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- W75244301 abstract "1545 Objectives Assess the PET imaging performance of the GEMINI TF Big-Bore PET/CT system, with attention to the effects of a larger transverse imaging field of view and reduced bore shielding. Methods Spatial resolution is measured in a method similar to NEMA NU-2 2007, with additional measurements out to the edge of a 67-cm diameter field of view. Spatial, timing and energy resolution are measured over a wide range of singles rate. Scatter fraction (SF) and noise-equivalent count rate (NECR) are measured per NEMA specifications with additional measurements using 27- and 35-cm object diameters. Contrast recovery and background variability are measured using hot and cold spheres in standard IEC body and larger phantoms. Additional measurements of scatter fraction versus energy window are in progress. Results Resolutions behaved in a manner consistent with the standard-bore GEMINI TF system. SF measured 31% following the NEMA method, and 47% with a 27-cm phantom, and NECR peaked at 85 and 44 kcps. Contrast recovery for 10, 13, 17 and 22-mm diameter spheres at 4:1 uptake was measured as 40, 51, 63, and 69% with corresponding background variability of 6, 6, 5, and 4%. In a challenging 35-cm diameter cylindrical phantom, contrast recovery was measured as 20, 39, 53, and 65% and the background variability was 13, 11, 10, and 8%. Conclusions Early performance results indicate that a reduction in bore shielding has a small but measurable effect on SF and NECR, and effects on image noise are less significant. Contrast recovery and spatial resolution are similar to the values for the standard-bore system." @default.
- W75244301 created "2016-06-24" @default.
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- W75244301 date "2009-05-01" @default.
- W75244301 modified "2023-09-24" @default.
- W75244301 title "Performance characteristics of a large bore PET/CT scanner" @default.
- W75244301 hasPublicationYear "2009" @default.
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