标准化与协变量的顺序及存在的问题

尊敬的严老师:

       您好,我在进行预处理时,产生了下面两个问题

       1、我使用的是EPI模板进行空间标准化的,协变量放在标准化之前和之后都会产生下面问题,这个问题对最终结果的影响大吗?

             警告: 矩阵接近奇异值,或者缩放错误。结果可能不准确。RCOND =  1.724427e-09。

Cite DPABISurf

Cite DPABISurf

 

If you used DPABISurf in your data processing, citing it in your paper would be greatly appreciated!

Error caused by running c_null_model_und_sign

Dear All,

I get an error when I click "generate" in the Network Construction panel.

(The version of MATLAB is 2020b)

I try it several times, but it always happens, even when I don't click Calculate Graph Matrics and Raw Matrix.

To avoid any conflict between toolboxes, All toolboxes, but GraphVar, are removed.

I attach a picture for showing the details of my setting.

Forums:

Covert surface images in fsaverage5 space into volume images in MNI152 space

  1. First covert the original image in fsaverage5 space into image in fsaverage space. If your image is in fsaverage space whatsoever, please skip this step

 

dpabisurf处理demo数据报错

老师好,我使用dpabisurf处理demo数据的时候报错。错误信息如下:
 

关于三组ANOVA的分析问题

我最近在使用DPABI处理一批fMRI数据,有几个问题想要请教一下。
 

After GRF correction, significant clusters are larger

老师好!

我在对一张R.nii图像进行GRF矫正之后,发现看到的cluster比没做矫正之前更大了,这是不是不合理啊?

我的操作是这样的:

1)在Dpabi View的overlay里选定一张R.nii 图像 (这个界面的Nmax 和Nmin分别代表什么呢?我在两台不同电脑上打开同一个图,它出现的数字是不一样的)

2)在Overlay configure 输入P(0.05),df=5(sample size =7。 这里有点奇怪,df改为5后,accept了,但是重新点开‘df’,又是原来默认的数字,得改两遍才会变成我想要的那个数字。)

    完成这一步之后,看到的cluster都很小很小,应该是过不了GRF矫正了?

3)Cluster里那一栏选GRF,选定我自己的mask--- voxel p value (0.0214)----cluster p value(0.05)---- Two tailed----Compute

    这一步之后,激活的团块面积就变大了!

 

请求老师解答!非常谢谢!!

 

 

 

using DPABI on a preprocessed

Dear community

I hope this email finds you well

 

I would kindly ask if it is possible to use DPABI on a data which has been preprocessed using FSL?

 

The data we will use is a resting fMRI data and we would like to do ALFF/fALFF and ReHo analyses on this data..

 

 I would be very end thankful if you can help. 

 

Best Regards

 

 

Farzin

The DPABINet Brain Network Open Course is freely available online now!

The human brain is one of the most complex network systems in the universe, consisting of about 1011 neurons and about 1015 connections.

关于Automask和group mask 图像异常

老师您好!

我在预处理过程中选择了Auto mask,但是查看生成的mask时发现是个不规则的多边形;后面根据Auto mask生成的group mask同样是个不规则的图形;我想请问一下发生这种情况的原因是什么?

后续在统计分析分析中,我们采用了软件自带的mask,但是结果显示了较多边缘区域有显著差异,请问这种情况下我们应该如何解决呢?

期待您的回复!

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