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Dissertations / Theses on the topic 'Cone beam computerized tomography'

Author: Grafiati

Published: 4 June 2021

Last updated: 26 July 2025

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1

Saddy, Mario Sergio. "\"Estudo comparativo entre a tomografia computadorizada e a tomografia volumétrica na confecção de modelos de prototipagem\"." Universidade de São Paulo, 2006. http://www.teses.usp.br/teses/disponiveis/23/23139/tde-22032007-120737/.

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O objetivo neste estudo foi comparar modelos de prototipagem, originados a partir de dados obtidos em exames de tomografia volumétrica (TV) e tomografia computadorizada (TC), a fim de verificar a precisão de reprodutibilidade destas tecnologias. Uma mandíbula seca foi submetida aos exames de TV (NewTom 9000? QR, Itália) e TC (Select SP-Elscint, Israel). Os dados obtidos nos exames foram manipulados em dois sistemas de tratamento de imagem, o 3D- Analyze (Mayo Clinic, E.U.A.) e o InVesalius (CenPRA, Brasil) e confeccionados protótipos, em duas diferentes tecnologias (SLS - sinterização seletiva

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2

Hardison, Justin. "ACCURACY OF CONE-BEAM COMPUTERIZED TOMOGRAPHY IN DETERMINING THE THICKNESS OF THE PALATAL MASTICATORY MUCOSA." VCU Scholars Compass, 2012. http://scholarscompass.vcu.edu/etd/2691.

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BACKGROUND: The aim was to compare the thickness of the palatal masticatory mucosa as determined on a cone-beam computerized (CBCT) scan versus thickness determined via bone-sounding. METHODS: A total of twenty patients requiring palatal surgery participated. Thickness of the palatal tissue was measured at various points radiographically and clinically. The two techniques were compared to determine the agreement of the two measurement modalities. RESULTS: Analysis of variance determined that there was no significant difference between the two methods. A small bias of the radiographic measureme

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Guijarro, Martínez Raquel. "Cone-beam computerized tomography (CBCT) evaluation of the upper airway in the context of orthognathic surgery." Doctoral thesis, Universitat Internacional de Catalunya, 2014. http://hdl.handle.net/10803/134767.

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Upper airway analysis has become a key focus of investigation in the fields of Orthognathic Surgery and Orthodontics. This is due to the well-acknowledged relationship between a narrow upper airway and sleep-disordered breathing, and to the association between airway configuration and specific craniofacial phenotypes. As a result of the advancement of the skeletal insertions of the suprahyoid and velopharyngeal muscles, maxillomandibular advancement with counterclockwise rotation has established itself as an effective strategy to increase the pharyngeal airway volume, with subsequent improveme

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4

Langan, Thomas Anthony. "Retrospective cone beam computerized tomography study of the infraorbital foramen in relation to the maxillary sinus." Master's thesis, Temple University Libraries, 2016. http://cdm16002.contentdm.oclc.org/cdm/ref/collection/p245801coll10/id/375249.

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Oral Biology<br>M.S.<br>Objectives: As cone beam computerized tomography is used more widely for initial data collection and treatment planning, more valuable anatomic information is at the disposal of clinicians. The scans provide a very accurate display of the patient’s anatomy and these beneficial findings can be used to prevent surgical complications as well as advancing anatomical knowledge. This study aims to expand the current knowledge on the location of the infraorbital nerve in relation to the maxillary sinus in a group of patients who had CBCT scans taken for diagnosis and treatment

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5

Patel, Neepa. "A cone-beam computerized tomography evaluation of anterior root resorption comparing SureSmile® and conventional edgewise treatments." Oklahoma City : [s.n.], 2009.

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6

Paredes, de Sousa Gil Ariane. "CBCT (cone-beam computerized tomography) evaluation of the nasolabial soft tissue effects of Le Fort I maxillary osteotomy." Doctoral thesis, Universitat Internacional de Catalunya, 2019. http://hdl.handle.net/10803/667624.

