BOLD MRI of the Kidneys under water loading at 7 Tesla using parallel Transmission and RF Shimming of individual slices

BOLD MRI of the kidneys has been proposed to determine renal oxygenation through the measurement of R2* changes during water loading. In this work we report first preliminary results of renal BOLD MRI at 7T using a dedicated parallel transmission coil setup. To increase the B1+ homogeneity at kidney region the B1+ profile was shimmed successfully by more than 30%. The measurements were done with a multi-echo 2D FLASH sequence. The experiments show strong changes of R2* in the renal medulla and cortex both at baseline and during water loading which facilitates the detection of the R2* changes at 7T.

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