Development of new high resolution detectors for small animal SPECT imaging

L. R. MacDonald, J. S. Iwanczyk, B. E. Patt, C. R. Tull, P. D. Acton, H. F. Kung, B. M.W. Tsui

Research output: Contribution to conferencePaperpeer-review

3 Scopus citations


New high-resolution gamma-ray detectors are being developed for SPECT imaging of animals. Optimal collimators, reconstruction algorithms and image processing are an important part of the development of animal SPECT. These issues and recent advances in miniature gamma-ray detectors will be presented. Two lines of technical developments are being followed for high-performance gamma-ray imaging systems: the first uses state-of-the-art position-sensitive photomultiplier tubes (PS-PMTs); the second uses silicon-based photodiode detector arrays. Each are coupled to arrays of scintillation crystals. A small system has been assembled with newly developed PS-PMTs that has 1 mm CsI(Na) crystals and was fitted with a hexagonal parallel hole collimator (1.25 mm holes, 0.25 mm septa, 2 cm long). Line spread functions (LSF) were measured with 0.5 mm line sources filled with Tc-99m. The average FWHM of the LSF curves were 2.12 ± 0.16 mm and 2.63 ± 0.15 mm for 0 cm and 1 cm source-collimator distance, respectively. A LSF was made with 1.1 mm pitch (0.85mm CsI(Tl), 0.25 mm spacing) CsI(Tl)-PIN detector collimated with matching geometry 1cm long collimator. Mean FWHM = 1.91 ± 0.32 mm. Preliminary images from each system will be presented.

Original languageEnglish (US)
StatePublished - 2000
Externally publishedYes
Event2000 IEEE Nuclear Science Symposium Conference Record - Lyon, France
Duration: Oct 15 2000Oct 20 2000


Other2000 IEEE Nuclear Science Symposium Conference Record

ASJC Scopus subject areas

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


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