Biograph horizon truev fdg pet ct system

PET/CT scans were obtained using a Biograph Horizon TrueV FDG-PET/CT system (Siemens Medical Solutions, Knoxville, TN, USA). This system has 52 detector rings consisting of 160 blocks, with each block containing an array of 13 × 13 lutetium oxyorthosilicate crystals (4 mm × 4 mm × 20 mm) covering an axial FOV of 221 mm and a transaxial FOV of 690 mm diameter. A CT scan was performed for attenuation correction (130 kV; 15–70 mA; tube rotation time, 0.6 s per rotation; pitch, 1; a transaxial FOV, 700 mm; and section thickness, 5 mm).

All the patients fasted for at least 6 h before ¹⁸F-FDG (3 MBq/kg) administration. Whole-body PET/CT scans were performed at 60-min post injection using a Biograph Horizon TrueV FDG-PET/CT system (Siemens Medical Solutions, Knoxville, TN, USA). The coincidence-timing window and time-of-flight system-timing resolution were 4.1 ns and 540 ps, respectively. A CT scan was performed for attenuation correction (tube voltage, 130 kV; tube current, 15–70 mA; tube rotation time, 0.6 s per rotation; pitch, 1; transaxial field of view [FOV], 700 mm; and section thickness, 5 mm). The PET/CT images were reconstructed using the ordered subset expectation–maximization method and time-of-flight algorithm with 4 iterations and 10 subsets. The CT data were resized from a 512 × 512 matrix to a 180 × 180 matrix to match the PET data and construct the CT-based transmission maps for attenuation correction of the PET data with a post-reconstruction smoothing Gaussian filter (5-mm FWHM). The reconstructed voxel size of the PET/CT images was 4.11 × 4.11 × 5 mm.

Whole-body PET/CT scans were obtained using a Biograph Horizon TrueV FDG-PET/CT system (Siemens Medical Solutions, Knoxville, TN, USA). This system has 52 detector rings consisting of 160 blocks. Each block containing an array of 13 × 13 lutetium oxyorthosilicate crystals (4 mm × 4 mm × 20 mm) covering an axial FOV of 221 mm and transaxial FOV of 690 mm. A CT scan was performed for attenuation correction (130 kV; 15–70 mA; tube rotation time, 0.6 s per rotation; pitch, 1; transaxial FOV, 700 mm; and section thickness, 5 mm).