Value of image subtraction in 3D gadolinium‐enhanced MR angiography of the renal arteries
Value of image subtraction in 3D gadolinium‐enhanced MR angiography of the renal arteries
复制标题
图像减影在肾动脉 3D 钆增强 MR 血管造影中的价值
DOI：
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发表时间：
1998
影响因子：
4.4
通讯作者：
J. Debatin
中科院分区：
文献类型：
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作者：
D. Leung;Pia Pelkonen;T. Hany;G. Zimmermann;T. Pfammatter;J. Debatin
本研究旨在定量和定性评价图像减影对肾动脉三维（3D）钆增强MR血管造影图像质量的影响。对20例疑似肾血管性高血压患者进行了屏气3D钆磁共振血管造影（MRA）以及常规肾动脉造影。在动态输注钆-二乙烯三胺五乙酸（Gd-DTPA）之前和期间采集MR血管造影片。对比增强图像与对比增强数据与对比前数据进行逐体素信号强度相减的图像进行比较。以传统血管造影术为金标准，MRA记录了一例明显肾动脉狭窄的假阳性结果。在任何情况下，图像减影均未改变MRA的诊断。与非减影MR血管造影片相比，减影MR血管造影片的平均对比噪声比（CNR）显著更高（P <0.05）。信噪比（SNR）无显著差异。定性分析显示，在远端肾动脉可视化方面，减影后图像质量显著改善。总之，图像减影在CNR和远端肾动脉的可视化方面提高了肾MRA的质量。
The objective of this study was to evaluate quantitatively and qualitatively the effect of image subtraction on the image quality of three‐dimensional (3D) gadolinium‐enhanced MR angiograms of the renal arteries. Breath‐hold 3D gadolinium MR angiography (MRA) as well as conventional contrast angiography of the renal arteries was performed on 20 patients with suspected renovascular hypertension. MR angiograms were acquired before and during dynamic infusion of gadolinium‐diethylenetriamine pentaacetic acid (Gd‐DTPA). Contrast‐enhanced images were compared with images that had undergone voxel‐by‐voxel signal intensity subtraction of contrast‐enhanced data from precontrast data. One false positive finding for significant renal artery stenosis was recorded with MRA using conventional angiography as the gold standard. Image subtraction did not alter the diagnosis at MRA in any case. The mean contrast‐to‐noise ratio (CNR) was significantly higher (P < .05) on the subtraction MR angiograms compared to the nonsubtracted MR angiograms. There was no significant difference in the signal‐to‐noise ratio (SNR). Qualitative analysis revealed a significant improvement in image quality after image subtraction with respect to visualization of the distal renal arteries. In conclusion, image subtraction improves the quality of renal MRA in terms of both CNR and visualization of the distal renal arteries.
影响因子：
19.7
作者：
PRINCE, MR;NARASIMHAM, DL;CHO, KJ
通讯作者：
CHO, KJ