Linda Becker1,
Wolfgang Dreher1, Dieter Leibfritz1
1Dept. Chemistry,
A
variation of the SSFP-based fast spectroscopic imaging technique spFAST is
presented. By flip angle variation the specific absorption rate (SAR) can be
reduced considerably with only a minor loss in the signal-to-noise ratio
(depending on the relaxation times). Additionally, the oscillating signal
intensities can be exploited for k-space weighting in one spatial phase
encoding direction which enables better spatial localization. Simulations and
experiments at 7T showed that a gaussian flip angle series offers good
results for all tested relaxation times.
Keywords