May 2009

ROI definition

Submitted by alex on Fri, 05/29/2009 - 13:59

 Hi,
I am trying to run a correlation for a group of subjects at once. I have the timecourses for my seed ROI in text files. It seems however, that the option for defining voxelwise ROIs using text files only allows one file to be loaded at a time. Is it possible to load multiple text files, corresponding to the seed timecourses for each subject?
Thanks for your help,
Alex

Forums: 
Resting-state fMRI topics

[REST]Fixed the bug of reading and writing error under the linux, unix or mac operation system.

Submitted by YAN Chao-Gan on Sun, 05/24/2009 - 14:47

Hi, all!
       Some users have found that they wound meet reading and writing errors under the linux , unix or mac operation system.
       Now I have fixed this problem and released it in advance. Please click here to download it (REST2007V1.3_090525.zip).

Forums: 
Resting-state fMRI topics

Anticorrelations

Submitted by alex on Sat, 05/23/2009 - 21:22

 Hi again,
I am interested in using REST to examine anticorrelations. I just wanted to check the following:
1 - If I include a global signal timeseries as a covariable, then the analysis will produce maps showing voxels significantly correlated with the seed timecourse after controlling for global signal fluctuations. That is, it is essentially like performing a global signal regression. Is this correct?
2 - Anticorrelations will be revealed by negative values in the resulting connectivity and z-maps. Is this correct?

thanks for your help,

Forums: 
Resting-state fMRI topics

Maximum variable size

Submitted by alex on Wed, 05/20/2009 - 20:02

 Hi,
I tried to start a seed-based connectivity analysis, but it stopped at the first, detrending stage with the error: "Maximum variable size allowed by the program is exceeded".

Is there a limit on the number of volumes or subjects that can be analysed? I have 840 volumes. I was trying a pilot analysis in 5 subjects.

Thanks for your help,
Alex

Forums: 
Resting-state fMRI topics

Pleae resmaple your mask or ROI definition file first!

Submitted by YAN Chao-Gan on Mon, 05/18/2009 - 13:39

Hi, Cleofé Peña Gómez!
     1. You need to resample your mask or ROI file to the dimension of your functional images.
          There were three ways: (1) use SONG Xiao-Wei's program, from http://restfmri.net/forum/node/78                              

                                                 (2) use my program, from http://restfmri.net/forum/node/81   (the third one)
                                                 (3) use SPM5:
                                                                       a. Click "Coregister"
                                                                       b. Click "New "Coreg: Reslice""
                                                                       c. "Image Defining Space": choose one of your functional image. e.g. your normalized functional image or image after Detrend and Filter.
                                                                       d. "Images to Reslice": choose the mask file or ROI definition file. e.g. BrainMask_05_61x73x61.img
                                                                       e. "Reslice Options" -> "Interpolation": choose "Nearest neighbour"
                                                                       f. Just click "Run". Then you will get the resmapled mask or ROI file with a surfix of "r".
      
Forums: 
Resting-state fMRI topics

REST functional connectivity error 'Matirix dimensions'

Submitted by YukiSakai on Sat, 05/16/2009 - 00:58

Hi, REST exparts

 I'm trying to analyze my resting state fMRI data using by REST functional connectivity. I've tried many times, but I always encount this error.

Exception occured
Error using ==>eq
Matrix dimensions must agree

I think that dimensions of my data don't match. Dimensions of my data are 79X95X69(Vox size 2X2X2, smooth 6mm). How can I solve this probrem? I'm sorry I'm just a biginner.

 Thanks in advance.
Sincerely,
 Yuki

Forums: 
Resting-state fMRI topics

Q&A: "REST error...ReadNiftiImage.m"

Submitted by YAN Chao-Gan on Wed, 05/06/2009 - 09:44

Hello,

I am trying to analyze some resting state data using REST, but I cannot load the data in the GUI.  Am I correct to assume we need to enter data in conseqcutive file names of ANALYZE format?  The error message I get in Matlab refers to line 103 of rest_ReadNiftiImage.m

Is this script necessary if we are using ANALYZE not NIFTI?  If it is not necessary how do I skip it.

I do not know how to proceed.  Any assistance would be greatly appreciated.

Thank you,

Carlos

Forums: 
Resting-state fMRI topics

静息态研究

Submitted by sunshine on Fri, 05/01/2009 - 14:27

各位老师：
      大家好！我记得曾经看过一篇文章上说静息态默认网络中的脑区在有刺激的作用下时信号会降低，但现在一直没找到当时看的那篇文章，想请问各位老师是不是真有这个结论，如果有含有这个结论的文章能否给我传一份？谢谢！我的邮箱是：qiuwenjuan1014@yahoo.cn

Forums: 
Resting-state fMRI topics