Chaiya Luengviriya1,2, Jian Yun1, Kuan Lee3, Julian Maclaren3, Oliver Speck1
1Department of Biomedical Magnetic Resonance, Otto-von-Guericke University, Magdeburg, Germany; 2Department of Physics, Kasetsart University, Bangkok, Thailand; 3Department of Diagnostic Radiology, University Hospital Freiburg, Freiburg, Germany
Image artifacts induced by subject motion during multi-channel MRI were simulated for different sensitivity map profiles and different amounts of abrupt random motion. More localized maps resulted in stronger artifacts in the images. Two procedures for retrospective motion correction, k-space signal correction and sensitivity map correction were applied during an iterative non-Cartesian SENSE reconstruction. The signal correction evidently reduced the artifacts. The sensitivity map correction further improved image quality for strong motion and highly localized maps, at the cost of a longer computation time. For small motion and less localized maps, sensitivity map correction can be avoided since no improvement was visible.