Impact of Sweep Motion in a Full-ring Semiconductor SPECT/CT System on Image Quality: Evaluation through Phantom Experiments

Le résumé fourni par la source

PURPOSE: 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. METHODS: 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. RESULTS: 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. CONCLUSION: Using the step-and-shoot sweep mode can maintain high spatial resolution.

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