Aaron Timothy Hess1, Ovidiu C. Andronesi2,3,
Matthew Dylan Tisdall2,3, Ernesta M. Meintjes1,4, Andre
J. van der Kouwe2,3
1University of Cape Town, Cape Town,
South Africa; 2Martinos Center for Biomedical Imaging,
Massachusetts General Hospital, MA; 3Department of Radiology,
Harvard Medical School, MA; 4MRC/UCT Medical Imaging Research Unit
Real
time measurement of the B0 field using an EPI navigator is presented, its use
in real time first order shim correction for LASER spectroscopic imaging is
demonstrated. Homogeneity of the B0 field is important in spectroscopy and
spectroscopic imaging and thus, by measuring the B0 field in real time,
changes to the linear shim gradients and frequency offset are corrected on
the fly. This technique is shown to minimise line broadening due to motion
induced B0 changes.