Hd truex

PET imaging studies were performed on a Biograph TrueV (Siemens Medical Solutions). ¹⁸F-FDG injection was preceded by a 6-h fasting period and a 15-min rest in a warm room. Patients were scanned 60 min after ¹⁸F-FDG injection from the skull base to the mid-thighs (2 min 40 s per bed position for normal-weight patients (BMI ≤ 25 kg/m²) and 3 min and 40 s per bed position for patients with BMI > 25 kg/m²). Images were reconstructed using a point spread function (PSF) algorithm (HD; TrueX, Siemens Medical Solutions, 3 iterations and 21 subsets) with no post-filtering (PSF_WholeBody) and a 168² matrix size leading to a voxel size of 4.1 × 4.1 × 5.0 mm. A complementary high-resolution (HR) breast dedicated bed position (6 min per bed position) was performed just after the completion of the skull base to the mid-thighs acquisition. Images were reconstructed using the same protocol as above (PSF_breast) and an ordered subset expectation maximization (OSEM) algorithm (four iterations, eight subsets) with a Gaussian post-filtering of 5 mm (OSEM_breast) with a 512² matrix size leading to voxels of 1.3 × 1.3 × 1.9 mm. Scatter and attenuation corrections were applied for both acquisitions.