Experimental evaluation of system models for PET with block detectors

Michel S. Tohme, Jinyi Qi

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

1 Scopus citations

Abstract

Modern PET scanners use block detectors. The accuracy of the system models greatly affects the quality of reconstructed images. This work evaluates two approaches to the modeling of PET system response. The first one is a factored system matrix approach that combines analytical calculation and Monte Carlo simulation, while the second stems from purely analytical calculations of solid angle and crystal penetration. Both of them model the block structure. We conduct measurements on the microPET II scanner, which has 90 detector blocks forming 3 axial rings. Each detector block consists of 14×14 equally spaced scintillation crystals with a pitch of 1.15 mm. A Na-22 point source was scanned inside the field of view at every 2.0 mm along the horizontal and vertical directions, and at every 2.8 mm along the 45-degree trajectory within the central axial plane. Sinogram profiles were taken from the projection angle that is perpendicular to the corresponding trajectories. We compared the full width at half maximum (FWHM), peak location, peak intensity, and area under the curve of the measured projection and model-predicted profiles. The results clearly show the effect of detector blocks with the FWHM being piecewise flat as the point source moves away from the radial center. The discontinuous points are consistent with the actual geometry of the scanner. Both system models show reasonably good agreement with experimental measurements.

Original languageEnglish (US)
Title of host publicationIEEE Nuclear Science Symposium Conference Record
Pages2778-2782
Number of pages5
Volume5
DOIs
StatePublished - 2007
Event2006 IEEE Nuclear Science Symposium, Medical Imaging Conference and 15th International Workshop on Room-Temperature Semiconductor X- and Gamma-Ray Detectors, Special Focus Workshops, NSS/MIC/RTSD - San Diego, CA, United States
Duration: Oct 29 2006Nov 4 2006

Other

Other2006 IEEE Nuclear Science Symposium, Medical Imaging Conference and 15th International Workshop on Room-Temperature Semiconductor X- and Gamma-Ray Detectors, Special Focus Workshops, NSS/MIC/RTSD
CountryUnited States
CitySan Diego, CA
Period10/29/0611/4/06

ASJC Scopus subject areas

  • Computer Vision and Pattern Recognition
  • Industrial and Manufacturing Engineering

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