Computed tomography scan optimization using head phantom and radiochromic films
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Universidade Federal de Minas Gerais
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The research and development in technology applied to computed tomography has been improve in the image
quality, resulting in the best identification of diseases, and therefore an increase in the number of exams, among
them the head exams can be highlighted. In order to promote a radioprotection and reduction on the dose of the
general public some international agencies have stipulated dose limits to be followed and the implementation of
the principles of ALARA in all establishments that use ionizing radiation. One of these principles is the
optimization that should be treated with substantial attention, because the reduction of radiation doses can be
feasible as long as it does not compromise the tomographic images; such practice is difficult to perform due to
the lack of proper guidance. In optimization of the CT exams, not only the lowest dose is evaluated to obtain
diagnostic image, but also should be knowledge the dose distribution throughout the scanned area. In this work
were used a cylindrical head phantom of PMMA, a GE Discovery CT scan with 64 channels, and radiochromic
films. The films were positioned in the phantom in their central region for the dose evaluation using the
automatic control for the voltages of 80, 100 and 120 kV. The images were acquired from the scan of the
phantom and the film readings were obtained through digital images. The results show an evaluation of the
longitudinal kerma profiles, dose delivered, and the image noise was also observed using the central slice
images.
Abstract
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Tomografia, Diagnóstico, Imagens e fantasmas (Radiologia), Tecnologia
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Tomography, Radioprotection, Phantom, Diagnostic, Technology
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https://inis.iaea.org/records/n88n0-evs69