| ESWAN序列参数对出血性剪切灶及脑静脉显示的影响和分析 |
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| 引用本文： | 张菁,陈浪,王承缘,漆剑频,冯定义.ESWAN序列参数对出血性剪切灶及脑静脉显示的影响和分析[J].临床放射学杂志,2011,30(7). |
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| 作者姓名： | 张菁 陈浪 王承缘 漆剑频 冯定义 |
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| 作者单位： | 华中科技大学附属同济医院放射科,武汉,430030 |
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| 摘 要： | 目的研究多回波采集的增强T2*加权血管成像(ESWAN)序列的TR和TE参数对磁敏感效应的影响;调整更适合出血性剪切灶检出的ESWAN序列参数。资料与方法 10例弥漫性轴索损伤(DAI)患者经两种不同参数设置的ESWAN序列(两种序列的参数区别在于:短TE的ESWAN序列的首个回波TE 10 ms,TR 77 ms;长TE的ESWAN序列的首个回波TE 48 ms,TR 104 ms)扫描获得两组ESWAN图像,经后处理得到两组幅度图,将幅度图行最小强度投影(MinIP)后在两组图像上分别计数出血灶的数目、测量出血灶的容积,在三脑室上部及室间孔层面对显影的脑深部静脉计数。用配对t检验的方法检验两组数据的差异性。结果两组图像显示的微出血灶的数量及分布完全一致;长TE的ESWAN序列测量的微出血灶容积显著大于短TE的ESWAN序列;长TE的ESWAN序列显示的脑深部静脉数量明显多于短TE的ESWAN序列。结论 ESWAN序列的多回波采集优势,即使明显缩短首个回波的TE,后续的回波仍能保障对微出血灶检出的磁敏感效应;随着TE的延长,显影的静脉数量明显增多,但模糊效应也逐步放大,出血灶容积的放大比例也增加。对于脑外伤...
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| 关 键 词： | 磁敏感加权成像 多回波采集 微出血灶 磁共振静脉成像 |
Impact of the Parameters of Enhanced T_2 Star Weighted Angiography(ESWAN) on the Display of Hemorrhagic Shearing Lesions and Cerebral Veins as Well as Causal Analysis |
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| ZHANG Jing,CHEN Lang,WANG Chenyuan,et al..Impact of the Parameters of Enhanced T_2 Star Weighted Angiography(ESWAN) on the Display of Hemorrhagic Shearing Lesions and Cerebral Veins as Well as Causal Analysis[J].Journal of Clinical Radiology,2011,30(7). |
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| Authors: | ZHANG Jing CHEN Lang WANG Chenyuan |
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| Institution: | ZHANG Jing,CHEN Lang,WANG Chenyuan,et al. Department of Radiology,Tongji Hospital,Huazhong University of Science and Technology,Wuhan 430030,P.R.China |
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| Abstract: | Objective To find reasonable TE and TR parameters of enhanced T2 star weighted angiography(ESWAN) for the detection of micro hemorrhagic shearing lesions.Materials and Methods 10 DAI patients were included in the study.MRI was performed on a 1.5T MR scanner(Signa HD,GE Healthcare,USA) using the following parameters:(1) short TE ESWAN sequence:TE 10 ms,TR 77 ms;(2) long TE ESWAN sequence:TE 48 ms,TR 104 ms.Two new sets of images were reconstructed by using the mean square root of the last six echoes from sho... |
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| Keywords: | Susceptibility weighted imaging Multi-echo acquisition Micro-hemorrahgic lesion Magnetic resonance venography |
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