Help from R-fMRI Network

Submitted by lixiangcx on
Hi, My name is Chang Xiao. I have been registered in R-fMRI Network. But now I have trouble logging in using my username "lixiangcx". Is there something wrong with my account? PS: I have a simple question regarding to xjview and slice viewer: In the xjview and the slice viewer, even if I set the same p value (and the same cluster size), the thresholds are different. Why? For example: In xjview, if I set p = 0.01, cluster size = 10, than the intensity is 2.3266. While in slice viewer, if I set p = 0.01, cluster size = 10, than the intensity is 4.9267.

Default mask vs. input mask

Submitted by hoptman on
Forums
DPABI/DPABISurf/DPARSF

Hi all,

I'm not sure what the default mask is.  Is this an "or" mask of the subejcts in the dataset, or not a mask at all?  Also what space is it in?  I'd like to limit the number of voxels in the analysis to just those where I have brain data for all subjects.  Do you have any recommendations?

Thanks,

Matt

文章大修，审稿人关于DPARSF预处理的问题，望请各位同道指教

Submitted by liuchen on
Forums
我想用中文提问 (I want to post in Chinese)

最近自己的一篇文章被PLOS ONE大修，方法学比较简单：一组病人与正常人之间ALFF自发脑活动的比较，数据的处理全部都是使用DPARSF进行的标准处理流程。

但是审稿人提了很多数据处理技术上的问题，鉴于自己的医学背景，望请各位高人指教，谢谢。

第一个问题：Q.2 The investigators excluded data that exceeded a specific motion threshold. However, it would be important to know if there were remaining differences in motion between groups? Was motion used as a covariate in the analyses performed?

在预处理阶段我已经把头动作为变量校正了，还需要在后续的两组比较把头动作为协变量吗？

如果两组头动参数在进行两组比较之后并没有显著性差异，还需要作为协变量吗？

 

AlphaSim

Submitted by banyu on
Forums
DPABI/DPABISurf/DPARSF

Dear developers and users,

I'd like to use AlphaSim to correct VBM p values. The voxel size is 1.5*1.5*1.5, and smoothing used a Gaussiankernel of 8mm full width at half maximum. I wondered what the rmm and cluster size shoud be set.

Best regards,

Feng

Error applying Reorient Mats

Submitted by Anonymous (not verified) on
Forums
DPABI/DPABISurf/DPARSF

I tried the suggestion of keeping the reorientation .mat files and changing the name of their directory to DownloadedReorientMats in order to skip the reorientation.

But, this error came up:  (by the way, the error below comes after some warnings about SliceOrder and RefFile being cleared before the reiteration of each parfor loop -- I assume these warnings were unrelated and unimportant).

About smReHO

Submitted by Freshman2013 on
Forums
DPABI/DPABISurf/DPARSF

I try to ask question in English:

Now, I use DPARSF to do ReHO analysis from the step(FunImgNormalized) and based on the Data without smooth.

I calculate the value of ReHO, and smReHO with 27 voxels after detrending and filtering.

As Professor Yan mentioned in the REST video, smReHO is the mReHO with smoothness. But I am sure which is the FWHM ?4or other values?

Thanks in advance.

 

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