Comparison of 180° and 360° Iterative Reconstruction with Non-uniform Attenuation Compensation for Tl-201 SPECT†

K. J. LaCroix, B. M.W. Tsui, B. H. Hasegawa

Research output: Contribution to journalArticlepeer-review

5 Scopus citations


This study compares Tl-201 SPECT images reconstructed from 180° and 360° projection data, using iterative reconstruction with non-uniform attenuation compensation. Using a mathematical phantom of the human thorax, Monte Carlo simulation is used to produce both 180° (45° RAO to 45° LPO) and 360° Tl-201 SPECT projection data. Included in the simulation are the effects of non-uniform attenuation, detector response, scatter and statistical noise. The 180° and 360° data were taken over 64 and 128 angles, respectively, assuming the same total acquisition time for both. The simulated projection data were reconstructed with nonuniform attenuation compensation using the ML-EM algorithm for 50 iterations and, for comparison, were also reconstructed without attenuation compensation using the filtered backprojection method with a ramp filter. Transaxial slices of the reconstructed images, image profiles and Bull's-eye plots all show that images reconstructed with attenuation compensation, unlike those reconstructed without attenuation compensation, are essentially the same within the region of the myocardium for the 180° and 360° data, with few artifacts and similar image contrast. Furthermore, for the same total imaging time, the images reconstructed from the 180° data have slightly less noise in the myocardial region.

Original languageEnglish (US)
Pages (from-to)1276-1281
Number of pages6
JournalIEEE Transactions on Nuclear Science
Issue number4
StatePublished - Aug 1995
Externally publishedYes

ASJC Scopus subject areas

  • Nuclear and High Energy Physics
  • Nuclear Energy and Engineering
  • Electrical and Electronic Engineering


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