitch of 0.60 as the optimal value for the Routine CT Abdomen protocol, which can reduce the risk of excessive radiation exposure to patients. Keywords: CT-Scan, pitch, water phantom, CT Abdomen, noise, computed tomography dose index (CTDI)
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Adrien, C., C. Le Loirec, S. Dreuil, and J. M. Bordy. "A new Monte Carlo tool for organ dose estimation in computed tomography." Radioprotection 55, no. 2 (2020): 123–34. http://dx.doi.org/10.1051/radiopro/2020006.
Full textAbstract:
The constant increase of computed tomography (CT) exams and their major contribution to the collective dose led to international concerns regarding patient dose in CT imaging. Efforts were made to manage radiation dose in CT, mostly with the use of the CT dose index (CTDI). However CTDI does not give access to organ dose information, while Monte Carlo (MC) simulation can provide it if detailed information of the patient anatomy and the source are available. In this work, the X-ray source and the geometry of the GE VCT Lightspeed 64 were modelled, based both on the manufacturer technical note and some experimental data. Simulated dose values were compared with measurements performed in homogeneous conditions with a pencil chamber and then in CIRS ATOM anthropomorphic phantom using both optically stimulated luminescence dosimeters (OSLD) for point doses and XR-QA Gafchromic® films for relative dose maps. Organ doses were ultimately estimated in the ICRP 110 numerical female phantom and compared to data reported in the literature. Comparison of measured and simulated values show that our tool can be used for a patient specific and organ dose oriented radiation protection tool in CT medical imaging.
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Lu, Heqing, Xiangqun Ye, Haowei Zhang, and Si Sun. "STUDY ON A SPECIFIC TEST METHOD FOR DOSIMETRIC CHARACTERIZATION OF ULTRA-WIDE DETECTOR COMPUTED TOMOGRAPHY." Radiation Protection Dosimetry 193, no. 1 (2021): 55–65. http://dx.doi.org/10.1093/rpd/ncab021.
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Abstract The purpose of this study was to establish a specific test method for dosimetric characterization of wide-beam computed tomography (CT). For a wide beam, the dose distribution curve and the area of the curve were obtained by using pencil-like ionization chamber, a long CT dose profiler probe, a head phantom and a body phantom. The absolute dose conversion coefficient was multiplied to obtain the total integration integral of the absolute dose distribution, and then the computed tomography dose index (CTDI) value under any wide beam condition was obtained by dividing the collimation width. It was calculated that the absolute dose conversion coefficient was 1.135 under the narrow beam of 8 mm. To a 160 mm-wide beam, the value of CTDI was 7.57 mGy/100mAs after normalized in the head 80 kV CT scanning, and it was 9.80 mGy/100mAs after normalized in the body 120 kV CT scanning. The specific test method solves the problem that the previous measurement method underestimates the CTDI value.
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Mhagama, Allen Nathan. "Is there Correlation between Measured and Console CTDIvol in Multislice CT Scanners?" Journal of Physical Chemistry & Biophysics 12, no. 4 (2022): 8. https://doi.org/10.5281/zenodo.14604365.
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This study investigated the relationship between measured and console volume computed tomography dose index (CTDIvol) in multislice CT scanners. The measured CTDI values were determined from kerma length product measured using pencil ionization chamber inserted in the holes of standard CT phantoms with diameters 16 and 32 cm, which respectively mimic adult head and body using the procedures recommended by International Electro-technical Commission. Significantly large deviations were observed between the measured and console CTDIvol values in multislice CT scanners.
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Utami, Moh Shofi Nur, Nur Asni, Freddy Haryanto, Muharam Budi Laksono, Anggun Yusifa, and Nermina Nermina. "Comparison of CTDIw and Homogeneity Index on CTDI Phantoms." Jurnal Fisika 13, no. 2 (2023): 85–91. http://dx.doi.org/10.15294/jf.v13i2.48397.
