缺血性腦卒中患者功能磁共振研究
[Abstract]:The first part is about the post-processing of magnetic resonance imaging in ischemic stroke.
Objective: To investigate the effect of intracerebral lesions on spatial standardization of NMR data processing in patients with acute ischemic stroke, to compare the focus template (Lesion_Mask) on high resolution T2WI/DWI, and to use different spatial standardization algorithms for spatial standardization, and for subsequent functional data. Analyze the theoretical basis for the analysis.
Methods: the functional data of 5 patients with unilateral acute ischemic stroke within one week of the onset of disease (Lesion_Mask (+)) / non removal of focus (Lesion_Mask (-)) and different spatial standardization algorithms (segmentation method, i.e. unified models/ non segmentation or non segmentation, were directly carried out in space standard). The focus of high resolution space T2WI/DWI is used as a variable. By calculating the focus volume (MNI_Lesion_Auto), overlap rate and volume error rate of the focus template converted to MNI space, the effects of the above three factors on space standards are discussed.
Result:
(1) compare several methods (T2WI/DWI high resolution image set Lesion_Mask, segmentation / non segmentation standardization algorithm) the MNI space automatically acquired focus image (MNI_Lesion_Auto), volume, volume error rate and lesion overlap rate of hand drawing focus images, all results are the removal of focus for ischemic stroke patients in this group There was no significant difference in spatial standardization of images (P0.05).
(2) the volume of focus (MNI_Lesion_Auto) of the focus image (MNI_Lesion_Auto) which the focus template is converted to MNI space is greater than that of the segmentation algorithm, and the focus overlap rate of the focus image (MNI_Lesion_Auto) obtained by the two standardized algorithms is only 0.25 + 0.10, and the Landmark tagging shows the disease. The location of foci, gray matter and white matter is different, indicating that the two standardization algorithms differ significantly.
(3) the overlap ratio calculated by the segmentation method / non segmentation method all showed that DWI_Lesion_Mask was superior to T2WI_Lesion_Mask and had obvious statistical difference (P0.05). Therefore, the manual setting of the focus mask on the DWI high resolution space was obviously superior to T2WI.
Conclusions: (1) there is no effect on the spatial standardization process of acute cerebral apoplexy patients. (2) in acute stroke patients, the establishment of focus templates in the high resolution DWI painting focus is superior to T2WI. (3) using different spatial standardization algorithms (segmentation / undivided square method) for the location and volume of the focus in MNI space, and The spatial position of cortex and white matter is also different. We recommend the use of segmentation method for spatial standardization.
The second part is the change of motor functional connectivity in patients with ischemic stroke before and after rTMS treatment.
Objective: To observe the characteristics of the changes in the functional network of the primary motor cortex (M1) in the ischemic stroke patients before and after the repeated transcranial magnetic stimulation (rTMS), and then reveal the evidence of the functional reorganization of the brain by using the resting state functional magnetic resonance imaging (fMRI).
Methods: 5 patients with unilateral ischemic stroke within one week were performed a resting state functional magnetic resonance (rs-fMRI) examination and clinical function score before and after repeated transcranial magnetic stimulation (rTMS). At the same time, 10 cases of normal volunteers were selected as the normal control group and only a rs-fMRI examination was performed. By analyzing the same of the rs-fMRI patients, The changes in the functional connection between the lateral primary motor cortex (M1) and the whole brain voxel were compared, and the difference of the functional connection between the patients before and after treatment and the normal control group was compared.
Results: (1) the value of functional connection of M1 area in both sides of the patients was lower (Z =0.30 + 0.24), lower than that of the normal control group (Z =0.70 0.21), and the connection value increased after treatment (Z value =0.58 + 0.28). The difference between the pre treatment group and the normal group and the difference of the group before and after treatment was statistically significant (P0.05), but the after treatment group and the normal control group were both M1 (P0.05). There was no statistical significance between the functional connectivity values (P0.05).
(2) compared with the control group, the ipsilateral M1 area and the ipsilateral temporal gyrus and bilateral cerebellar functional connection were enhanced, while the functional connection between the lateral M1 area and the contralateral auxiliary motor area was weakened. However, the posterior temporal gyrus, the contralateral temporal gyrus, the contralateral frontal gyrus, and the function connection to the lateral wedge increased in the ipsilateral M1 region and the bilateral cerebellum, the contralateral cerebellum, the lateral temporal gyrus, the lateral temporal gyrus, the contralateral lateral gyrus, the contralateral lateral frontal gyrus. Strong, with the ipsilateral premotor area, the ipsilateral M1 area, the contralateral paralateral lobule and the contralateral M1 area function connection weakened. All the areas with the enhanced and weakened function of all the functional connections were projected on the 3 dimensional ICBM template. Compared with the pre treatment group, the functional connection between the ipsilateral M1 region and the contralateral frontal lateral gyrus was enhanced in the post treatment group.
(3) compared with the pre treatment group, the NIHSS score of the affected limb was significantly lower (P0.05), the FMA score of the affected upper limb was significantly increased (P0.05), the FMA score of the lower extremities increased significantly (P0.05), and the BI score increased significantly (P0.05), suggesting that the patients were improved after treatment.
Conclusion: the changes of the functional connection of the M1 region in the affected side before and after the high frequency rTMS therapy are observed by resting state functional magnetic resonance (fMRI), which provides the basis for the revelation of the improvement of the function of the brain by rTMS.
【學位授予單位】:北京協和醫(yī)學院
【學位級別】:碩士
【學位授予年份】:2014
【分類號】:R743.3;R445.2
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