頁籤選單縮合
題 名 | Response of the Human Motor Cortex--An Application of the Functional MRI |
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作 者 | Chiu,Ming-jang; Chuang,Kai-hsiang; Chen,Jyh-horng; Huang,Kou-mou; | 書刊名 | 醫學工程 |
卷 期 | 10:6 1998.12[民87.12] |
頁 次 | 頁14-19 |
分類號 | 410.1644 |
關鍵詞 | Functinal MRI; Human motor cortex; Correlation coefficient analysis; |
語 文 | 英文(English) |
英文摘要 | Functional magnetic resonance imaging (fMRI) is a noninvasive imaging tool capable of Localizing and measuring the activation of brain tissue. We studied the effect of sequential finger tapping of the dominant hand on activation of the human motor cortex by using fMRI on 8 right-handed normal male volunteers. The signal intensity changes between periods of activation and resting were derived first by a threshold procedure i.e., correlation coefficient analysis. Further study included the computation of the averaged signal changes on those pixels located in the regious of interest (ROIs) with signal intensity above the statistic level (p<0.001). Finally, we mapped those activated pixels back on to a sturctural image for display. The mean averaged signal changes in ROIs were 6.2% ± 2.3%(4.4-11.6%). During the finger tapping motor task, all subjects (n=8) showed activation in the contralateral primary motor cortex. The other brain areas activated included the contralateral somatosensory (2/8), supplementary motor (2/8), and premotor area (3/8). Occasional equivocal activation can also be seen in the ipsilateral primary motor (2/8), supplementary motor (2/8), and premotor areas (2/8). However, none of the subjects showed activation in the ipsilateral somatosensory area. The result of this study indicates that fMRI is capable of detecting regional signal changes related to brain activity induced by motor task within the primary as well as the association motor cortex. The technique of functional imaging and quantitative analysis utilized in this study should be able to have clinical application in aspects such as prognostic assessment of ischemic stroke or pre-surgical evaluation of brain tumour in the future. |
本系統中英文摘要資訊取自各篇刊載內容。