Real-time B0 and first order shim correction during motion correction with cloverleaf navigators
van der Kouwe A, Benner T, Dale A
Massachusetts General Hospital
Various types of navigators have been used for rigid body motion correction and shim correction during imaging. We demonstrate that cloverleaf navigators can be used to achieve real-time rigid body motion correction as well as real-time tracking of zero and first order B0 changes (frequency and linear shim changes) due to effects such as subject motion, breathing and scanner frequency drift. We show that B0 tracking improves the accuracy of the motion estimates and therefore also improves image quality indirectly.