Evaluation of the somatotopic organization of corticospinal tracts in the internal capsule and cerebral peduncle: results of diffusion-tensor MR tractography.
Evaluation of the somatotopic organization of corticospinal tracts in the internal capsule and cerebral peduncle: results of diffusion-tensor MR tractography.
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DOI：
10.3348/kjr.2008.9.3.191
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发表时间：
2008-05
影响因子：
4.8
通讯作者：
Khang H
中科院分区：
文献类型：
--
作者：
Park JK;Kim BS;Choi G;Kim SH;Choi JC;Khang H
我们已经使用扩散张量纤维束成像（DTT）的内囊（PLIC）和大脑脚（CP）的后肢皮质脊髓束（CST）的躯体定位组织的评价。我们对9名健康的右撇子受试者的大脑进行成像。我们使用了自旋回波回波平面成像（EPI）序列与12个扩散敏感方向。DTT的角度阈值为35度，各向异性分数（FA）阈值为0.25。我们通过在大脑左半球的脑桥预期区域和PLIC外侧半部分预期区域使用两个感兴趣区域（ROI）来确定CST的位置。将穿过这两个ROI和中央前回（PCG）的纤维束定义为CST。然后为PCG定义了四个新的ROI，从内侧到外侧，作为ROI 1（内侧）到ROI 4（外侧）。最后，我们使用两种ROI方法定义了桥脑和PCG中每个ROI之间的CST的每个纤维束。在所有受试者中，CST沿着PLIC的长轴排列，手纤维位于脚纤维的前方。CST在CP内呈横向，手纤维通常位于足纤维内侧。皮质脊髓束沿着PLIC的长轴和CP的水平方向排列。
We have used diffusion tensor tractography (DTT) for the evaluation of the somatotopic organization of corticospinal tracts (CSTs) in the posterior limb of the internal capsule (PLIC) and cerebral peduncle (CP). We imaged the brains of nine healthy right-handed subjects. We used a spin-echo echo-planar imaging (EPI) sequence with 12 diffusion-sensitized directions. DTT was calculated with an angular threshold of 35 degrees and a fractional anistropy (FA) threshold of 0.25. We determined the location of the CSTs by using two regions of interest (ROI) at expected areas of the pons and expected areas of the lateral half of the PLIC, in the left hemisphere of the brain. Fiber tracts crossing these two ROIs and the precentral gyrus (PCG) were defined as CSTs. Four new ROIs were then defined for the PCG, from the medial to lateral direction, as ROI 1 (medial) to ROI 4 (lateral). Finally, we defined each fiber tract of the CSTs between the pons and each ROI in the PCG by using two ROIs methods. In all subjects, the CSTs were organized along the long axis of the PLIC, and the hand fibers were located anterior to the foot fibers. The CSTs showed transverse orientation in the CP, and the hand fibers were located usually medial to the foot fibers. Corticospinal tracts are organized along the long axis of the PLIC and the horizontal direction of the CP.
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影响因子：
19.7
作者：
Yamada, Kei;Nagakane, Yoshinari;Nishimura, Tsunehiko
通讯作者：
Nishimura, Tsunehiko
影响因子：
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作者：
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Kim, JS;Pope, A
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通讯作者：
BENSON, WE
影响因子：
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作者：
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通讯作者：
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