Dynamic Contrast-enhanced MR Angiography of the Renal Arteries / 实用放射学杂志

ABSTRACT

Objective To evaluate the diagnostic value of dynamic contrast-enhanced MR angiography(DCE MRA)of the renal arteries.Methods 18 patients suspected with renal arterial diseases underwent DCE MR Angiography examinations.After 20 ml(0.15～0.20 mmol/kg)Gd-DTPA being injected quickly via cubital vein,a scaning and data acquisition with coronal three-demensional fast spoiled gradient(FSPGR)sequence was performed in a breath-hold time,the source images were introduced into work station for post processing,including maximum intensity projection(MIP)and multiplanner reconstruction(MPR),finally 3D DCE MRA images were obtained.Results A comparative study on renal artery stenosis and its degree between DCE MR angiography and DSA was done in 25 arteial segments of 12 cases.In 12 normal renal arteries shown by DSA,DCE MRA found 11 normal and one mild stenosis;Four moderate and one severe stenosis was shown by DCE MRA in five renal arteries with moderate stenosis identified by DSA;DCE MRA found five severe stenosis and three occlusion of renal anteries,which had accordance with DSA findings.Conclusion Dynamic contrast-enhanced MR angiography can accurately assess renal arterial diseases,the accuracy was especially higher in patients with severe arterial stenosis and occlusion.