关于时域动态分析

老师您好,我用dpabi里的TDA模块进行数据分析,划了16个时间窗,现在对结果文件有点困惑。Concordance_VolumeWise是每个被试全脑水平的指标一致性的值吗,因为每个被试的结果文件是16*1的数据?

Concordance_VoxelWise,每个被试生成一个nii文件。我不太明白为什么每个被试的一个体素只有一个值,而不是一个窗口一个对应的值,这样的话是取得所有时间窗的平均值吗?那划分时间窗的意义在哪里呢?

感谢老师作答!

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Extraction of ROI coordinates and ROI signal

Hi,


I working on fMRI data analysis. I am using ADNI data for classification activity. Inorder to classify AD, MCI and CN brains i want information about ROI coordinates and ROI signals for each data. Further i want to apply my algorithm for functional connectivity analysis. Kindly tell me how to get ROI coordinates and ROI signals.


 

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segment error

Dear inventors:

249 subjects, processing to the segment error.

Can this problem be solved only by increasing the physical memory of the PC?

the following pic are set of DPARSF and matlab, and the erro log.

Thanks a lot!

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The functional connectivity (FC) strength between two ROIs is negative, but the correlation between the strength of FC and behav

The functional connectivity (FC) strength between two ROIs is negative, but the correlation between the strength of FC and behavioral task score (accuracy) is positive. How to explain that? Is there any evidence to support that?

Thank you!

功能连接强度为负值,却和行为任务成绩呈正相关

老师好!

         两个种子点之间的静息态功能连接强度为负值(组,均值),但是和行为任务成绩的相关是正相关(显著),那么这种情况应该从何种角度解释呢?是否有相关的证据来支持?

非常感谢!

 

DPABI预处理协变量回归warning

各位老师好,我在用dpabi做rs-fmri的预处理时,协变量回归出现许多这样的warning:

Warning: Matrix is close to singular or badly scaled. Results may be inaccurate. RCOND = 1.561957e-09.

请问这样的问题是怎样造成的?对结果的影响是怎样的?应该如何处理呢?

我把报错的图片和我的预处理流程放在了附件里。我的协变量txt文件也一并在附件中。

还望各位老师解答,谢谢!

 

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iam beginner in resting state fMRI

dear DPABI team,  i need your help to know how to define  ROI for prefrontal brain cortex?

2nd question how to get values of ALFF for each individual  , i attached ALFFmap of one individual?

with my regrads,

gehan

No co* T1 image

Hi 

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Header information

Dear Experts

Here I have a couple of questions regarding the DPARSF pipepline.

How to find both slice number and time points from NIfTI or DICOM data files if they were not available at first place.

Thanks for considering my request.

Best wishes
Larry

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