A 3D MR-acquisition scheme for non-rigid bulk motion correction in simultaneous PET-MR

Positron emission tomography (PET) is commonly used to detect tumours and assess the progress of cancer treatment by measuring standardized uptake values (SUV). Physiological motion such as bulk-motion shifts during data acquisition can negatively impair obtained SUV. Here we evaluate a simultaneous PET-MR acquisition to detect and correct for any non-rigid bulk motion shifts directly from acquired gradient or spin echo MR data without the need of additional motion information. Volunteer studies show an accuracy of 1.71 0.29mm for the obtained motion information reducing SUV errors in motion corrected PET simulations from 65% to below 10%.

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