The Effect of Camera Geometry on Singles Flux, Scatter Fraction and Trues and Randoms Sensitivity for Cylindrical 3D PET - A Simulation Study

Ramsey D Badawi, S. G. Kohlmyer, R. L. Harrison, S. D. Vannoy, T. K. Lewellen

Research output: Contribution to journalArticlepeer-review

46 Scopus citations

Abstract

Preliminary results of an assessment of the effects of changing the axial field of view (AFOV) and detector ring diameter (DRD) of a cylindrical PET tomograph on count-rate performance are presented. The assessment was made using Monte Carlo simulations of an anthropomorphic phantom based on the Zubal phantom. This phantom was modified to include cylinders approximating arms and legs, and was sequentially stepped through the AFOV to simulate a wholebody scan covering an axial region of interest of 1m. DRD was varied from -60 cm to -108 cm, and AFOV was varied from 10 cm to 60 crn. A simple activity distribution and deadtime model was assumed to allow the calculation of noiseequivalent count (NEC) rates for a situation similar to that of a typical 18F-FDG study. Both the scatter fraction and singles flux were found to be strongly dependent on DRD, but only weakly dependent on AFOV when the latter was greater than -25 cm. Trues and randoms sensitivity were strongly dependent on AFOV, and randoms sensitivity was also strongly dependent on DRD. Scatter and singles flux do not appear to be limiting factors for extended AFOV configurations, and randoms rates, while high, appear to be manageable with existing detector technology. This initial assessment suggests that for whole-body applications, substantial gains in NEC may be possible by extending the AFOV.

Original languageEnglish (US)
Pages (from-to)1228-1232
Number of pages5
JournalIEEE Transactions on Nuclear Science
Volume47
Issue number3 PART 3
StatePublished - 2000
Externally publishedYes

ASJC Scopus subject areas

  • Electrical and Electronic Engineering
  • Nuclear Energy and Engineering

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