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The aim of this study is to verify the soft tissues changes in the nasolabial area after Le Fort I osteotomy using a cone-beam computed tomography (CBCT) evaluation of three- dimensional (3D) volume surfaces in preoperative, early postoperative (1 month) and late postoperative (1 year) periods. Many authors have described the undesired soft tissue changes following the Le Fort I osteotomy, as well as many different techniques to prevent and control these changes. However, few studies have attempted to perform a 3D analysis of the nasolabial complex. The subsequent lack of standardized measuri

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7

Furchtgott, Natasha. "Transcutaneous Mandibular Nerve Blocks: Success Rate between Two Techniques and Comparative Evaluation of Local Anesthetic Distribution Using Cone Beam Computerized Tomography with Iodized Contrast." The Ohio State University, 2014. http://rave.ohiolink.edu/etdc/view?acc_num=osu1398943341.

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8

Almeida, Arací Malagodi de. "Expansão rápida e lenta da maxila em pacientes com fissura labiopalatina completa e bilateral: avaliação por meio da tomografia computadorizada cone-beam." Universidade de São Paulo, 2014. http://www.teses.usp.br/teses/disponiveis/61/61132/tde-13012015-115200/.

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Objetivo: O objetivo deste trabalho consistiu em avaliar e comparar os efeitos dentoesqueléticos dos expansores maxilares Haas/Hyrax e quadrihélice, em pacientes com fissura labiopalatina completa e bilateral. Material e Métodos: A amostra do estudo foi composta por 46 pacientes com fissura labiopalatina completa e bilateral, operados na infância, com atresia do arco dentário superior, na fase de dentadura mista tardia. Os pacientes foram aleatoriamente divididos em dois grupos de estudo, tratados com expansão rápida da maxila (ERM), com aparelhos ortopédicos Haas ou Hyrax (Grupo I, n=23) e co

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9

Cros, Torrents Maria. "Dose assessment in Computed Tomography based on Monte Carlo simulation for a 320 detector-row cone-beam scanner." Doctoral thesis, Universitat Rovira i Virgili, 2017. http://hdl.handle.net/10803/454717.

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La tomografia computaritzada (TC) ha esdevingut una de les tècniques d’imatge més utilitzades en el camp de radiodiagnòstic. Des de la introducció dels escàners TC multidetector, el ràpid procés d’evolució tecnològica ha permès l’ús de noves aplicacions diagnostiques. Per aquest motiu, és de gran importància l’avaluació d’exposició de radiació en els escàners i protocols d’adquisició actuals amb l’objectiu d’optimitzar l’aplicació clínica del TC i de minimitzar els possibles efectes de la radiació per la salut. La motivació d’aquesta tesi fou el desenvolupament d’una eina de simulació basada e

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10

Ertl, Christina Miriam [Verfasser], Stephanie E. [Akademischer Betreuer] Combs, Stephanie E. [Gutachter] Combs, and Daniela [Gutachter] Pfeiffer. "Planning of Radiotherapy on Cone-Beam Computerized Tomography – Inter-Observer Contouring Variability and Hounsfield Unit Uncertainties / Christina Miriam Ertl ; Gutachter: Stephanie E. Combs, Daniela Pfeiffer ; Betreuer: Stephanie E. Combs." München : Universitätsbibliothek der TU München, 2019. http://d-nb.info/1181946697/34.

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11

Penna, Livia Maria Vieira Rodrigues. "Retratamento endodôntico: casuística e comparação de dois métodos de diagnóstico por imagem." Universidade de São Paulo, 2011. http://www.teses.usp.br/teses/disponiveis/25/25147/tde-16082011-091604/.

