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首页> 外文期刊>Radiology >Renal arteries: optimization of three-dimensional gadolinium-enhanced MR angiography with bolus-timing-independent fast multiphase acquisition in a single breath hold (see comments)
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Renal arteries: optimization of three-dimensional gadolinium-enhanced MR angiography with bolus-timing-independent fast multiphase acquisition in a single breath hold (see comments)

机译：肾动脉：通过单次屏气进行单次推注时机独立的快速多相采集，优化三维g增强的MR血管造影（参见评论）

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摘要

PURPOSE: To compare two different three-dimensional (3D) gadolinium-enhanced magnetic resonance (MR) angiographic techniques. MATERIALS AND METHODS: In 26 patients suspected of having renal artery stenosis, results with fast multiphase 3D MR angiography were compared to those with standard 3D MR angiography in 37 patients. With both techniques, 31-second breath-hold acquisitions were performed. Multiphase angiography comprised five discrete 6.4-second acquisitions without bolus timing, and standard angiography comprised a single acquisition based on test-bolus timing. Two readers evaluated images obtained with both techniques in terms of image quality, artifacts, and vessel conspicuity. Accuracy of findings on the multiphase 3D MR angiograms for assessment of renal artery stenosis was determined by comparing them to digital subtraction angiograms and surgical findings. RESULTS: In the early arterial phase, multiphase 3D MR angiograms showed no image degradation by venous overlay, whereas standard 3D MR angiograms depicted at least minor overlay in 53 of 83 renal arteries (P < .001). Less parenchymal enhancement in the early arterial phase resulted in a higher vessel conspicuity for the divisions and segmental arteries (P < .001). Both readers detected and correctly graded 18 of 20 stenoses on the multiphase angiograms with almost perfect interobserver agreement (kappa > 0.89). CONCLUSION: Renal multiphase 3D MR angiography is an accurate technique requiring no bolus timing. The performance of early arterial phase imaging leads to improved depiction, particularly of the distal renovascular tree, compared to that with standard single-phase 3D MR angiography.
机译：目的：比较两种不同的三维（3D）lin增强磁共振（MR）血管造影技术。材料与方法：在26例怀疑有肾动脉狭窄的患者中，将37例快速多相3D MR血管造影与标准3D MR血管造影的结果进行了比较。两种技术均执行了31秒屏气采集。多相血管造影包括五个离散的6.4秒采集，没有推注定时，而标准血管造影包括基于测试推注定时的单个采集。两名读者评估了通过两种技术获得的图像的图像质量，伪像和血管显眼性。通过将多相3D MR血管造影照片与数字减影血管造影照片和手术结果进行比较，确定了评估肾动脉狭窄的3D MR血管造影照片的准确性。结果：在动脉早期，多相3D MR血管造影显示没有静脉覆盖引起的图像退化，而标准3D MR血管造影描述了83个肾动脉中的53个中至少有较小的覆盖（P <.001）。早期动脉实质的增强较少，导致血管对分隔动脉和节段动脉的显着性更高（P <.001）。两位读者均在多相血管造影上检测到20个狭窄中的18个，并以几乎完美的观察者相互吻合度（kappa> 0.89）对其进行了正确分级。结论：肾脏多相3D MR血管造影是一项准确的技术，无需推注定时。与标准单相3D MR血管造影相比，早期动脉期成像的性能可改善图像的描绘，尤其是远端肾血管树的描绘。

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