Meeting Banner
Abstract #1733

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

Ralph Noeske1, Rolf Schulte2, Timo Schirmer2

1Research and Collaboration, GE Healthcare, Berlin, Germany; 2GE Global Research, Munich, Germany

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.

Abstract PDF

Keywords

achieve acquisition action around assure assures auto automated averaging better blue body bottom brain breasts broadband calibration changing chemical coil collaboration combination correct default demons dependent depends derived desired determined deviates done element embedded encodes error especially excitation excited expected experiment finally fixed flatter frequency fully gain gives global gradient head identical implementation included induced introduced king largely last located mapping metrically modifying much optimal phantom placed pres press proceedings process processing profile prone proposed pulse pulses quadrature rang ranging receive recently reduce reduced refocusing sensitive sent setting settings siege significantly sing slice spatial spec spectroscopy sphere spin starting supports symmetrical totally transmit various volume water whole wrong yield