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The study was conducted to compare the Computed Tomography Dose Index Weighted (CTDIw) value values and homogeneity index on head and body phantoms with tube voltage variations. Two CTDI phantoms are Gammex (Sun Nuclear, Florida, United States) and IBA (IBA Dosimetry, Schwarzenbruck, Germany). The pencil ionization chamber was used for the measurement of CTDI. The measurements were carried out with a Toshiba Alexion 16 MSCT in a single rotation of axial mode with detector position in the phantom’s center, top, bottom, right, and left. Tube voltage values are 80 kVp, 100 kVp, and 120 kVp. Then, the homogeneity test of the phantom was carried out. The homogeneity value was obtained by measuring the average CT number in the image by determining the region of interest (ROI) at positions namely a, b, c, d, and e, In addition the ratio of the two phantoms was also carried out. The ratio was obtained from the difference of the CTDI100 value at the edge to the CTDI100 value at the center of the head and body phantom from Gammex and IBA. The results showed that the CTDIwof the Gammex head phantom are 26.83 mGy (80 kV), 53.32 mGy (100 kV) and 83.32 mGy (120 kV). While the CTDIw of the Gammex body phantom are 11.73 mGy (80 kV), 21.58 mGy (100 kV) and 36.45 mGy (120 kV). In comparison, CTDIw of the IBA head phantom are 27.01 mGy (80 kV), 55.33 mGy (100 kV) and 81.69 mGy (120 kV). While the CTDIw of the IBA body phantom are 11.85 mGy (80 kV), 23.32 mGy (100 kV) and 35.00 mGy (120 kV). The differences in CTDIw of the two phantoms were within (head phantom is 0.18 % – 2.01 %) and (body phantom is 0.13 % – 1.75 %). The difference below 5% with the p-value of the head phantom is 0.87 and body phantom is 0.89 (more than 0.05) indicates that the two phantoms are not significantly different because the two phantoms are made of the same material. The average ratio for the Gammex head phantom is 1.12 – 1.28, while the IBA head phantom is 1.07 – 1.28. Then the average ratio for the Gammex body phantom is 2.03 – 2.56, while for the IBA body phantom is 1.91 – 2.59 which indicates that the head phantom produces a more uniform dose distribution compared to a body phantom. The average homogeneity value of the IBA phantom is 90.52 % and the average homogeneity value of the Gammex phantom is 87.15 % (a difference of around 3.37%). This value shows that Gammex and IBA phantom have fairly good homogeneity
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Nurhayati, Arry Y., Nia N. Nariswari, B. Rahayuningsih, and Yuda C. Hariadi. "Analisis Variasi Faktor Eksposi dan Ketebalan Irisan Terhadap CTDI dan Kualitas Citra Pada Computed Tomography Scan." BERKALA SAINSTEK 7, no. 1 (2019): 7. http://dx.doi.org/10.19184/bst.v7i1.9913.
Full textAbstract:
CT Scan merupakan alat pencitraan sinar-X yang dipadukan dengan komputer pengolah data sehingga mampu menghasilkan gambar potongan melintang tubuh dan memiliki dosis relatif lebih tinggi, karena berasal dari radiasi primer dan radiasi hambur dari setiap slice. Dosis yang dihasilkan dipengaruhi oleh parameter scan yaitu faktor eksposi (tegangan tabung, arus- waktu rotasi) dan ketebalan irisan. Kuantitas dosis pada pemeriksaan CT Scan digunakan metode Computed Tomography Dose Index (CTDI). Penelitian ini dilakukan untuk mengatahui efek variasi parameter scan terhadap CTDI dan kualitas citra dengan menggunakan phantom. Hasil data yang diperoleh menunjukkan bahwa pada variasi 200 mAs, 120 kV dan 5 mm menghasilkan CTDIvol dan CNR optimum dengan nilai masing-masing 25.8 mGy dan 3.51. Hal ini disebabkan adanya keseimbangan nilai antara faktor eksposi yang tidak memiliki rentang yang terlalu jauh sehingga menghasilkan energi dan kuantitas sinar X yang seimbang dan ketebalan irisan tidak menghasilkan noise tinggi sehingga objek dalam phantom tetap dapat terlihat lebih baik. Kata Kunci: CT Scan, CTDI, CTDIvol, LCR, CNR.
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Ilham, Ilham, Sri Zelviani, Jumardin Jumardin, and Khaerul Bariah. "ANALISIS NILAI COMPUTED TOMOGRAPHY DOSE INDEX (CTDI) PADA PHANTOM KEPALA DI INSTALASI RADIOLOGI RUMAH SAKIT UMUM DAERAH SAYANG RAKYAT MAKASSAR." JOURNAL ONLINE OF PHYSICS 10, no. 1 (2024): 55–61. https://doi.org/10.22437/jop.v10i1.37149.
Full textAbstract:
This research aims to determine the CTDI value on a CT Scan aircraft using Dose Profiler and to determine the comparison of the CTDI (Computed Tomography Dose Index) value on the surface of each measurement position. The measurement method was carried out by measuring the CT Scan radiation dose with the CTDI value on the phantom using a RaySafe multimeter at a voltage of 130 kV, using a thickness of 10 mm, a time current accuracy of 100 mAs, 200 mAs and 300 mAs. The research results show the dose received on the surface of each type of phantom position with different time current accuracy respectively for a time current of 100 mAs at the center (9.139 mGy), type 1 (9.606 mGy), type 2 (9.170) type 3 (9.221) , and type 4 (9,210). A time current of 200 mAs is found at the center (9,110 mGy), edge 1 (9,578 mGy), edge 2 (9,546 mGy), edge 3 (9,224 mGy), and edge 4 (9,200 mGy). A time current of 300 mAs is found at the center position (18.39 mGy), edge 1 (19.33 mGy), edge 2 (19.18 mGy), edge 3 (18.48 mGy), and 4 (18.51 mGy) . Time-current variations affect the radiation dose that can be received by the phantom and have a linear influence on the CTDIvol value.
