Markerless motion tracking and correction for PET, MRI, and simultaneous PET/MRI
Fig 7
Axial image slices from the 3D FLASH scans of subjects (a) and (b).
The motion performed during the acquisition corresponds to the graphs in Fig 6 subject (a) and (b), respectively. The four scan images representing scans with and without motion and with and without motion correction (MC): A: No motion, MC OFF, B: Motion, MC OFF, C: No motion, MC ON, and D: Motion, MC ON. The absolute difference between scans are present in the last row and column for both subjects. These are visualized using the same mapping from pixel intensities to grey scale values as in the MRI images. For both subjects image B show degraded image quality resulting from motion. Image D shows the improved image quality as a result of the prospective MC.