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A new modular detector for a cylindrical brain SPECT system

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3 Author(s)
Wei Chang ; Rush Presbyterian-St. Luke''s Med. Center, Chicago, IL, USA ; Jingai Liu ; Kari, B.

A new detector module has been developed for a prototype system, McSPECT II, which is being constructed for high-resolution clinical brain imaging. The detector module is the building block of the cylindrical detector system of the McSPECT II. Each detector module contains 5 NaI(Tl) bars and is backed by a glass window in an aluminum housing. Each detector module is associated with 6 PMTs to form a functional unit for position estimation. Bench-top tests performed on a sample unit demonstrated an average of 10.5% local energy resolution (ER) at 140 keV. Centroid calculations were applied in both orthogonal directions of the module for position estimation. In the longitudinal direction, a two-step centroid method yields a 13 cm UFOV (useful field-of-view) along the bar and an 11 cm CFOV (center FOV), with intrinsic spatial resolution of <5.5 and 3.8±0.3 mm FWHM, respectively. In the transverse direction, the task of identifying the bar detector involved in an event is simplified, with an accuracy better than 99% when photons are incident normally

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Nuclear Science, IEEE Transactions on  (Volume:41 ,  Issue: 4 )