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Underestimation of Renal Cortical Perfusion Calculated from Dynamic CT Data

Yoshito Tsushima, MD,*, Jun Aoki, MD and Keigo Endo, MD

Department of Radiology, Motojima General Hospital, 3-8 Nishi-Honcho, Ohta, Gunma 373-0033, Japan* e-mail: yoshito@xa2.so-net.ne.jp
Department of Diagnostic Radiology and Nuclear Medicine, Gunma University Hospital, Gunma, Japan

View larger version (95K): [in a new window]   Figure 1. Dynamic CT image obtained at 8 seconds after initiation of image acquisition in a 23-year-old woman with a pancreatic head tumor shows left renal vein enhancement (long arrow); however, no enhancement of the portal vein (short arrow) is shown.

View larger version (39K): [in a new window]   Figure 2. Time-attenuation curves demonstrate that renal vein enhancement was observed at the time of the peak upward slope (arrow) of the left renal cortex. Note that portal venous enhancement started later than the enhancement in the renal vein.