title: [Basic evaluation of sampling step angle and spatial resolution in continuous rotating acquisition with SPECT].
abstract: In the data sampling in single photon emission computed tomography (SPECT), the continuous rotating acquisition method has high clinical utility. There have been various reports about the optimum sampling step angle for continuous rotating acquisition. Objective evaluation was performed visually and by measuring spatial resolution with a column phantom to find the optimum sampling step angle for continuous rotating acquisition. In locations far from the rotation center, a large sampling step angle produced artificial images with tangential elongation. The spatial resolution was 11.58 ± 0.19 mm full width half maximum (FWHM) as measured at a sampling step angle of 3 degrees and at 10 cm away from the rotation center. Increasing the sampling step angle to more than 3 degrees resulted in an increase of FWHM in the tangential direction. The optimum sampling step angle for continuous rotating acquisition in SPECT needs to be below that calculated from the sampling theorem.
authors.affiliation: Department of Radiology, Kawasaki Medical School Hospital.
authors.forename: Yoshiharu
authors.initials: Y
authors.lastname: Kangai
authors.forename: Akio
authors.initials: A
authors.lastname: Nagaki
authors.forename: Norikazu
authors.initials: N
authors.lastname: Matsutomo
authors.forename: Shuichi
authors.initials: S
authors.lastname: Sugino
authors.forename: Yasushi
authors.initials: Y
authors.lastname: Ohata
authors.forename: Hiroaki
authors.initials: H
authors.lastname: Mimura
authors.forename: Hideo
authors.initials: H
authors.lastname: Onishi
mesh_terms: D019047:Phantoms, Imaging; D015899:Tomography, Emission-Computed, Single-Photon / Q000295:instrumentation / Q000379:methods*