Voxel Based Transmit Gain Calibration Using Bloch-Siegert Shift Method for MR Spectroscopy

Ralph Noeske¹, Rolf Schulte², Timo Schirmer²

The SNR and excitation profile achievable by a localized MR spectroscopy experiment depends on the correct setting of the transmit gain (TG) to assure that the excitation pulses have correct flip angles across the prescribed ROI. Patient dependent spatial B₁⁺-inhomogeneities require a voxel based TG calibration method to achieve this. Automated slice based techniques can yield to B₁-miscalibration degrading excitation profile when B₁-sensitive pulses are used.