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O exame radiográfico é um componente de diagnóstico essencial no plano de tratamento de problemas de origem endodôntica. Apesar do desenvolvimento técnico-científico da endodontia, o número de retratamentos endodônticos continua elevado. Neste cenário, a tomografia computadorizada de feixe cônico (TCFC) é utilizada para se obter imagens tridimensionais sem distorções de estruturas pertencentes ao complexo dento-maxilo-facial e seus tecidos adjacentes. Frente aos fatos, este estudo teve como objetivos comparar a incidência de retratamento endodôntico nos anos de 1997, 2001 e 2007 de pacientes a

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12

Yogi, Helena Emiko Tunouti. "Morfologia craniofacial e sua associação com o comprometimento funcional em adolescentes com paralisia cerebral." Universidade de São Paulo, 2014. http://www.teses.usp.br/teses/disponiveis/23/23132/tde-28032014-191915/.

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Este estudo objetivou aprofundar o conhecimento sobre a morfologia óssea craniofacial de jovens com Paralisia Cerebral, e associá-la ao comprometimento funcional geral e a função motora orofacial. Utilizamos uma amostra pareada por gênero e idade, constituída de 21 adolescentes com Paralisia Cerebral (GE) com idade média de 14,7(2,6) anos para o gênero feminino e 13,9(2,8) anos para o gênero masculino, e 22 adolescentes normorreativos (GC) com idade média de 14,6(2,6) anos para o gênero feminino e 14,8 (3,8) anos para o gênero masculino. Foram realizadas análises das imagens obtidas por Tomogr

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Junes, Prado Luisa. "Utilización de CBCT en retratamiento endodóntico selectivo no quirúrgico." Master's thesis, Universidad Peruana de Ciencias Aplicadas (UPC), 2018. http://hdl.handle.net/10757/625916.

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El retratamiento de canales radiculares es una alternativa ante el fracaso endodóntico. Este procedimiento tiene como objetivo reducir los síntomas que pueden presentarse o agravarse posterior al tratamiento de endodoncia. El procedimiento del retratamiento de canales sigue la premisa que aparentemente la calidad del material de obturación en todo el sistema de canales es deficiente, por consiguiente, todo el material debe ser retirado. Actualmente, con mejores técnicas de análisis imagenológico es posible identificar el origen de la lesión apical, por lo tanto, es posible seleccionar los ca

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Chilà, Deborah. "Dose tracking in radiation oncology using daily CBCT: effects of physical parameters on dose calculation accuracy." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2020. http://amslaurea.unibo.it/20587/.

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The availability of cone beam computerized tomography (CBCT) images at the time of treatment has opened possibilities for recalculations and tracking of the delivered dose, becoming an effective tool for adaptive radiotherapy. A significant component in the accuracy of dose recalculation on CBCT images is the calibration of the Hounsfield units (HU) to density. The aim of this thesis, developed at the Policlinic of Modena, is to assert a methodology for the characterization of the HU-to-density calibration curve, and to evaluate the impact of the calibration phantom inserts composition and ph

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Vallaeys, Karen. "Exploitation des données endodontiques en tomographie volumique : de la microtomographie in vitro à la scanographie in vivo." Thesis, Brest, 2017. http://www.theses.fr/2017BRES0144/document.

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La Tomographie Volumique à Faisceau Conique (TVFC) est une technologie d’imagerie tridimensionnelle très pertinente à utiliser en odontologie. Notre travail a pour objectifs de montrer ses intérêts et les applications spécifiques en endodontie. Après avoir redéfini les conséquences délétères possibles per et post opératoires des traitements endodontiques et expliqué les principes de la TVFC, nous explorons dans un premier temps les effets de la préparation canalaire in vitro à l’aide de la microtomographie à haute résolution puis, dans un second temps, la problématique et les intérêts de la cr

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Allareddy, Veeratrishul. "Incidental findings on cone beam computed tomography." Thesis, University of Iowa, 2009. https://ir.uiowa.edu/etd/457.

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17

Doshi, Susan. "Statistical image analysis in cone-beam computed tomography." Thesis, University of Bath, 2014. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.619218.

