about mask

Submitted by fMRInovice on

Dear experts,

I have a question about making mask. I want to make a mask according to the result of one sample t-test, including significant regions from one sample t-test both in patient and control groups. In the image calculator the expression is (i1>0)+(i2>0)>0. But this only results in a image that includes regions significantly higher than the mean value. What if I also want to include regions lower than the mean value? In the course video I caught that the expression could be (i1~0)+(i2~0)>0, but I got an error with this expression. What is the right expression format?

Thank you!

Best wishes.

Charlotte

YAN Chao-Gan

Sun, 02/22/2015 - 18:59

Permalink

Hi Charlotte,
It should be (i1~=0)+(i2~=0)>0 then.

Best,

Chao-Gan

On Sun, Feb 22, 2015 at 11:05 AM, The R-fMRI Network <rfmri.org@gmail.com> wrote:
[To post a comment, please reply to rfmri.org@gmail.com ABOVE this line]

By Jiechuan Ren (fMRInovice)

Dear experts,

I have a question about making mask. I want to make a mask according to the result of one sample t-test, including significant regions from one sample t-test both in patient and control groups. In the image calculator the expression is (i1>0)+(i2>0)>0. But this only results in a image that includes regions significantly higher than the mean value. What if I also want to include regions lower than the mean value? In the course video I caught that the expression could be (i1~0)+(i2~0)>0, but I got an error with this expression. What is the right expression format?

Thank you!

Best wishes.

Charlotte


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