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Performance of a cadmium tungstate MVCT scanner Open Access


Other title
megavoltage computed tomography
image performance
cone beam computed tomography
contrast to noise ratio
Type of item
Degree grantor
University of Alberta
Author or creator
Kirvan, Paul Francis
Supervisor and department
Rathee, Satyapal (Oncology)
Examining committee member and department
Morsink, Sharon (Physics)
Sloboda, Ron (Oncology, Physics)
Fallone, Gino (Oncology, Physics)
Riauka, Terence (Oncology)
Department of Physics

Date accepted
Graduation date
Master of Science
Degree level
Megavoltage computed tomography (MVCT) and megavoltage cone beam computed tomography can be used for visualizing anatomical structures prior to radiation therapy treatments to assist in patient setup and target localization. These systems provide images using the same beam used for patient treatment, however their image contrast is limited by the low detective quantum efficiency (DQE) of the detectors currently available. By using higher DQE thick, segmented cadmium tungstate detectors we can improve the system contrast. This in turn would permit enhanced soft tissue visualization, allowing MVCT to be more useful. This thesis describes the evaluation of a prototype MVCT system that uses thick, segmented detectors. The system was found to be able to easily visualize a 15 mm diameter 1.5% contrast target with 2 cGy of radiation dose delivered. This system could become the basis for improved commercial MVCT systems.
Permission is hereby granted to the University of Alberta Libraries to reproduce single copies of this thesis and to lend or sell such copies for private, scholarly or scientific research purposes only. Where the thesis is converted to, or otherwise made available in digital form, the University of Alberta will advise potential users of the thesis of these terms. The author reserves all other publication and other rights in association with the copyright in the thesis and, except as herein before provided, neither the thesis nor any substantial portion thereof may be printed or otherwise reproduced in any material form whatsoever without the author's prior written permission.
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File title: KirvanThesisFinal
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