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Cone-beam computed tomography (CBCT) is used to verify the patient’s position prior to commencing radiotherapy treatment. Soft tissues such as the prostate are hard to distinguish, and so gold markers may be implanted. These markers cause artefacts in the 3D reconstruction. In this thesis, we apply statistical image analysis techniques to CBCT data, with two purposes: we estimate the marker locations (with an assessment of uncertainty), and create reconstructions with fewer artefacts. In our first analysis, we define a Bayesian statistical model for the projection data, encouraging local smoot

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18

Balasundaram, Ashok Mol André. "Cone beam computed tomography imaging of periodontal bone." Chapel Hill, N.C. : University of North Carolina at Chapel Hill, 2008. http://dc.lib.unc.edu/u?/etd,2063.

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Thesis (M.S.)--University of North Carolina at Chapel Hill, 2008.<br>Title from electronic title page (viewed Feb. 17, 2009). "... in partial fulfillment of the requirements for the degree of Master of Science in the Department of Diagnostic Sciences and General Dentistry, School of Dentistry." Discipline: Diagnostic Sciences and General Dentistry; Department/School: Dentistry.

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19

Mason, Jonathan Hugh. "Quantitative cone-beam computed tomography reconstruction for radiotherapy planning." Thesis, University of Edinburgh, 2018. http://hdl.handle.net/1842/33193.

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Radiotherapy planning involves the calculation of dose deposition throughout the patient, based upon quantitative electron density images from computed tomography (CT) scans taken before treatment. Cone beam CT (CBCT), consisting of a point source and flat panel detector, is often built onto radiotherapy delivery machines and used during a treatment session to ensure alignment of the patient to the plan. If the plan could be recalculated throughout the course of treatment, then margins of uncertainty and toxicity to healthy tissues could be reduced. CBCT reconstructions are normally too poor t

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20

Amor, Zaineb. "Bone segmentation and extrapolation in Cone-Beam Computed Tomography." Thesis, KTH, Skolan för elektroteknik och datavetenskap (EECS), 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-279802.

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This work was done within the French R&D center of GE Medical Systems and focused on two main tasks: skull bone segmentation on 3D Cone-Beam Computed Tomography (CBCT) data and skull volumetric shape extrapolation on 3D CBCT data using deep learning approaches. The motivation behind the first task is that it would allow interventional radiologists to visualize only the vessels directly without adding workflow to their procedures and exposing the patients to extra radiations. The motivation behind the second task is that it would help understand and eventually correct some artifacts related

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Adler, Jonas. "GPU Monte Carlo scatter calculations for Cone Beam Computed Tomography." Thesis, KTH, Numerisk analys, NA, 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-140221.

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A GPU Monte Carlo code for x-ray photon transport has been implemented and extensively tested. The code is intended for scatter compensation of cone beam computed tomography images. The code was tested to agree with other well known codes within 5% for a set of simple scenarios. The scatter compensation was also tested using an artificial head phantom. The errors in the reconstructed Hounsfield values were reduced by approximately 70%. Several variance reduction methods have been tested, although most were found infeasible on GPUs. The code is nonetheless fast, and can simulate approximately 3

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Patel, Shanon. "The clinical applications of cone beam computed tomography in endodontics." Thesis, King's College London (University of London), 2012. https://kclpure.kcl.ac.uk/portal/en/theses/the-clinical-applications-of-cone-beam-computed-tomography-in-endodontics(28daff53-0941-4b36-b8ea-beeb7dc2a8e6).html.

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A series of 5 investigations assessed the application of cone beam computed tomography (CBCT) for the management of endodontic problems. Cone beam computed tomography improved the detection of the presence and absence of simulated periapical lesions in human dry mandibles. The overall sensitivity was 0.248 and 1.0 for periapical radiography and CBCT respectively. The receiver operating characteristics (ROC) area under the curve (AUC) values were 0.791 and 1.000 for intraoral radiography and CBCT, respectively. There was no improvement in the detection of artificially created vertical root frac

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Schöndube, Harald [Verfasser]. "Helical Cone-Beam Computed Tomography using the Differentiated Backprojection / Harald Schöndube." Aachen : Shaker, 2010. http://d-nb.info/1106838726/34.

