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Comparison of Intraarterial and IV Gadolinium-Enhanced MR Angiography with Digital Subtraction Angiography for the Detection of Renal Artery Stenosis in Pigs

Reed A. Omary1, Kevin P. Henseler2, Orhan Unal3, Lawrence J. Maciolek2, J. Paul Finn1, Debiao Li1, Albert A. Nemcek, Jr.1, Robert L. Vogelzang1 and Thomas M. Grist2,3

1 Department of Radiology, Northwestern University Medical School, 676 N. St. Claire St., Ste. 800, Chicago, IL 60611.
2 Department of Radiology, University of Wisconsin-Madison Medical School, 600 Highland Ave., Madison, WI 53792.
3 Department of Medical Physics, University of Wisconsin-Madison Medical School, Madison, WI 53792.



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  		Fig. 1A. —Pig that weighed 20 kg 7 days after surgical induction of bilateral renal artery stenosis. Digital subtraction angiogram shows 70% right (R) renal artery stenosis and 53% left (L) renal artery stenosis.

 


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  		Fig. 1B. —Pig that weighed 20 kg 7 days after surgical induction of bilateral renal artery stenosis. Contrast-enhanced MR angiogram obtained with IV administration of gadodiamide shows 68% right renal artery stenosis and 65% left renal artery stenosis. MR angiogram is coronal maximum intensity projection obtained from three-dimensional (3D) fast-spoiled gradient-echo acquisition.

 


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  		Fig. 1C. —Pig that weighed 20 kg 7 days after surgical induction of bilateral renal artery stenosis. Contrast-enhanced MR angiogram obtained with intraarterial administration of gadodiamide shows 65% right renal artery stenosis and 75% left renal artery stenosis. MR angiogram is a coronal maximum intensity projection obtained from same 3D fast-spoiled gradient-echo acquisition.

 


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  		Fig. 1D. —Pig that weighed 20 kg 7 days after surgical induction of bilateral renal artery stenosis. Magnified source contrast-enhanced MR angiogram obtained with intraarterial administration of gadodiamide shows specific locations used for quantitative stenosis measurements of right renal artery. Small arrow depicts site of stenosis, and large arrow depicts proximal uninvolved normal renal artery segment.

 


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  		Fig. 1E. —Pig that weighed 20 kg 7 days after surgical induction of bilateral renal artery stenosis. Magnified source contrast-enhanced MR angiogram obtained with intraarterial administration of gadodiamide shows specific locations used for quantitative stenosis measurements of left renal artery. Small arrow depicts site of stenosis, and large arrow depicts proximal uninvolved normal renal artery segment.

 


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  		Fig. 2. —Scatterplot shows raw diameter of renal artery stenosis measurements obtained for IV and intraarterial MR angiogram using DSA as reference standard. Note that intraarterial MR angiogram ({blacksquare}) has slightly greater scatter than IV MR angiogram ([UNK]), indicating larger standard deviation for intraarterial stenosis measurements.

 

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