| 韩林梅,俞琴.并行采集技术在1.5T 8通道相控阵线圈头颅3D TOF MRA中的优化:体模研究[J].中国医学影像技术,2019,35(3):423~427 |
| 并行采集技术在1.5T 8通道相控阵线圈头颅3D TOF MRA中的优化:体模研究 |
| Optimization of parallel acquisition technique in 3D TOF MRA of head with 8-receiving channels phased-array coil in 1.5T MR system: A phantom study |
| 投稿时间：2018-07-20 修订日期：2018-11-27 |
| DOI：10.13929/j.1003-3289.201807146 |
| 中文关键词: 并行采集技术 视野 优化 血管造影术 磁共振成像 |
| 英文关键词:parallel acquisition technique field of view optimization angiography magnetic resonance imaging |
| 基金项目: |
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| 中文摘要: |
| 目的 探讨并行采集技术（ASSET）在8通道相控阵线圈头颅水模3D TOF MRA中的应用及伪影消除方法，优化3D TOF MRA扫描方案。方法 使用MRI专用标准头颅水模，通过对ASSET加速因子（R值）、相位FOV（FOVp）、扫描FOV（FOVs）以及校准FOV（FOVc，分别为30 cm×30 cm、35 cm×35 cm和40 cm×40 cm，对应A、B、C组）的调整与组合对水模进行3D TOF MRA扫描，测量两侧卷褶伪影间的最短距离（D）及图像SNR，记录各组图像的扫描时间和相位方向分辨率（Rp），寻找最优参数组合。结果 随FOVc增大，ASSET伪影逐渐加重；随着FOVs和FOVp增大以及R值减小，卷褶伪影间距D值逐渐增大直至消失。R值及FOVp不变时，扫描时间不变；当R值固定时，SNR随FOVs及FOVp增大而增高；当FOVs及FOVp固定时，SNR随R值增大而降低；Rp随FOVs及FOVp增加而降低。结论 使用ASSET技术需要选择适当的R值与相应的FOVc、FOVs及FOVp；上述条件下，FOVc为35 cm×35 cm，FOVs为28 cm×28 cm，FOVp为0.75，R为1.25时为水模3D TOF MRA扫描的最优参数配置。 |
| 英文摘要: |
| Objective To explore the application value of array spatial sensitivity encoding technique (ASSET) in 3D TOF MRA of head with 8-receiving channels phased-array coil in 1.5T MR system and the methods to eliminate image artifact, in order to optimize the scanning protocol of 3D TOF MRA. Methods Using the standard model of head for MRI, scanning of 3D TOF MRA was performed combining with different ASSET reduce factor (R value), phase FOV (FOVp), scanning FOV (FOVs) and calibration FOV (FOVc; 30 cm×30 cm in group A, 35 cm×35 cm in group B and 40 cm×40 cm in group C). Then the shortest distance between bilateral wrapped artifacts (D) and SNR was measured, and the acquisition time (TA) of each group and resolution on phase direction (Rp) were recorded. Then the optimized parameters were estimated. Results ASSET artifact became serious as FOVc increased, the distance between wrapped artifact broadened to disappear as FOVs and FOVp increased and R value decreased. TA unchanged as R value and FOVp unchanged. When R value fixed, SNR increased as FOVs and FOVp increased. SNR decreased as R value increased when FOVs and FOVp fixed. Rp decreased as FOVs and FOVp increased. Conclusion ASSET scanning needs right R value matching with corresponding FOVc, FOVs and FOVp. The optimization parameters under the above mentioned condition for 3D TOF MRA of head are FOVc with 35 cm×35 cm, FOVs with 28 cm×28 cm, FOVp with 0.75 and R value with 1.25. |
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