Korean J Radiol.  2008 Apr;9(2):128-133. 10.3348/kjr.2008.9.2.128.

Power Doppler Imaging in Acute Renal Vein Occlusion and Recanalization: a Canine Model

• Yoo SY
• Kim IO
• Kim YI
• Lee KH
• Lee MW
• Youn BJ
• Kim WS
• Yeon KM

• KMID: 1098191
• DOI: http://doi.org/10.3348/kjr.2008.9.2.128

Abstract

OBJECTIVE
To evaluate the dynamic changes of the power Doppler (PD) in acute renal vein occlusion and recanalization in a canine model. MATERIALS AND METHODS: We performed a PD of the kidney during graded renal vein occlusion and recanalization induced by balloon inflation and deflation in nine dogs. The PD images were transferred to a personal computer, and the PD signals were quantified. RESULTS: We observed the temporal change of the PD signal during renal vein occlusion and recanalization, with a decrease in the PD signal during occlusion and an increase during recanalization. The mean PD signal decreased gradually as the renal vein was occluded, and conversely increased gradually with sequential relief of occlusion. The sequential change of the mean value of the PD signal was statistically significant. CONCLUSION: The PD can detect a change in renal blood flow during acute renal vein occlusion and recanalization in a canine model. The PD may be used as a helpful tool for the early detection of acute renal vein thrombosis and the monitoring of renal perfusion.

Keyword

Renal vein; Renal vein thrombosis; Power Doppler; Ultrasonography

MeSH Terms

Acute Disease
Animals
Balloon Dilatation
*Balloon Occlusion
Blood Flow Velocity
Disease Models, Animal
Dogs
Image Processing, Computer-Assisted
Kidney/*blood supply/ultrasonography
Renal Veins/*ultrasonography
*Ultrasonography, Doppler

Figure

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  Fig. 1 Analysis of the power Doppler signal using quant PDI®. Upon manual delineation of region of interest along border of kidney, power values within region of interest as histogram (open arrow) and set of local statistical power Doppler features (curved arrow) are calculated and displayed. Note segmented image (arrow) in which gray scale component of power Doppler image was discarded.

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  Fig. 2 Sequential change of the longitudinal power Doppler image of same region of dog kidney, during graded renal vein occlusion and recanalization. Baseline (A), partial occlusion (B), complete occlusion (C), partial recanalization (D), complete recanalization (E), and removal of catheter (F).

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  Fig. 3 Time course analysis of power Doppler signal during graded renal vein occlusion and recanalization in a dog. Note decrease of power Doppler signal during occlusion as well as increase in power Doppler signal during recanalization.

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  Fig. 4 Sequential change in mean power Doppler signal during graded renal vein occlusion and recanalization in nine dogs. Bars indicate largest and smallest value in each step. X-axis indicates occlusion state of renal vein, which includes baseline, partial occlusion, complete occlusion, partial recanalization, complete recanalization, and removal of catheter, respectively. Change was statistically significant (p < 0.01).

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  Fig. 5 Line graphs showing sequential changes in resistive index during graded renal vein occlusion and recanalization in nine dogs.

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