Renal arteries: optimization of three-dimensional gadolinium-enhanced MR angiography with bolus-timing-independent fast multiphase acquisition in a single breath hold.
Renal arteries: optimization of three-dimensional gadolinium-enhanced MR angiography with bolus-timing-independent fast multiphase acquisition in a single breath hold.
复制标题
肾动脉：在单次屏气中通过与推注时间无关的快速多相采集来优化三维钆增强磁共振血管造影。
作者：
S. O. Schoenberg;Michael Bock;M. V. Knopp;M. Essig;G A Laub;H. Hawighorst;Ivan Zuna;Friedrich Kallinowski;G. van Kaick
目的
目的：比较两种不同的三维(3D)增强磁共振(MR)血管成像技术。
材料和方法
对26例怀疑有肾动脉狭窄的患者，对37例患者的快速多期3D MR血管成像结果与标准3D MR血管成像结果进行了比较。使用这两种技术，进行了31秒的屏气采集。多时相血管造影术包括5次离散的6.4秒采集，没有推注计时，而标准血管造影术包括基于推注计时的一次采集。两位读者从图像质量、伪影和血管的显着性方面对这两种技术获得的图像进行了评估。通过与数字减影血管造影和手术结果的比较，确定多时相3D MR血管成像结果评估肾动脉狭窄的准确性。
结果
在动脉早期，多时相3D MR血管成像显示静脉覆盖没有图像退化，而标准3D MR血管成像显示83条肾动脉中至少有53条有微小覆盖(P<；.001)。动脉早期实质强化较少，分支动脉和节段性动脉的血管显影率较高(P<；.001)。两位读者在多期血管造影术中发现并正确地对20处狭窄中的18处进行了分级，观察者之间几乎完全一致(kappa>；0.89)。
结论
肾脏多时相3D MR血管成像是一种不需要给药时机的准确技术。与标准的单期3D MR血管成像相比，早期动脉相成像的表现导致了更好的描述，特别是对远端肾血管树的显示。
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.
影响因子：
19.7
作者：
Wilman, AH;Riederer, SJ;Ehman, RL
通讯作者：
Ehman, RL
影响因子：
19.7
作者：
PRINCE, MR;NARASIMHAM, DL;CHO, KJ
通讯作者：
CHO, KJ