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Optical Engineering

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

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.

Paper Details

Date Published: 1 November 2009
PDF: 11 pages
Opt. Eng. 48(11) 117002 doi: 10.1117/1.3258348
Published in: Optical Engineering Volume 48, Issue 11
Show Author Affiliations
Ricardo Betancourt-Benitez, Univ. of Rochester Medical Ctr. (United States)
Ruola Ning, Univ. of Rochester Medical Ctr. (United States)
David L. Conover, Univ. of Rochester Medical Ctr. (United States)
Shaohua Liu, Univ. of Rochester (United States)


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