Alan Chu1, Yulin Chang2, André J. W. van der Kouwe3, and M. Dylan Tisdall1
1Radiology, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA, United States, 2Siemens Medical Solutions USA, Inc., Malvern, PA, United States, 3Athinoula A. Martinos Center for Biomedical Imaging, Massachusetts General Hospital, Charlestown, MA, United States
1Radiology, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA, United States, 2Siemens Medical Solutions USA, Inc., Malvern, PA, United States, 3Athinoula A. Martinos Center for Biomedical Imaging, Massachusetts General Hospital, Charlestown, MA, United States
We demonstrate the
feasibility and validity of field mapping using a dual-echo vNav based on a
fly-back EPI readout.
Sagittal field maps
generated from the multi-echo FLASH and dual-echo vNav acquisitions shown in Hz.
The FLASH field maps were downsampled by a factor of 4 to match the resolution
of the vNavs for easier comparison. Note that the field map values have not
been unwrapped, so may not be entirely comparable in regions of very high
susceptibility due to differences in echo timing between the FLASH and vNav
scans.
Sagittal views of magnitude
images from the FLASH and vNav scans, for each of the first and second runs. For
the first run, the subject's head was held in a fixed neutral position, and for
the second run, the subject's head was held in a fixed upward nodding position.
