Tanaka Yoshitaka, Takeuchi Takashi, Kodama Hiroyasu, Odagiri Hayato
Department of Radiological Technology, Tohoku University Hospital.
Department of Diagnostic Image Analysis, Tohoku University Graduate School of Medicine.
Nihon Hoshasen Gijutsu Gakkai Zasshi. 2025;81(10). doi: 10.6009/jjrt.25-1542.
StarGuide (GE HealthCare, Haifa, Israel), a full-ring SPECT/CT system using Cadmium Zinc Telluride (CZT) technology, allows detectors to perform a pendulum motion (sweep) during SPECT acquisition. It offers two sweep modes: continuous and step and shoot, and we investigated the impact of different sweep modes on spatial resolution and image uniformity.
Spatial resolution was evaluated using the full width half maximum (FWHM) of line source images. Image uniformity was assessed using the root mean square uniformity (%RMSU) of pool phantom images. Image reconstruction was performed using the 3D-OSEM method. Attenuation correction and spatial resolution correction were applied, and no filters were used during the reconstruction process.
FWHM at the center of rotation with update 500 was 5.60±0.13 mm for continuous and 4.40±0.15 mm for step and shoot. %RMSU with update 100 was 8.94±0.38% for continuous and 9.23±0.35% for step and shoot.
Using the step-and-shoot sweep mode can maintain high spatial resolution.
