Image evaluation for CZT Compton PET using backprojection and MLEM method

Changyeon Yoon, Wonho Lee

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

Abstract

This study presents the image evaluation for CZT Compton PET using simple backprojection and an MLEM (Maximum Likelihood Expectation Maximization) method. Compton PET can use not only the photoelectric effect but also the Compton scattering effect for image reconstruction, and hence the detection efficiency should be inherently higher than that of conventional PET. By using a pixelized CZT detector, the detected position and deposited energy of the gamma ray were found precisely. With the position and energy information, the interaction sequence, which was one of the main factors to consider in the reconstruction of the source image, was identified correctly. The reconstruction algorithms were simple backprojection and MLEM, and three methods were used to evaluate the CZT Compton PET compared with conventional PET which uses the photoelectric effect only. The FWHMs (Full Widths at Half Maximum) and the maximum counts of images reconstructed by simple backprojection were calculated for comparison. Using an MLEM method, the FWHM and the relative standard deviation of the counts in the range of half of the FWHM around the maximum pixel were calculated at each iteration to evaluate the modalities quantitatively. For a 3D source phantom, simple backprojection and the MLEM method were applied to each modality and the reconstructed images were compared with each other by visual inspection.

Original languageEnglish
Title of host publication2011 IEEE Nuclear Science Symposium and Medical Imaging Conference, NSS/MIC 2011
PublisherInstitute of Electrical and Electronics Engineers Inc.
Pages1377-1379
Number of pages3
ISBN (Print)9781467301183
DOIs
Publication statusPublished - 2011
Event2011 IEEE Nuclear Science Symposium and Medical Imaging Conference, NSS/MIC 2011 - Valencia, Spain
Duration: 2011 Oct 232011 Oct 29

Publication series

NameIEEE Nuclear Science Symposium Conference Record
ISSN (Print)1095-7863

Other

Other2011 IEEE Nuclear Science Symposium and Medical Imaging Conference, NSS/MIC 2011
CountrySpain
CityValencia
Period11/10/2311/10/29

ASJC Scopus subject areas

  • Radiation
  • Nuclear and High Energy Physics
  • Radiology Nuclear Medicine and imaging

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