A comparison of methods for estimating the line spread function of a CT imaging system

Samir F Abboud*, Kristina Lee, Kaleb Vinehout, Sophie Paquerault, Iacovos S. Kyprianou

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingConference contribution

3 Scopus citations


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.

Original languageEnglish (US)
Title of host publicationMedical Imaging 2011
Subtitle of host publicationPhysics of Medical Imaging
StatePublished - 2011
EventMedical Imaging 2011: Physics of Medical Imaging - Lake Buena Vista, FL, United States
Duration: Feb 13 2011Feb 17 2011

Publication series

NameProgress in Biomedical Optics and Imaging - Proceedings of SPIE
ISSN (Print)1605-7422


ConferenceMedical Imaging 2011: Physics of Medical Imaging
Country/TerritoryUnited States
CityLake Buena Vista, FL

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Atomic and Molecular Physics, and Optics
  • Biomaterials
  • Radiology Nuclear Medicine and imaging


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