The performance characteristics of the Philips Gemini PET/CT scanner Attenuation free values of sensitivity were 3,620 counts/sec/MBq at the center of transaxial FOV and 4,324 counts/sec/MBq at 10 cm offset Transverse radial, transverse tangential, and axial resolution at 10 cm were (1) 5.7, 5.7, and 7.0 mm (FBP), (2) 5.4, 5.4, and 6.4 mm (3D RAMLA). Transverse and axial resolutions at 1 cm radius were (1) 5.3 and 6.5 mm (FBP), (2) 5.1 and 5.9 mm (3D RAMLA). Scatter fraction was determined by averaging the true to background ratio of last 3 frames in which the dead time loss was below 1%. Oblique sinograms were collapsed into transaxial slices using single slice rebinning method, and true to background (scatter + random) ratio for each slice and frame was estimated. To measure NECR and scatter fraction, 1110 MBq of F-18 solution was injected into a NEMA scatter phantom with a length of 70 cm and dynamic scan with 20-min frame duration was acquired for 7 half-lives. Data for sensitivity measurement were acquired using NEMA sensitivity phantom filled with F-18 solution and surrounded by 1âˆ❅ aluminum sleeves after we confirmed that dead time loss did not exceed 1%. For the measurement of spatial resolution, images were reconstructed with FBP using ramp filter and an iterative reconstruction algorithm, 3D RAMLA.

PET data to measure spatial resolution, sensitivity, scatter fraction, and NECR were acquired in 3D mode according to the NEMA NU2 protocols (coincidence window: 8 ns, energy window : 409âˆ❆64 keV). The PET scanner has 28 detector segments which have an array of 29 by 22 GSO crystals (4*6*20 mm), covering axial FOV of 18 cm. GEMINI is composed of the Philips ALLEGRO PET and MX8000 D multi-slice CT scanners. In this study, performance of the scanner including spatial resolution, sensitivity, scatter fraction, noise equivalent count ratio (NECR) was measured utilizing NEMA NU2-2001 standard protocol and compared with performance of LSO, BGO crystal scanner. Philips GEMINI is a newly introduced whole-body GSO PET/CT scanner. Kim, Jin Su Lee, Jae Sung Lee, Byeong Il Lee, Dong Soo Chung, June Key Lee, Myung Chul International Nuclear Information System (INIS) Performance characteristics of 3D GSO PET/CT scanner ( Philips GEMINI PET/CT)

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