Fig. 2From: Using 31P-MRI of hydroxyapatite for bone attenuation correction in PET-MRI: proof of concept in the rodent brainMRI and CT images acquired on the cortical bone sample. 1H anatomical MRI (a), 31P-ZTE MRI (b), fusion (c), and low-resolution CT (d). Note that the rectangular structure in hyposignal located in the center of the inverted U-shape bone in a is a piece of plastic used to position the bone sample on top of the tubeBack to article page