Fig. 7From: Image quality and detectability in Siemens Biograph PET/MRI and PET/CT systems—a phantom studyHistograms of contrast-to-noise ratio (CNR) for detected (green) and non-detected (red) spheres for a PET/MRI and b PET/CT for all the reconstructions with similar number of true counts for the two systems. The black line represents CNR = 5 (Rose criterion). There are twice as many reconstructions for the PET/CT than for the PET/MRI due to the TOF optionBack to article page