title: Tomographic Small-Animal Imaging Using a High-Resolution Semiconductor Camera.
abstract: We have developed a high-resolution, compact semiconductor camera for nuclear medicine applications. The modular unit has been used to obtain tomographic images of phantoms and mice. The system consists of a 64 x 64 CdZnTe detector array and a parallel-hole tungsten collimator mounted inside a 17 cm x 5.3 cm x 3.7 cm tungsten-aluminum housing. The detector is a 2.5 cm x 2.5 cm x 0.15 cm slab of CdZnTe connected to a 64 x 64 multiplexer readout via indium-bump bonding. The collimator is 7 mm thick, with a 0.38 mm pitch that matches the detector pixel pitch. We obtained a series of projections by rotating the object in front of the camera. The axis of rotation was vertical and about 1.5 cm away from the collimator face. Mouse holders were made out of acrylic plastic tubing to facilitate rotation and the administration of gas anesthetic. Acquisition times were varied from 60 sec to 90 sec per image for a total of 60 projections at an equal spacing of 6 degrees between projections. We present tomographic images of a line phantom and mouse bone scan and assess the properties of the system. The reconstructed images demonstrate spatial resolution on the order of 1-2 mm.
authors.affiliation: Department of Radiology, Division of Nuclear Medicine, University of Arizona, Tucson, AZ 85724 ; Optical Sciences Center, University of Arizona, Tucson, AZ 85721.
authors.forename: G A
authors.initials: GA
authors.lastname: Kastis
authors.affiliation: Joint Graduate Group in Bioengineering, University of California Berkeley and San Francisco.
authors.forename: M C
authors.initials: MC
authors.lastname: Wu
authors.affiliation: Department of Radiology, Division of Nuclear Medicine, University of Arizona, Tucson, AZ 85724 ; Optical Sciences Center, University of Arizona, Tucson, AZ 85721.
authors.forename: S J
authors.initials: SJ
authors.lastname: Balzer
authors.affiliation: Department of Radiology, Division of Nuclear Medicine, University of Arizona, Tucson, AZ 85724.
authors.forename: D W
authors.initials: DW
authors.lastname: Wilson
authors.affiliation: Department of Radiology, Division of Nuclear Medicine, University of Arizona, Tucson, AZ 85724 ; Optical Sciences Center, University of Arizona, Tucson, AZ 85721.
authors.forename: L R
authors.initials: LR
authors.lastname: Furenlid
authors.affiliation: Department of Radiology, Division of Nuclear Medicine, University of Arizona, Tucson, AZ 85724.
authors.forename: G
authors.initials: G
authors.lastname: Stevenson
authors.affiliation: Department of Radiology, Division of Nuclear Medicine, University of Arizona, Tucson, AZ 85724 ; Optical Sciences Center, University of Arizona, Tucson, AZ 85721.
authors.forename: H B
authors.initials: HB
authors.lastname: Barber
authors.affiliation: Department of Radiology, Division of Nuclear Medicine, University of Arizona, Tucson, AZ 85724 ; Optical Sciences Center, University of Arizona, Tucson, AZ 85721.
authors.forename: H H
authors.initials: HH
authors.lastname: Barrett
authors.affiliation: Department of Radiology, Division of Nuclear Medicine, University of Arizona, Tucson, AZ 85724.
authors.forename: J M
authors.initials: JM
authors.lastname: Woolfenden
authors.affiliation: Tecomet, Woburn, MA 01801.
authors.forename: P
authors.initials: P
authors.lastname: Kelly
authors.affiliation: Tecomet, Woburn, MA 01801.
authors.forename: M
authors.initials: M
authors.lastname: Appleby