Abstract #2654

Motion correction of PET images using Spherical Navigator echoes (SNAVs) on a hybrid PET-MR scanner

Patricia Johnson^1,2, Reggie Taylor^3,4, Tim Whelan¹, and Maria Drangova^1,2

¹Robarts Research Institute, London, ON, Canada, ²Medical Biophysics, Western University, London, ON, Canada, ³Lawson Health Research Institute, London, ON, Canada, ⁴Siemens Canada, Oakville, ON, Canada

Head motion during brain imaging with hybrid PET-MR degrades the quality of both the PET and MR images. Simultaneous acquisition with the two modalities provides the opportunity for MR motion measurement techniques to be used for correction of PET data. In this study, spherical navigator echoes (SNAV) were used for retrospective motion correction of PET images. A phantom was repositioned several times during a list mode acquisition. The list mode data was binned into motion states based on the SNAV measured motion, and a motion-corrected PET reconstruction was performed. SNAV motion correction successfully removed blurring in the PET images.

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