T 1 - and TR-Independent B 1 + Mapping by Bloch-Siegert Shift for 7T Human Cardiac 31 P-MRS
William T Clarke 1 , Matthew D Robson 1 , and Christopher T Rodgers 1
OCMR, RDM Cardiovascular Medicine,
University of Oxford, Oxford, United Kingdom
at 7T suffers from low peak B
, making B
adiabatic or composite pulses impossible. Accurate B
are required to correct partially saturated metabolite
amplitudes and ratios. Long T
s and 3D-CSI
acquisition makes magnitude B
approaches infeasible. Bloch-Siegert shift B
is insensitive to metabolite T
s and sequence
TR. In this work Bloch-Siegert mapping is validated
against gold standards in phantoms and against a
previously published dual TR method in skeletal muscle.
The feasibility of the approach for cardiac
is demonstrated in a single subject.
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