May 2013

头动被试的处理方法

Submitted by Louise on Mon, 05/20/2013 - 10:34

各位老师好！最近在处理一批病人的数据，头动较大（放宽至3mm和3°）的被试比较多，但是被试的总体数量又比较少。想请问一下各位老师有没有对头动的被试的处理的方法。
暂时有两个想法：1.去掉头动较大的时间点。2.不去头动的被试，最后将头动作为协变量去掉。暂时只是这样想，还没有找到文献的依据，不知道具体可不可行，还请老师指点，多谢！

Forums: 
Resting-state fMRI topics

Global mean regression removes all voxels?

Submitted by nertman on Sat, 05/18/2013 - 01:25

Hi, I have been using DPARSFA for preprocessing and it has been working very well so far. I tried to remove the Global Signal nuisance regressor, but after doing so my data has no voxels left -- i.e., when I enter it into a first-level model in SPM, and estimate the model, I get this popup message:
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No inmask voxels - empty analysis!
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Forums: 
Resting-state fMRI topics

ICA

Submitted by rest_yan547833397 on Sun, 05/12/2013 - 13:18

各位老师：
     您们好，我最近在做ICA分析,遇到2个问题需向老师们请教。
      1）gift软件下的ICASSO工具箱有两个选项maximun/minimum cluster size to get stabe run， 请问是什么意思？如何填写比较合适。icasso所用原理和mica得到稳定成分的原理一样吗？
      2）如何计算高频信号》0.1hz占该独立成分的功率谱的百分比？
     期待各位老师回答
     祝好！

Forums: 
Resting-state fMRI topics

ICA

Submitted by rest_yan547833397 on Sun, 05/12/2013 - 13:18

老师：
     您好，我最近在做ICA分析,遇到2个问题需向老师请教。
      1）gift软件下的ICASSO工具箱有两个选项maximun/minimum cluster size to get stabe run， 请问是什么意思？如何填写比较合适。icasso所用原理和mica得到问题成分的原理一样吗？
      2）如何计算高频信号》0.1hz占该独立成分的功率谱的百分比？

Forums: 
Resting-state fMRI topics

ICA做脑区分割到最后怎样解决overlap的问题

Submitted by Remote Hill on Thu, 05/09/2013 - 16:43

张寒老师，
      您好，我现在用GIFT软件做ICA功能分区，把我的目标mask load进去后按照MDL算出了最适component进行了ICA运算，出来的ICs有很多都是重叠的，就是说我mask内的voxel对多个IC都有贡献，那么该能用什么软件将这些overlap的voxel进行分类使它们归于一个最相关的IC。还有关于您做的那个听觉分区的图，请教一下用什么软件可以进行颜色标记。rest里的Image calculate做的是nii格式的图，但是ica出来的是img和hdr的图，该怎样的转换进行ICs的求并集，这种求并集能否解决我说的overlap的问题，期待您的答复

       祝好.

Forums: 
Resting-state fMRI topics

GCA error

Submitted by yth0306 on Wed, 05/08/2013 - 21:07

老师，您好在GCA运算时通过AAL定义ROI，报错，麻烦指教，谢谢。
 Error using ==> rest_misc>ViewROI at 310 Wrong ROI definition, Please check: C:\Users\yth0306\Desktop\r.nii.img Error in ==> rest_misc at 196 ViewROI(AROIDef); Error in ==> rest_SetROI at 166 rest_misc( 'ViewROI', REST_SetROI_Cfg.ROIDefinition); ??? Error using ==> waitfor Error while evaluating uicontrol Callback GCA :"C:\Users\yth0306\Desktop\w\PA04" Computing GCA with: "C:\Users\yth0306\Desktop\w\PA04" Read 3D EPI functional images: "C:\Users\yth0306\Desktop\w\PA04"........................................ ROI time course retrieving through "C:\Users\yth0306\Desktop\r.nii.img". Exception occured. () Error using ==> rest_gca_coefficient at 141 Wrong ROI definition, Please check: C:\Users\yth0306\Desktop\r.nii.img 141#line, rest_gca_coefficient, in "F:\FDataanalysis\DATAanalysis\REST_V1.8_130303\REST_V1.8_130303\rest_gca_coefficient.m" 957#line, btnComputeGCA_Callback, in "F:\FDataanalysis\DATAanalysis\REST_V1.8_130303\REST_V1.8_130303\rest_gca_gui.m" 96#line, gui_mainfcn, in "F:\D\anhuangchengxu\matlab\toolbox\matlab\guide\gui_mainfcn.m" 39#line, rest_gca_gui, in "F:\FDataanalysis\DATAanalysis\REST_V1.8_130303\REST_V1.8_130303\rest_gca_gui.m" 0#line, @(hObject,eventdata)rest_gca_gui('btnComputeGCA_Callback',hObject,eventdata,guidata(hObject)), in ""

Forums: 
Resting-state fMRI topics

reho maps distorted after analyses

Submitted by rakesh on Tue, 05/07/2013 - 18:45

Dear REST experts,
i have processed the rest fMRI images with REST tool, REHO maps after the REST analyses is distorted , i am attaching the distorted image (left side image in the attachment) as well as the preprocessed image (right side image in the attachment) ,can any one pl. help
thanks in advance

Forums: 
Resting-state fMRI topics