Figure 4. Experimental readout-segmented 2D images in a healthy subject: Top row) single-transmit, Middle row) volumetric-B₁⁺ shimming, and Bottom row) slice-by-slice B₁⁺ shimming. The arrows highlight a few areas where slice-by-slice shimming mitigates the B₁⁺ inhomogeneity particularly well compared to single-transmit and volumetric-shimming. Meanwhile, there is a global improvement in the column 4 slice. Each column of slice images are windowed the same.

Figure 2. Magnitude RF waveforms in volts for 8 transmit channels, excitation pulse on the left and refocusing pulse on the right. Top row) single-transmit waveforms (all channels same magnitude with incremental 45° phase offset); Second row) volumetric-shim waveforms (in this case, the shimmed solution alternated between two magnitude values on all channels); Third row) slice 1 shim waveforms; Fourth row) slice 4 shim waveforms.