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. Author manuscript; available in PMC: 2017 Mar 1.
Published in final edited form as: NMR Biomed. 2015 Dec 8;29(3):256–263. doi: 10.1002/nbm.3455

Figure 1.

Figure 1

Overview of preparation steps for native and NOE-enhanced 31P MRSI and data analysis in one subject. A: Transversal absolute 1H B1+ map after B1+ calibration to obtain at least 90° flip angles in the posterior part of the brain, allowing minimally 30 Hz NOE power. B: Sagittal MPRAGE image. The location of the absolute 1H B1+ map is indicated by the red line and the slice selection for flip angle calibration of 31P is indicated by the white lines. The yellow arrows indicate signal dropout due to low B1+. C: Transversal MPRAGE images with the spectroscopic grid as an overlay. The voxels indicated in blue were used for data analysis. The approximate real voxel size is indicated by the yellow dotted circle.