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《Radiologic Practice》 2002-01
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Localization of motor cortex by real-time imaging process functional MRI during finger movements

ZHU Wenzhen,QI Jianpin, WANG chengyuan.Department of Radiology,Tongji Hospital Affiliated to Tongji Medical College of Huazhong University of Science & Technology, Wuhan 430030  
Objective:To study the correspondence between structure and function of the "hand knob" on the precentral gyrus and functional changes of motor cortex during self paced finger movements by RTIP fMRI in normal and abnormal conditions.Methods:10 right handed healthy volunteers and 3 patients with frontoparietal space occupying lesions were studied. fMRI were performed with a single shot, gradient echo echo planar pulse sequence on 1.5T GE scanner and real time image processing technique on the workstation. The activation tasks consisted of self paced finger movements performed with the right and left hand. Image postprocessing was done on the workstation by "correlation coefficient" algorithm analysis method.Results:①There was a good correspondence between anatomical landmarks of "hand knob" and the somatotopical organization of primary motor areas in 10 volunteers.②During finger task, functional changes occurred in the contralateral primary motor somatosensory cortex(M1/S1), most often containing "hand knob" structure, the supplementary motor area(SMA), and ipsilateral primary motor cortex. ③The time course plot of the "hand knob" in primary motor cortex matched to "box car" reference wave form, the correlation coefficient between the experimental and the reference plots is 0.51~0.88.④In the cases of frontoparietal space occupying lesions,a displacement or edema of "hand knob" was demonstrated clearly by RTIP fMRI. Conclusion: RTIP fMRI,a promising new technique, can localize motor cortex accurately.It is superior to any other fMRI techniques,may be put widely into use of function research of the brain.
【CateGory Index】: R445.2
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