November 2010

关于分割配准的问题

Submitted by vivi on Sat, 11/13/2010 - 06:43

我使用dparsf进行ALFF的处理，跑完程序之后发现11个被试中有两个的分割结果不好，灰白质和脑脊液没有分离开，是模糊的，再看他们的功能像配准也有问题。由于之前做过VBM分析，当时是直接用spm分割的，相同的被试分割效果很好(详见下图)。回想起来，中间不同的是进行resting分析的时候多了结构像和功能像coregister这一步，想请教一下为什么这一步会带来这么大的变化呢，对于这两个被试resting图像的配准有什么其他的处理办法吗（如果还是想用分割配准）。

Forums: 
Resting-state fMRI topics

关于slice viewer使用的问题

Submitted by sxmu_psychiatry on Wed, 11/03/2010 - 23:21

老师您好，我在使用slice viewer时遇到这样的情况：
按照教程的提示，我用slice viewer打开一幅ALFF双样本t检验的图，并进行了多重比较校正的相关设置。但是在看结果报表，也就是点击CL REPORT这个按钮后，不能如教程所述那样显示出相应的结果，在MATLAB中提示：
Number of clusters found: 9
??? Cell contents reference from a non-cell array object.

Error in ==> rest_sliceviewer>cuixuFindStructure at 4300
        graylevel = DB{jj}.mnilist(index(ii, 1), index(ii, 2),index(ii, 3));

Error in ==> rest_sliceviewer>rest_report at 4146
    [a, b] = cuixuFindStructure(tmpmni, x.DB);

Forums: 
Resting-state fMRI topics

Within-Subject Comparison (Paired T-Test)

Submitted by skuehn on Mon, 11/01/2010 - 01:53

Hi,

I am planning a study in which I want to measure two periods of resting state for each participants and want to compare them by means of paired-t-tests.
There are two ways of doing this: (1) stopping the scanner after the first resting period and restarting it for the second or (2) not stopping and restarting the scanner.
In task related fMRI one would not want to compare conditions that come from different scanning runs. Does the same apply for resting state? If so I assume that option (2) is better.
What would be your suggestion?

Forums: 
Resting-state fMRI topics