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.
Keywords