Motion correction for PET data using subspace-based real-time MR imaging in simultaneous PET/MR.

ABSTRACT: Image quality of positron emission tomography (PET) reconstructions is degraded by subject motion occurring during the acquisition. Magnetic resonance (MR)-based motion correction approaches have been studied for PET/MR scanners and have been successful at capturing regular motion patterns, when used in conjunction with surrogate signals (e.g. navigators) to detect motion. However, handling irregular respiratory motion and bulk motion remains challenging. In this work, we propose an MR-based motion correction method relying on subspace-based real-time MR imaging to estimate motion fields used to correct PET reconstructions. We take advantage of the low-rank characteristics of dynamic MR images to reconstruct high-resolution MR images at high frame rates from highly undersampled k-space dat

SUBMITTER: Marin T 

PROVIDER: S-EPMC7985095 | biostudies-literature | 2020 Dec

REPOSITORIES: biostudies-literature