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Bhatia, Navnina. "Scattering correction in cone beam tomography using continuously thickness-adapted kernels." Thesis, Lyon, 2016. http://www.theses.fr/2016LYSEI092.

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La tomodensitométrie intégrant une source de rayons X à faisceau divergent et un détecteur grand champ est une technique bien connue dans le domaine de la tomographie industrielle. La nature des matériaux et les épaisseurs traversées conduisent inévitablement à la génération de rayonnement diffusé. Ce dernier est généré par l’objet mais également par le détecteur. La présence de rayonnement parasite conduit à ne plus respecter l’hypothèse de la loi de Beer-Lambert. Par conséquent, on voit apparaitre sur les coupes tomographiques des artefacts de reconstruction comme des streaks, des effets ven

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25

England, Gregory Miles. "Effect of Scanning Conditions on Cone Beam Computed Tomography Gray Value." The Ohio State University, 2016. http://rave.ohiolink.edu/etdc/view?acc_num=osu1458951153.

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26

Markwell, Timothy S. "MegaVoltage Cone Beam Computed Tomography with a standard medical linear accelerator." Thesis, Queensland University of Technology, 2015. https://eprints.qut.edu.au/87438/1/Timothy_Markwell_Thesis.pdf.

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Accurate patient positioning is vital for improved clinical outcomes for cancer treatments using radiotherapy. This project has developed Mega Voltage Cone Beam CT using a standard medical linear accelerator to allow 3D imaging of the patient position at treatment time with no additional hardware required. Providing 3D imaging functionality at no further cost allows enhanced patient position verification on older linear accelerators and in developing countries where access to new technology is limited.

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Pengpan, Thanyawee. "A combination of motion-compensated cone-beam computed tomography image reconstruction and electrical impedance tomography." Thesis, University of Bath, 2012. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.558873.

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Cone-beam computed tomography (CBCT) is an imaging technique used in conjunction with radiation therapy. CBCT is used to verify the position of tumours just prior to radiation treatment session. The accuracy of the radiation treatment of thoracic and upper abdominal tumours is heavily affected by respiratory movement. Blurring artefacts, due to the movement during a CBCT scanning, cause misregistration between the CBCT image and the planning image. There has been growing interest in the use of motion-compensated CBCT for correcting the breathing-induced artefacts. A wide range of iterative rec

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Zekry, Ahmed Khaled Ahmed Abdin. "Facial alveolar bone wall width: a cone beam computed tomography (CBCT) study in Asians." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2012. http://hub.hku.hk/bib/B48395663.

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Background: The width of the facial alveolar bone wall is crucial for long term successful esthetic outcomes of implants immediately placed into extraction sockets. A threshold of 2 mm is recommended to minimize buccal vertical bone resorption. Aim: To assess the width of the facial alveolar bone wall using cone-beam computed tomography images (CBCT). Methods: Retrospective CBCT images were acquired from a representative sample of Asians using the i-CAT® classic system with a 0.4 mm voxel size. At random, 200 CBCT images were selected according to predefined criteria. The DICOM file was im

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Allen, Jessica. "Evaluation of Maxillary Molar Furcations, Clinical Measurements versus Cone Beam Computed Tomography." VCU Scholars Compass, 2014. http://scholarscompass.vcu.edu/etd/3407.

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BACKGROUND: The use of three-dimensional imaging has shown to provide advantages to the clinician in assessing bone morphology. The aim of this study will be to compare the diagnostic efficacy of cone beam computed tomography (CBCT) versus diagnostic clinical measurements in patients presenting with furcation involved maxillary first molars. METHODS: The study population included 20 patients with 34 maxillary first molar teeth with furcation involvement. Clinical horizontal and vertical probing measurements were compared to CBCT measurements taken by two calibrated examiners. RESULTS: Horizont

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Chen, Shufei. "Markerless Lung Tumor Trajectory Estimation from Rotating Cone Beam Computed Tomography Projections." VCU Scholars Compass, 2016. http://scholarscompass.vcu.edu/etd/4439.

