title: SPRINT II: a second generation single photon ring tomograph.
abstract: SPRINT II is a stationary detector ring tomograph designed for brain imaging. Eleven two-dimensional sodium iodide camera modules that use maximum-likelihood position logic are arranged in a 50-cm-diameter ring with a scintillator packing fraction of 96%. A 34-cm-diameter rotating lead aperture ring containing either 10 or 12 slits is used for in-plane collimation, while the z-axis collimator is constructed of parallel lead foil rings. The field of view is 22 cm in diameter by 12 cm long. Sensitivity is 10 count/s/muCi for an on-axis (99m)Tc point source and 8500 count/s/muCi/cm(3) for 19.8-cm-diameter by 6.2-cm-long cylindrical source. Longitudinal resolution is 10 mm FWHM, and in-plane resolution varies from 8 mm FWHM on-axis to 5 mm FWHM at a radius of 9 cm. Performance results are presented.
authors.affiliation: Michigan Univ. Med. Center, Ann Arbor, MI.
authors.forename: W L
authors.initials: WL
authors.lastname: Rogers
authors.forename: N H
authors.initials: NH
authors.lastname: Clinthorne
authors.forename: L
authors.initials: L
authors.lastname: Shao
authors.forename: P
authors.initials: P
authors.lastname: Chiao
authors.forename: Y
authors.initials: Y
authors.lastname: Ding
authors.forename: J A
authors.initials: JA
authors.lastname: Stamos
authors.forename: K F
authors.initials: KF
authors.lastname: Koral