Wei Lin1, Tim Nielsen2, Qin Qin3, 4, Stewart H. Mostofsky5, George Randy Duensing1
1Invivo Corporation, Philips Healthcare, Gainesville, FL, United States; 2Philips Research Europe, Hamburg, Germany; 3Radiology, The Johns Hopkins University, Baltimore, MD, United States; 4F.M. Kirby Research Center, Kennedy Krieger Institute, Baltimore, MD, United States; 5Neurology and Psychiatry, The Johns Hopkins University, Baltimore, MD, United States
A real-time strategy for 3D rigid-body motion correction in 2D multi-slice multi-shot MRI scans is proposed. Two through-plane navigator (tNav) echoes are collected on each imaging slice to derive two tNav projection images within each TR. Rotation/translation within each tNav image plane is detected using an image correlation measure. Rotation within the imaging plane is detected by replacing tNav with an orbital navigator on one slice. The proposed method does not introduce any additional 3D RF excitation, and does not require any additional hardware. The efficacy of the proposed method is demonstrated with in vivo brain studies.