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Axial renal perfusion images obtained by (a) dual navigator (both NAV1 and NAV2) gated, (b) NAV1 gated only, (c) NAV2 gated only, and (d) ungated acquisition for a healthy volunteer. Only for the dual navigator case, the kidney cortex is well delineated and the perfusion values are in agreement with previous investigations. Also, only for this case are the perfusion values in the same range for the right and the left kidney.
