Computed tomography perfusion (CTP) is a validated method for assessment of single-kidney renal blood flow (RBF), but is limited by the use of exogenous contrast (i.e. iodine) injection and ionizing radiation. Arterial Spin Labeling (ASL)-MRI is an emerging technique that quantitatively measures RBF without any contrast agents or ionizing radiation. We compared renal perfusion (RBF/gram tissue) obtained using CTP and ASL-MRI in the left and right cortex and medulla of the same pigs (n=6), and observed a linear fit of ASL-MRI = 0.24*CTP+0.42 ml/ml/min with correlation r2=0.71.
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