Rotation estimation for cloverleaf navigators using a k-space map simulation
Tamsin Edwards Lambourne1,2, André J. W. van der Kouwe1,3, and Robert Frost1,3
1Athinoula A. Martinos Center for Biomedical Imaging, Department of Radiology, Massachusetts General Hospital, Charlestown, MA, United States, 2Northeastern University, Boston, MA, United States, 3Department of Radiology, Harvard Medical School, Boston, MA, United States
Short <5 ms cloverleaf navigators have been demonstrated for prospective motion correction at a rate of 71 Hz in steady-state FLASH. The original cloverleaf approach required a 12 second k-space mapping pre-scan to reliably deal with out-of-plane rotations. Here we investigate simulation of a k-space map based on a low spatial resolution pre-scan. The approach shows potential for real-time detection of rigid-body rotation in the context of real-time self-correction of the cloverleaf orientation.
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