Fig. 3
From: Fully automated calculation of image-derived input function in simultaneous PET/MRI in a sheep model
Cross-calibration factor for different sphere radii of the inertia-based vessel-enhancement filter. The cross-calibration factor (Eq. 7) based on the PET-aligned consecutive TOF-MRA data was calculated using different single sphere radii. Smaller radii did not allow an automated vessel segmentation and therefore, yielded no value for cc. The result of the multiscale combination (Eq. 4) is also shown