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Feasibility of using cadmium-zinc-telluride detectors in electronically collimated SPECT

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4 Author(s)
Singh, M. ; Dept. of Radiol., Univ. of Southern California, University Park, CA, USA ; Doty, F.P. ; Friesenhahn, S.J. ; Butler, J.F.

Replacing cryogenically cooled germanium (Ge) with room-temperature operable cadmium-zinc-telluride (CZT) semiconducting detectors as the first detector of an electronically collimated SPECT system would have certain practical advantages. To determine the feasibility of this approach, we have performed a theoretical and experimental study comparing the resolution and detection efficiency of a Ge based system to that of a CZT based system. The results indicate that the detection efficiency of a CZT based system would be a factor of 2.5 lower than a comparable Ge based system at 140 keV and the spatial resolution would also be approximately a factor of two worse. However, at higher energies, the difference between CZT and Ge would decrease, and at 662 keV, for example, the CZT and the Ge systems could have nearly equal detection efficiency and resolution

Published in:

Nuclear Science, IEEE Transactions on  (Volume:42 ,  Issue: 4 )

Date of Publication:

Aug 1995

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