Dynamic Contrast Enhanced CT in Kidneys of Dogs

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  • 犬における腎臓造影CT撮像法
  • イヌ ニ オケル ジンゾウゾウエイ CT サツゾウホウ

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Abstract

This study aimed to evaluate the protocol for contrast-enhanced CT of the canine kidney. Healthy beagle dogs underwent multiphase enhanced CT scans of the kidney using the bolus-tracking method. The contrast agent (iohexol, 750 mgI/kg) was injected for 15 seconds. The first scan using the bolus-tracking method was performed immediately after contrast agent administration. The scans were then carried out 40, 60, 90, 120, 180, and 300 seconds after administration. We measured the CT numbers in the renal artery, vein, cortex, and medulla, along with those of the pelvis and ureter at each time interval. The renal vascular phase, cortical nephrographic phase, parenchymal nephrographic phase, and excretory phase were reached, approximately, 17 and 19, 40 and 60, 90 and 120, and 180 and 300 seconds after intravenous contrast agent administration,respectively. There is good correlation between heart rate and the duration of achieving the 150-HU value of ROI after intravenous contrast agent administration. In conclusion, we suggest that a clear image of the kidney can be obtained by multiphase contrast-enhanced CT using the bolus-tracking method.

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