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Respiration introduces large tumor motion in the thoracic region which influences treatment outcome for lung cancer patients. Tumor motion management techniques require characterization of temporal tumor motions because tumor motion varies patient to patient, day to day and cycle to cycle. This work develops a markerless algorithm to estimate 3 dimensional (3D) lung-tumor trajectories on free breathing cone beam computed tomography (CBCT) projections, which are 2 dimensional (2D) sequential images rotating about an axis and are used to reconstruct 3D CBCT images. A gold standard tumor trajecto

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Hidalgo, Rivas Jose Alejandro. "Aspects of dental cone-beam computed tomography in children and young people." Thesis, University of Manchester, 2014. https://www.research.manchester.ac.uk/portal/en/theses/aspects-of-dental-conebeam-computed-tomography-in-children-and-young-people(6656111c-8b79-4ad2-b35c-e02d1f47d211).html.

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Cone-beam computed tomography (CBCT) has become increasingly popular in dentistry. It is usually associated with radiation doses that are lower than those seen with conventional computed tomography (CT) but greater than those seen with dental radiography. Because exposure to ionising radiation is associated with risks, the radiation protection principles of justification and optimisation should be applied. These are especially important in children and young people due to their greater risk of developing stochastic effects. Justification requires a balancing of the radiation risk with the pote

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32

Laurent, Caroline A. "An evaluation of facial asymmetry using three-dimensional cone-beam computed tomography." Diss., Search in ProQuest Dissertations & Theses. UC Only, 2009. http://gateway.proquest.com/openurl?url_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:dissertation&res_dat=xri:pqdiss&rft_dat=xri:pqdiss:1465485.

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Karimi, Davood. "Sparsity-based methods for image reconstruction and processing in cone-beam computed tomography." Thesis, University of British Columbia, 2016. http://hdl.handle.net/2429/58483.

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X-ray computed tomography (CT) is an essential tool in modern medicine. As the scale and diversity of the medical applications of CT continue to increase, the quest for reducing the radiation dose becomes of extreme importance. However, producing high-quality images from low-dose scans has proven to be a serious challenge. Therefore, further research in developing more effective image reconstruction and processing algorithms for CT is necessary. This dissertation explores the potential of patch-based image models and total variation (TV) regularization for improving the quality of low-dose

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Vroome, Kyle M. "Anterior alveolar bone changes following premolar extractions : a cone beam computed tomography evaluation /." Oklahoma City : [s.n.], 2009.

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Anamali, Sindhura. "Prevalence of the posterior superior alveolar canal assessed with cone beam computed tomography." Thesis, University of Iowa, 2012. https://ir.uiowa.edu/etd/1425.

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Jones, Elizabeth Marie Matteson. "Comparing Cone Beam Computed Tomography with Multi-Slice Computed Tomography in Diagnosing Osseous Defects at the Mandibular Condyle." The Ohio State University, 2015. http://rave.ohiolink.edu/etdc/view?acc_num=osu1427278935.

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Riblett, Matthew J. "Motion-Induced Artifact Mitigation and Image Enhancement Strategies for Four-Dimensional Fan-Beam and Cone-Beam Computed Tomography." VCU Scholars Compass, 2018. https://scholarscompass.vcu.edu/etd/5542.

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Four dimensional imaging has become part of the standard of care for diagnosing and treating non-small cell lung cancer. In radiotherapy applications 4D fan-beam computed tomography (4D-CT) and 4D cone-beam computed tomography (4D-CBCT) are two advanced imaging modalities that afford clinical practitioners knowledge of the underlying kinematics and structural dynamics of diseased tissues and provide insight into the effects of regular organ motion and the nature of tissue deformation over time. While these imaging techniques can facilitate the use of more targeted radiotherapies, issues surrou

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Ariyaratne, Hemal. "Dosimetric investigation of image-guided radiotherapy for prostate cancer using cone-beam computed tomography." Thesis, University College London (University of London), 2018. http://discovery.ucl.ac.uk/10046186/.