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Choudhary, Neha, Bhupendra Singh Rana, Arvind Shukla, Arun Singh Oinam, Narinder Paul Singh, and Sanjeev Kumar. "PATIENTS DOSE ESTIMATION IN CT EXAMINATIONS USING SIZE SPECIFIC DOSE ESTIMATES." Radiation Protection Dosimetry 184, no. 2 (2018): 256–62. http://dx.doi.org/10.1093/rpd/ncy207.
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Abstract The present work reports data of radiation exposure to the patients during head, chest, pelvis and abdomen CT examinations performed on a third-generation 16-slice CT machine. Radiation exposure was estimated using size specific dose estimates (SSDE) method, which takes into account patient’s physical dimensions in phantom measured computed tomography dose index (CTDI) value. The reported median CT dose volume index CTDIvol values in head, chest, pelvis and abdomen examinations were 26.76, 16.27, 29.81 and 14.74 mGy, respectively. The median doses evaluated using SSDE methodology for the above mentioned procedure were 54.1, 23.1, 42.8 and 20.1 mGy, respectively. Our results showed variation in dose values estimated using CTDI and SSDE methods in all examinations. The evaluated SSDE values were also compared to the values derived from data reported by the American Association of Physicist in Medicine (AAPM). SSDE values in present measurements are 4–8% lower than AAPM values. The present results show that CTDI parameters recorded on CT console should not be used to specify patient dose during CT procedures.
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Aabid, M., S. Semghouli, and A. Choukri. "Assessment of Computed Tomography Dose Index (CTDI) During CT Pelvimetry Using Monte Carlo Simulation." Atom Indonesia 1, no. 1 (2023): 21–25. http://dx.doi.org/10.55981/aij.2023.1214.
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A pelvimetry examination is sometimes prescribed to a pregnant woman at the end of her pregnancy in order to assess the dimensions of her pelvis prior to childbirth. This examination has long been performed by using X-ray, but is now increasingly being replaced by CT-scan The objective of this study is to assess the radiation doses received during a practical CT pelvimetry examination performed using a Hitashi Supria 16-slice CT scanner. The radiation doses were estimated using Monte Carlo (MC)-based simulation with GATE code to model the 16-slice CT scanner machine. The GATE code operates using GEANT4 libraries. A polyymethyl metacrylate (PMMA) acrylic phantom of 32 cm diameter was modeled to represent the patient's body. X-ray energy spectrum generated using the SRS-78 spectrum processor was used for simulation. The simulation was executed with the same exposure parameters as the practical CT pelvimetry examination with dose parameters of 1 mGy, 0.9 mGy, and 36.6 mGy.cm, respectively, for the weighted CT dose index (CTDIw), the volume CT dose index (CTDIvol), and dose-length product (DLP). The MC simulation results provide dose parameters of 1.16 mGy, 1.07 mGy, and 43.6 mGy.cm, respectively, for the CTDIw, CTDIvol, and DLP. The differences between the simulation and the practical examination were 16 %, 18 %, and 18 %, respectively. These differences are considered in a quite good agreement. The results were also consistent with other similar studies. This work proves that the Monte Carlo simulation with the GATE code is usable to assess the patient doses during a CT pelvimetry examination.
Books on the topic "CT (Computed Tomography); CTDI (Computed Tomography Dose Index); Phantom"
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McLean, Donald, and Claire-Louise Chapple. CT dosimetry. Oxford University Press, 2015. http://dx.doi.org/10.1093/med/9780199655212.003.0015.
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The computed tomography (CT) medical examination is the highest single source of radiation to the general public in the developed world. Its use is rapidly growing, as is its technical complexity. The primary dosimetry formalism is based on the computed tomography dose index (CTDI), which can be measured in air or in standard phantoms using a calibrated pencil ionization chamber with adaptations for wide beam scanners. Displayed dose parameters can be used with caution to estimate patient organ doses, effective dose, and risk, using a variety of models and software. An understanding of automatic exposure control and the influence of patient size is essential when interpreting dosimetry results. CT examination protocols require optimisation, including the appropriate use of newly available dose reduction features. Particular consideration needs to be given to paediatric CT and to specialist applications such as radiotherapy planning, cardiac CT and volume imaging.