Peripheral Vasculature: High-Temporal- and High-Spatial-Resolution Three-dimensional Contrast-enhanced MR Angiography
Peripheral Vasculature: High-Temporal- and High-Spatial-Resolution Three-dimensional Contrast-enhanced MR Angiography
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DOI：
10.1148/radiol.2533081744
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发表时间：
2009-12-01
期刊：
影响因子：
19.7
通讯作者：
Riederer, Stephen J.
中科院分区：
文献类型：
--
作者：
Haider, Clifton R.;Glockner, James F.;Riederer, Stephen J.
目的：前瞻性地评价进行高空间分辨率（1-mm各向同性）时间分辨三维（3D）对比材料增强的外周血管磁共振（MR）血管造影术，采用笛卡尔采集，具有投影重建样采样（CAPR）和八倍加速二维（2D）灵敏度编码（SENSE）。所有研究均经机构审查委员会批准，并符合HIPAA;从所有参与者处获得书面知情同意书。共有13名志愿者（平均年龄41.9岁;范围27-53岁）。调整CAPR序列以提供1 mm各向同性空间分辨率和5秒帧时间。对于放置在视场的前后侧与左右侧的那些，使用不同的接收器线圈元件尺寸减少了由于加速度引起的信噪比损失。8名志愿者的结果由两名放射科医生根据伪影的突出程度、动静脉分离、血管清晰度、主要动脉（胫前和胫后、腓动脉）中动脉信号强度的连续性、主要动脉起源的分界和整体诊断图像质量独立评定。MR血管造影结果在两例周围血管疾病进行了比较，他们的结果在CT angiography.Results：序列表现出没有图像伪影影响诊断图像质量。所有病例的时间分辨率均被评价为足够，即使已知动脉-静脉快速通过。血管被分级为具有极好的锐度、连续性和主要动脉起点的分界。远端肌支、交通动脉和穿通动脉均可见。16次评价中有15次（94%）诊断质量良好。结论：CAPR和8倍加速2D SENSE技术联合应用，可实现高诊断质量的外周血管时间分辨3D增强MR血管成像。(C)RSNA，2009年
Purpose: To prospectively evaluate the feasibility of performing high-spatial-resolution (1-mm isotropic) time-resolved three-dimensional (3D) contrast material-enhanced magnetic resonance (MR) angiography of the peripheral vasculature with Cartesian acquisition with projection-reconstruction-like sampling (CAPR) and eightfold accelerated two-dimensional (2D) sensitivity encoding (SENSE).Materials and Methods: All studies were approved by the institutional review board and were HIPAA compliant; written informed consent was obtained from all participants. There were 13 volunteers (mean age, 41.9; range, 27-53 years). The CAPR sequence was adapted to provide 1-mm isotropic spatial resolution and a 5-second frame time. Use of different receiver coil element sizes for those placed on the anterior-to-posterior versus left-to-right sides of the field of view reduced signal-to-noise ratio loss due to acceleration. Results from eight volunteers were rated independently by two radiologists according to prominence of artifact, arterial to venous separation, vessel sharpness, continuity of arterial signal intensity in major arteries (anterior and posterior tibial, peroneal), demarcation of origin of major arteries, and overall diagnostic image quality. MR angiographic results in two patients with peripheral vascular disease were compared with their results at computed tomographic angiography.Results: The sequence exhibited no image artifact adversely affecting diagnostic image quality. Temporal resolution was evaluated to be sufficient in all cases, even with known rapid arterial to venous transit. The vessels were graded to have excellent sharpness, continuity, and demarcation of the origins of the major arteries. Distal muscular branches and the communicating and perforating arteries were routinely seen. Excellent diagnostic quality rating was given for 15 (94%) of 16 evaluations.Conclusion: The feasibility of performing high-diagnostic-quality time-resolved 3D contrast-enhanced MR angiography of the peripheral vasculature by using CAPR and eightfold accelerated 2D SENSE has been demonstrated. (C) RSNA, 2009