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Abstract #3778

Correction Method for Thin Slice Spectral Spatial RF Pulses

Yuval Zur1

1GE Healthcare, Haifa, Israel

Spectral spatial (spsp) RF pulses are used for simultaneous fat suppression and slice selective excitation. However, spsp pulses are very sensitive to RF gradient delay and eddy currents. We present a correction method, such that spsp pulses are, in practice, not sensitive to system imperfections. This correction enables practical use of spsp RF pulses with slice width of 1.5 mm at high field strength (3T).

Keywords

accuracy accurately achieved adding adjacent amplitude applied apply artifacts assuming avoid bandwidth become calibration circles clinical coherent compensate compensated compensating compensation concert confirms constant constants correct correction correctness created creates decrease decreases delay delays design desired determined diameter distance eddy eliminate even excitation excite feasible field fitted fitting free frequency full global gradient gradients hardware hence improve improved independent known limited linear magnitude many measure measured mismatch must need nerve normalized numerical omega originate peripheral phantom planar played position positions powerful practical practice prescribed press proceedings product profile proportional pulses real recipes reduce reliable remove represented require requires restore rise routine running scaled select selective separation sets shot simple simplex simultaneous slew slice slices smaller spatial spectral squares stable stimulation straight strength suppressed suppression system theory thin trajectory uncompensated unsuppressed water waveform widely width written zero