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Proceedings Paper

A comparison of methods for estimating the line spread function of a CT imaging system
Author(s): Samir Abboud; Kristina Lee; Kaleb Vinehout; Sophie Paquerault; Iacovos S. Kyprianou
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Paper Abstract

A quantitative description of the deterministic properties of a CT system is necessary when evaluating image quality. The most common such metric is the modulation transfer function (MTF), usually calculated from a line spread function (LSF) or point spread function (PSF). Currently, there exist many test objects used to measure the LSF or PSF. In this paper we report on a comparison of these measures using: a thin foil slit test object, a teflon cube edge test object and a novel "negative" cube test object. Images were acquired using a custom-built bench-top flat-panel-based cone-beam CT scanner and a cylindrical water-filled PMMA phantom with the test objects embedded in the middle. From the 3-dimensional reconstructed volumes, we estimated the LSF either directly or as estimated from the edge spread function. From these, a modulation transfer function can be estimated, and the frequency dependent image transfer of each object can be reported.

Paper Details

Date Published: 16 March 2011
PDF: 10 pages
Proc. SPIE 7961, Medical Imaging 2011: Physics of Medical Imaging, 79615V (16 March 2011); doi: 10.1117/12.877665
Show Author Affiliations
Samir Abboud, U.S. Food and Drug Administration (United States)
Univ. of Maryland, Baltimore (United States)
Univ. of Maryland, College Park (United States)
Kristina Lee, Marquette Univ. (United States)
Kaleb Vinehout, Marquette Univ. (United States)
Sophie Paquerault, U.S. Food and Drug Administration (United States)
Iacovos S. Kyprianou, U.S. Food and Drug Administration (United States)
Univ. of Maryland, College Park (United States)


Published in SPIE Proceedings Vol. 7961:
Medical Imaging 2011: Physics of Medical Imaging
Norbert J. Pelc; Ehsan Samei; Robert M. Nishikawa, Editor(s)

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