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Using a whole-body ³¹P birdcage transmit coil and 16-element receive array for human cardiac metabolic imaging at 7T

Fig 4

In vivo B₁⁺ mapping.

(a) Representative Bloch-Siegert, 2D, transverse B₁⁺ map overlaid on ¹H localizer image registered to the CSI grid. (b) A histogram of measured B₁⁺ variability across all four subjects normalized to individual subject median B₁⁺. A fitted normal distribution function (red line) is also depicted. All voxels with sufficient SNR were used for analysis.

doi: https://doi.org/10.1371/journal.pone.0187153.g004