| 李涛,高建华,赵绍宏,周卫华,蔡祖龙,杨立,程流泉,高元桂.猪体外冠状动脉管壁高分辨MR成像[J].中国医学影像技术,2010,26(4):589~592 |
| 猪体外冠状动脉管壁高分辨MR成像 |
| High resolution MR imaging of porcine coronary arterial wall in vitro |
| 投稿时间：2009-06-23 修订日期：2009-12-17 |
| DOI： |
| 中文关键词: 冠状血管 磁共振成像 |
| 英文关键词:Coronary vessels Magnetic resonance imaging |
| 基金项目: |
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| 中文摘要: |
| 目的 利用1.5T MR扫描仪寻求简单易行的体外冠状动脉管壁成像程序。方法 对10个猪心行冠状动脉MR检查。以3D FIESTA序列行前降支成像,分别选择8通道头部线圈、膝关节线圈、颞下颌关节表面线圈行2D SE T1WI, 成像参数均相同,之后用颞下颌关节表面线圈,采用384×256和512×512的矩阵行T1WI。注入对比剂后,分别使用不同的NEX行SE T1WI、PDWI和frFSE T2WI。测量前降支近段管壁、管腔、前降支周围心外膜下的脂肪结缔组织、前降支邻近的室间隔心肌的信号强度,并测量周围空气的信号强度作为背景噪声,计算图像的信噪比(SNR)和冠状动脉管壁对管腔的对比噪声比(CNR1)及冠状动脉管壁对周围心外膜下脂肪结缔组织的对比噪声比(CNR2)。结果 颞下颌关节表面线圈成像前降支管壁SE T1WI的SNR和CNR1、CNR2明显高于8通道头线圈和膝关节线圈。384×256矩阵所得的SE T1WI的SNR和CNR1、CNR2明显高于512×512矩阵。NEX为3时图像的SNR和CNR1、CNR2最高。结论 选择颞下颌关节表面线圈、384×256的矩阵、3个NEX可以得到良好的SNR和CNR。 |
| 英文摘要: |
| Objective To get a MR imaging protocol for coronary arterial wall in vitro. Methods MR examinations were performed in 10 fresh porcine hearts. Three dimensional fast imaging employing steady state acquisition (3D FIESTA) was used to delineate left anterior descending artery (LAD), while 2D spin-echo T1W was performed with 8-channel head surface coil, temporomandibular surface coil and knee coil with the same parameters. T1WI was obtained with 384×256 and 512×512 in matrix using temporomandibular surface coil, and then T1WI, PDW and T2WI with fat saturation were obtained with different NEX using temporomandibular surface coil after injecting Resovist in LAD. Signal of the LAD wall, lumen, fat tissue adjacent to LAD, myocardium of anterior part of interventricular septum and noise were respectively measured. Signal-to-noise ratio (SNR) of image, contrast to noise ratio (CNR) between the wall and lumen (CNR1), CNR between the wall and surrounding fatty tissue (CNR2) were calculated. Results The SNR and CNR1, CNR2 of SE T1WI with temporomandibular coil were higher than those with 8-channel head surface coil and knee coil. SNR and CNR1, CNR2 of SE T1WI with 384×256 matrix were higher than those with 512×512 matrix. SNR and CNR1, CNR2 using 3 NEX were the highest. Conclusion Good SNR and CNR of porcine coronary wall can be achieved using temporomandibular surface coil, 384×256 in matrix and NEX of 3. |
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