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An experimental small animal PET using two 3-D position sensitive CdZnTe detectors was developed and tested. Each 1.5×1.5×1 cm3 CdZnTe detector employs 11 by 11 pixellated anodes wire-bonded to the VAS3.1/TAT3/MCR3 readout electronics. Each detector can obtain the deposited energy and 3-D coordinates for single-pixel and multiple-pixel events. Both systems achieved energy resolutions of better than 1.0% FWHM at 662 ReV for single-pixel events and better than 1.5% FWHM at 662 ReV for two-pixel events. The position resolution of each detector was estimated to be ∼1.3×1.3×0.5 mm3. Modifications to the firmware of the readout board and additions of custom-built circuitry enabled coincidence measurement between two 3-D CdZnTe detector systems using VAS3.1/TAT3/MCR3 readout systems. Spatial resolution improvements by using depth of interaction (DOI) and by identifying the first interaction using Compton scattering angle reconstruction are reported and discussed.
Nuclear Science Symposium Conference Record, 2005 IEEE (Volume:3 )
Date of Conference: 23-29 Oct. 2005