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Objectives: 1. To survey the current practice of image-guided radiotherapy (IGRT) for prostate cancer in the United Kingdom. 2. To validate a practical dose calculation strategy on cone-beam computed tomography (CBCT) 3. To assess the effect of CBCT verification imaging frequency on actual dose delivered to target volume and organs at risk during a course of image-guided radiotherapy for prostate cancer. 4. To compare the dosimetric effects of reduction of CTV-PTV margin with daily imaging. / Material and Methods: 59 radiotherapy centres in the United Kingdom were included in an online survey

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Shaik, Shoayeb. "The assessment of osseous changes in the temporomandibular joint using cone beam computed tomography." Thesis, University of the Western Cape, 2013. http://hdl.handle.net/11394/4580.

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>Magister Scientiae - MSc<br>Aim: To compare osseous changes in the mandibular condyles in patients presenting to the Oral Health Center, Tygerburg Campus, with and without clicking of the temporomandibular joint. Background: Clicking of the temporomandibular joint (TMJ) is not a normal occurrence in its form or function. A chronic click may lead to the development of osteoarthritis. A clinical finding of clicking of the joint can reflect osseous changes of the bony structures and form part of the early signs of degenerative joint diseases. These osseous changes can be detected on Cone Beam Co

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Sunnegårdh, Johan. "Combining analytical and iterative reconstruction in helical cone-beam CT." Licentiate thesis, Computer Vision, 2007. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-8286.

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<p>Contemporary algorithms employed for reconstruction of 3D volumes from helical cone beam projections are so called non-exact algorithms. This means that the reconstructed volumes contain artifacts irrespective of the detector resolution and number of projection angles employed in the process. In this thesis, three iterative schemes for suppression of these so called cone artifacts are investigated.</p><p>The first scheme, iterative weighted filtered backprojection (IWFBP), is based on iterative application of a non-exact algorithm. For this method, artifact reduction, as well as spatial res

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Alhazmi, Daniah Mansour. "Comparative study of dosimetry in two cone beam CT devices: I-CAT FLX and CS9000." Thesis, University of Iowa, 2018. https://ir.uiowa.edu/etd/3239.

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Introduction: Increasing the imaging demand in the dental field has lead to a dramatic increase in the number of CBCT machines in the U.S. market with a variety of new models and features, as well as different radiation exposures. These differences in exposure among the different CBCT machines and the potential for radiation accumulation over a life time are major concerns for aiming for a reduction in patients’ radiation exposure. Most of the studies have aimed to measure the radiation dose in different CBCT units with different field of views. Up to date, few studies have aimed to measure th

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Lalani, Sara. "Three-dimensional CBCT analysis of cranial base symmetry." Thesis, Boston University, 2015. https://hdl.handle.net/2144/37816.

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Thesis (MSD) --Boston University, Henry M. Goldman School of Dental Medicine, 2015 (Department of Orthodontics and Dentofacial Orthopedics).<br>Includes bibliographic references: leaves 37-42.<br>Background: Craniofacial skeletal asymmetry is a common finding in the general population that often goes undetected. Interest in this topic has led to many studies aimed at describing this type of asymmetry, its distribution and etioIogy. The cranial base, being cIosely related to the face and brain, is a key component in craniofacial growth and may also display varying amounts of asymmetry contribut

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Joshi, Jimish Dilip. "Characterization and Improvement of a Cone-Beam CT Scanner for Quantitative Imaging." Wright State University / OhioLINK, 2010. http://rave.ohiolink.edu/etdc/view?acc_num=wright1284997522.

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Bevilacqua, Francesca. "Projection and reconstruction-based noise filtering methods in cone beam CT." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2019.

