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16 March 2011 A comparison of methods for estimating the line spread function of a CT imaging system
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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.
© (2011) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Samir Abboud, Kristina Lee, Kaleb Vinehout, Sophie Paquerault, and Iacovos S. Kyprianou "A comparison of methods for estimating the line spread function of a CT imaging system", Proc. SPIE 7961, Medical Imaging 2011: Physics of Medical Imaging, 79615V (16 March 2011); https://doi.org/10.1117/12.877665
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