Abstract #0885
Will field shifts due to head rotation compromise motion correction?
Aleksandra Sulikowska 1 , Samuel Wharton 1 , Paul M Glover 1 , and Penny A Gowland 1
1
Sir Peter Mansfield Magnetic Resonance
Centre, University of Nottingham, Nottingham,
Nottinghamshire, United Kingdom
We have characterised the size and locations of the
maximum B0 field shifts within the brain at 7T for head
pitch and roll angles in order to determine how these
may be accounted for in motion correction. B0 difference
maps of the brain were acquired from 5 healthy
volunteers, each being imaged at 4 different head
orientations. Eight small VOIs located at the positions
of the largest observed field changes were analysed for
each subject. The B0 field difference maps are spatially
similar across all subjects and the magnitude of shift
shows a linear dependence on the angle of both pitch and
roll. The maximum frequency shift occurs in the frontal
lobe during pitch where the sensitivity is -1.320.02
Hz/degree.
This abstract and the presentation materials are available to members only;
a login is required.
Join Here
