In vivo B0 inhomogeneity maps were generated from the WASSR experiment performed before the injection for each mouse. WASSR Z-spectra for ROIs drawn over both the kidneys were extracted and interpolated in MATLAB using cubic spline interpolation. The water shift was measured pixel by pixel, as described previously, to obtain the ΔB0 maps over the kidney. ΔB0 maps were overlaid on the corresponding high-resolution T2W images to obtain the ΔB0 maps shown in fig. S6.

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