title: SemiSPECT: A Small-animal Imaging System Based on Eight CdZnTe Pixel Detectors.
abstract: We have constructed a SPECT system for small animals that utilizes eight CdZnTe pixel detectors. The eight detectors are arranged in a single octagonal ring, where each views the object to be imaged through a single pinhole. Additional projections are obtained via rotation of the animal. Each CdZnTe detector is approximately 2 mm in thickness and is patterned on one surface into a 64×64 array of pixels with 380 micron pitch. We have designed an electronic readout system capable of collecting data from the eight detectors in listmode. In this scheme each event entry for a gamma-ray hit includes the pulse height of the pixel with the largest signal and the pulse height for each of its eight nearest neighbors. We present details of the overall design, the electronics, and system performance.
authors.affiliation: Department of Radiology, University of Arizona, Tucson, AZ 85724 USA.
authors.forename: Todd E
authors.initials: TE
authors.lastname: Peterson
authors.affiliation: Optical Sciences Center, University of Arizona, Tucson, AZ 85721 USA.
authors.forename: Hyunki
authors.initials: H
authors.lastname: Kim
authors.affiliation: Optical Sciences Center, University of Arizona, Tucson, AZ 85721 USA.
authors.forename: Michael J
authors.initials: MJ
authors.lastname: Crawford
authors.affiliation: Optical Sciences Center, University of Arizona, Tucson, AZ 85721 USA.
authors.forename: Benjamin M
authors.initials: BM
authors.lastname: Gershman
authors.affiliation: Department of Physics, University of Arizona, Tucson, AZ 85721 USA.
authors.forename: William C J
authors.initials: WC
authors.lastname: Hunter
authors.affiliation: Department of Radiology, University of Arizona, Tucson, AZ 85724 USA. They are also with the Optical Sciences Center, University of Arizona, Tucson, AZ 85721 USA.
authors.forename: H Bradford
authors.initials: HB
authors.lastname: Barber
authors.affiliation: Department of Radiology, University of Arizona, Tucson, AZ 85724 USA. They are also with the Optical Sciences Center, University of Arizona, Tucson, AZ 85721 USA.
authors.forename: Lars R
authors.initials: LR
authors.lastname: Furenlid
authors.affiliation: Department of Radiology, University of Arizona, Tucson, AZ 85724 USA.
authors.forename: Donald W
authors.initials: DW
authors.lastname: Wilson
authors.affiliation: Department of Radiology, University of Arizona, Tucson, AZ 85724 USA.
authors.forename: James M
authors.initials: JM
authors.lastname: Woolfenden
authors.affiliation: Department of Radiology, University of Arizona, Tucson, AZ 85724 USA. They are also with the Optical Sciences Center, University of Arizona, Tucson, AZ 85721 USA.
authors.forename: Harrison H
authors.initials: HH
authors.lastname: Barrett
keywords: Biomedical imaging; cadmium zinc telluride (CdZnTe); single photon emission computed tomography (SPECT); small-animal imaging