摘要
目的：评估时间分辨回波分享磁共振血管成像（TREAT MRA）和并行采集技术在血管性病变中的显示效果和临床应用价值。方法：25个临床诊断或怀疑血管性病变患者行TREATMRA检查，采用3DFLASH序列，用加速因子为2的并行采集技术和回波分享技术填充K空间，采集1帧3D图像用时2～3s，共12帧动态显示靶血管解剖结构。分析全部病例的图像质量和病变显示情况，并与其它检查作对照。结果：所有病例均顺利完成TREAT MRA检查；TREAT MRA动态显示了动静脉充盈情况，至少有1～3帧动脉显示时无静脉污染；所有病例动脉结构显示清楚，包括动脉主干和肾、肺、手足动脉远端分支。TREAT MRA发现2例颈动脉和1例肾动脉狭窄，2例主动脉夹层和破口，前臂血管瘤，足部动静脉瘘和肺动静脉瘘各1例，病变显示清楚，10例行TREAT MRA的病例与其它检查技术结果比较，均与之完全符合。结论：TREAT MRA结合并行采集能以高时间分辨力清楚显示血管结构，效果类似于DSA。
Objective： To evaluate the diagnostic value of time-resolved echo-shared MRA with parallel acquisition techniques. Methods：Twenty-five patients with clinically diagnosed or suspected vascular diseases underwent time-resolved echo-shared MRA （TREAT MRA）. A 3D FLASH pulse sequence was used for imaging. This was combined with parallel imaging with an acceleration factor of 2 and echo sharing to reduce the acquisition time to 2～3 seconds per 3D frame. The acquisition was repeated 12 times to depict the arterio-venous anatomy dynamically. The overall image quality and the demonstration of vascular pathology were analyzed. TREAT MRA findings were also compared to other imaging modalities if available. Results：TREAT MRA was successfully performed in all patients. It demonstrated dynamically the arterio-venous structures. There were at least 1～3 3D frames which depict the arteries without contamination of veins. It clearly identified arteries including the distal segments of renal, pulmonary,hand and foot arteries. TREAT MRA detected 2 cases of carotid artery stenosis, 1 case of renal artery stenosis, 2 cases of aortic dissection, 1 case of forearm angioma, 1 case of foot arterio-venous fistula and another case of pulmonary arterio-venous fistula. The vascular pathology in these cases was demonstrated clearly. In 10 cases with other imaging techniques available, the demonstration of vascular pathology all agreed to that done by TREAT MRA. Conclusion：TREAT MRA can produce detailed images with high temporal resolution. It has an effect quite similar to DSA. It will play an important role in the diagnosis of vascular pathology.
出处
《放射学实践》
2006年第2期179-182,共4页
Radiologic Practice
关键词
磁共振成像
血管病变
图像处理
计算机辅助
Magnetic resonance imaging, Vascular pathology
Image processing,computer-assisted