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This thesis has been motivated and developed within a collaboration project between the Department of Mathematics of the University of Bologna and the company Skanray Europe Srl. In detail, this work focuses on Cone Beam CT reconstruction of the human head, with particular interest in detecting small soft tissue elements within white and grey brain matter. This problem is expecially difficult due to the small contrast in the X-ray attenuation coefficient between the two substances to be discriminated. After accurately modelling the data acquisition process (also according to the requireme

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Fentner, David A. "A Comparative Image Quality Analysis between Multi-Slice Computed Tomography and Cone Beam Computed Tomography for Radiation Treatment Planning Purposes." University of Toledo Health Science Campus / OhioLINK, 2013. http://rave.ohiolink.edu/etdc/view?acc_num=mco1372413982.

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Morin, Olivier. "The development and role of megavoltage cone beam computerized tomography in radiation oncology." Diss., 2007. http://gateway.proquest.com/openurl?url_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:dissertation&res_dat=xri:pqdiss&rft_dat=xri:pqdiss:3288953.

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Wang, Yung-Ching, and 王泳清. "Cone Beam Computerized Tomography and Dentistry Applied Research –An Study of A Teaching Hospital in Middle Region of Taiwan." Thesis, 2019. http://ndltd.ncl.edu.tw/handle/8y3n9r.

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碩士<br>國立雲林科技大學<br>電機工程系<br>107<br>In this study, the author collaborated with the Department of Dentistry, National Taiwan University Hospital, Yunlin Branch, stacking patients’ digital images obtained using cone beam computerized tomography to create three-dimensional (3D) dental models. The 3D dental models, which contained multiple teeth, were subsequently segmented, retaining only the teeth to be printed. To perform an implantation or replantation preoperative assessment, a customized model of the targeted tooth, including its root, and the full 3D dental model were printed out and ligh

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Nurbakhsh, Babak. "Resolution of Maxillary Sinus Mucositis after Endodontic Treatment of Maxillary Teeth with Apical Periodontitis: A Cone-beam Computerized Tomography Pilot Study." Thesis, 2011. http://hdl.handle.net/1807/31371.

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This study characterized maxillary sinus mucositis (SIMS) adjacent to teeth with apical periodontitis (AP), and assessed its resolution three months after endodontic treatment. 29 subjects who maxillary posterior teeth with AP were imaged with cone-beam computed tomography (CBCT). Resolution of SIMS was assessed with CBCT three months after treatment, and periapical healing was assessed using the PAI after six months. Four non-compliant subjects were discontinued and SIMS was identified in 14/25 subjects (56%). Three months post-treatment, SIMS was resolved fully in 3/10 subjects (30%), and pa

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Lagravere, Vich Manuel Oscar. "Analysis of skeletal and dental changes with a tooth-borne and a bone-borne maxillary expansion appliance assessed through digital volumetric imaging." Phd thesis, 2009. http://hdl.handle.net/10048/504.

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The purpose of this research was to compare skeletal and dental changes assessed by digital volumetric images produced during and after rapid maxillary expansion (RME) between a bone-borne anchored expansion appliance and a conventional tooth-borne RME. Initial steps included the development of a methodology to analyze CBCT images. Reliability of traditional two dimensional (2D) cephalometric landmarks identified in CBCT images was explored, and new landmarks identifiable on the CBCT images were also evaluated. This methodology was later tested through a clinical trial with 62 patients where s

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CHOU, CHUN-CHUAN, and 周淳娟. "To Explore the Feasibility of the Position Deviation Conversion between Rotation Axis and Translational Axis in Cone-Beam Computerized Tomography for Breast Cancer Patients." Thesis, 2019. http://ndltd.ncl.edu.tw/handle/snahm8.

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碩士<br>中臺科技大學<br>醫學影像暨放射科學系暨研究所<br>107<br>According to the formula in converting the rotation axis and translation axis into the translation axis, the data from the cone-beam computed tomography (CBCT) of the breast cancer patient is retrospectively collected. Comparing the difference between the data before and after conversion and explore whether the formula can be directly applied to the patient who received breast cancer radiotherapy (RT) on the treatment couch lack of the rotation axis correction function. The CBCT data before RT for breast cancer patients were collected from January 1, 20

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