Cone beam collimation for single photon emission computed tomography: analysis, simulation, and image reconstruction using filtered backprojection

Med Phys. 1986 Jul-Aug;13(4):484-9. doi: 10.1118/1.595854.


This paper presents an analysis of two cone beam configurations (having focal lengths of 40 and 60 cm) for the acquisition of single photon emission computed tomography (SPECT) projection data. A three-dimensional filtered backprojection algorithm is used to reconstruct SPECT images of cone beam projection data obtained using Monte Carlo simulations. The mathematical analysis resulted in on-axis point source sensitivities (calculated for a distance of 15 cm from the collimator surface) for cone beam configurations that were 1.4-3 times the sensitivities of parallel-hole and fan beam geometries having similar geometric resolutions. Cone beam collimation offers the potential for improved sensitivity for SPECT devices using large-field-of-view scintillation cameras.

Publication types

  • Research Support, U.S. Gov't, P.H.S.

MeSH terms

  • Humans
  • Mathematics
  • Monte Carlo Method
  • Technology, Radiologic*
  • Tomography, Emission-Computed / instrumentation
  • Tomography, Emission-Computed / methods*