Fig. 5From: Simultaneous PET/MRI with 13C magnetic resonance spectroscopic imaging (hyperPET): phantom-based evaluation of PET quantificationPET activity for all NEMA phantom measurements. Measured PET activity in the largest sphere (blue points) and in a background region of the phantom (black points). Error bars are standard deviations on estimates. For odd PET scan numbers, simultaneous 13C-MRSI was performed, as indicated by the yellow bars Back to article page