Composite modulation transfer function evaluation of a cone beam computed tomography breast imaging system

Ricardo Betancourt-Benitez; Ruola Ning; David ConoverShaohua Liu

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Composite modulation transfer function evaluation of a cone beam computed tomography breast imaging system

机译：Composite modulation transfer function evaluation of a cone beam computed tomography breast imaging system

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摘要

Several factors during the scanning process, image reconstruction and geometry of an imaging system, influence the spatial resolution of a computed tomography imaging system. In this work, the spatial resolution of a state of the art flat panel detector-based cone beam computed tomography breast imaging system is evaluated. First, scattering, exposure level, voltage, voxel size, pixel size, back-projection filter, reconstruction algorithm, and number of projections are varied to evaluate their effect on spatial resolution. Second, its uniformity throughout the whole field of view is evaluated as a function of radius along the x-y plane and as a function of z at the center of rotation. The results of the study suggest that the modulation transfer function is mainly influenced by the pixel, back-projection filter, and number of projections used. The evaluation of spatial resolution throughout the field of view also suggests that this imaging system does have a 3-D quasi-isotropic spatial resolution in a cylindrical region of radius equal to 40 mm centered at the axis of rotation. Overall, this study provides a useful tool to determine the optimal parameters for the best possible use of this cone beam computed tomography breast imaging system.

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来源
《Optical Engineering》 |2009年第11期|117002-1-117002-11|共11页
作者
Ricardo Betancourt-Benitez; Ruola Ning; David ConoverShaohua Liu;
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作者单位

University of Rochester Medical Center, Department of Imaging Sciences, 601 Elmwood Avenue, Rochester, New York 14642;

University of Rochester Medical Center, 601 Elmwood Avenue, Department of Imaging Sciences, Rochester, New York 14642;

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收录信息美国《科学引文索引》(SCI);美国《工程索引》(EI);
原文格式 PDF
正文语种英语
中图分类计量学;
关键词
cone beam computer tomography; modulation transfer function; cone beam flat panel detector; breast imaging systems;

Composite modulation transfer function evaluation of a cone beam computed tomography breast imaging system

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