Quantitative measurement of scattered photons during gamma ray transmision CT by means of Monte Carlo simulations

K. Ogawa, Y. Kawamura, A. Kubo, T. Ichihara

Research output: Contribution to conferencePaperpeer-review

Abstract

Quantitative image reconstruction in single photon emission CT requires an accurate attenuation map of a cross section of an object. Several data acquisition geometries have been proposed to obtain the true attenuation map by means of gamma-ray transmission CT (TCT). In the transmission data scattered photons are sometimes measured and they reduce the accuracy of reconstructed TCT images. To investigate the effects of scattered photons in gamma-ray transmission CT, we performed Monte Carlo simulations for several types of data acquisition systems. Examined geometries were (a) a flood source and a parallel hole collimator, (b) a collimated flood source and a parallel hole collimator, (c) a line source and a symmetric fan beam collimator, and (d) a collimated line source and a symmetric fan beam collimator. The results showed that a fan beam collimator and a line source rejected most of the scattered photons generated inside an object, and that if we collimated emitted photons at the source side, almost all the scattered photons could be rejected at the collimator on the detector side.

Original languageEnglish
Pages1411-1415
Number of pages5
Publication statusPublished - 1996
Externally publishedYes
EventProceedings of the 1996 IEEE Nuclear Science Symposium. Part 1 (of 3) - Anaheim, CA, USA
Duration: 02-11-199609-11-1996

Conference

ConferenceProceedings of the 1996 IEEE Nuclear Science Symposium. Part 1 (of 3)
CityAnaheim, CA, USA
Period02-11-9609-11-96

All Science Journal Classification (ASJC) codes

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

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