Fig. 6
From: Image quality and detectability in Siemens Biograph PET/MRI and PET/CT systems—a phantom study
PET images from the PET/MRI and PET/CT with 8:1 activity concentration for increasing acquisition times. Contrast-to-noise ratio (CNR) and observer scores (OS) for the hot spheres with a diameter of 4 mm and 5 mm are presented in red when the sphere was defined as non-detected and in green when the sphere was defined as detected. PET/MRI images are reconstructed with OSEM with PSF, while PET/CT images are reconstructed with OSEM with PSF and TOF, all with 3 iterations and 2 mm voxel size