| 窦郁,韩鸿宾,郭顺林,雷军强.不同参数扩散张量脑白质成像重建小脑上脚交叉示踪[J].中国医学影像技术,2010,26(4):752~755 |
| 不同参数扩散张量脑白质成像重建小脑上脚交叉示踪 |
| Appearances of decussation of superior cerebellar peduncle in DTT FACT with different reconstruct parameters |
| 投稿时间：2009-06-08 修订日期：2009-08-15 |
| DOI： |
| 中文关键词: 小脑上脚交叉 神经纤维 扩散磁共振成像 |
| 英文关键词:Decussation of superior cerebellar peduncle Nerve fibers Diffusion magnetic resonance imaging |
| 基金项目: |
|
| 摘要点击次数: 2249 |
| 全文下载次数: 949 |
| 中文摘要: |
| 目的 观察扩散张量脑白质成像连续示踪纤维分配技术(DTT FACT)不同成像和重建参数下小脑上脚(SCP)交叉纤维示踪表现。 方法 采用Siemens 3.0T MR及工作站对20名健康成人行头颅轴位扩散张量成像(b=0、1000 s/mm2), 应用DTT FACT重建SCP交叉纤维,分析不同重建参数下的交叉纤维的表现。选择参数如下:①体素大小为1.2 mm×1.2 mm×3.0 mm、1.2 mm×1.2 mm×5.0 mm、1.6 mm×1.6 mm×3.0 mm、1.6 mm×1.6 mm×5.0 mm。②各项异性(FA)阈值为0.04、0.08、0.12、0.16、0.20。③角度阈值为20°、40°、60°、80°、89°。结果 ①不同体素时DTT图均出现纤维交叉,小体素中纤维交叉类型明显多于大体素。②FA降低,交叉纤维的例数逐渐增多;FA＝0.08时为峰值;之后,FA降低,交叉纤维的例数逐渐减少。③角度增大,交叉纤维的例数逐渐增多,角度＝80°为峰值;之后,角度增大,交叉纤维的例数逐渐减少。④小脑上脚交叉纤维在DTT图上有五种不同表现形式:向前形成盲端、上下交叉上行、前后交叉上行、吻接上行、单侧向前。结论 DTT FACT重建小脑上脚交叉纤维的最佳参数是体素1.2 mm×1.2 mm×3.0 mm,FA 0.08,角度阈值80°。小脑上脚纤维交叉有不同表现类型,可能与个体差异有关。 |
| 英文摘要: |
| Objective To observe the appearances of decussation of superior cerebellar peduncle (SCP) on MR diffusion tensor imaging (DTI) with different parameters of scanning and reconstruction. Methods Twenty healthy volunteers were examined on Siemens 3.0T MR DTI (b=0, 1000 s/mm2), post processing were made in Siemens Leonardo workstation using Siemens Standar 6 dirs software to reconstruct the white matter fibers with different fractional anisotropy (FA) threshold value (0.04—0.20), angle threshold value (20°—89°) and voxel size (1.2 mm×1.2 mm×3.0 mm—1.6 mm×1.6 mm×5.0 mm). Results Crossing fiber was presented each voxel group on diffusion tensor tractography (DTT). The types of crossing fiber in the small voxel were more than those of big voxel image obviously. Reduced along with the FA threshold value, the number of crossing fiber increased gradually. After the peak value (FA=0.08), the number of crossing fiber reduced along with the FA threshold value reduced gradually. Increased along with the angle threshold value, the number of crossing fiber increased gradually. The number of crossing fiber reduced along with the angle threshold value increased gradually after the peak value (the angle threshold value＝80°). There were 5 kinds of MR fiber tracking appearances at the level of decussation of SCP on DTT. The fiber crossed to the opposited red nucleus in anterior-posterior style, superior-inferior style and single main bundle fiber. Kissing fiber and missing fiber sign was shouw in all subjects, which mainly located in the center of the decussation. Conclusion DTT FACT can show the descussation of SCP in most health subjects with five typical appearance. The descussation of SCP has the obvious appearances, may be causing by individual difference. For the crossing fiber of SCP, voxel size 1.2 mm×1.2 mm×3.0 mm, FA 0.08 and the angle 80° are recommended. |
| 查看全文 查看/发表评论 下载PDF阅读器 |
|
|
|
