Hi there,

I have a question about the exclusive masking analysis in FSL using the command "fslmaths".

We can look at between two results, with the command "fslmaths", if a region is specifically correlated to one of these results (e.g., to show Y without X). My problem is that, however, I have three results. I wonder if we could use "fslmaths" to exclude two results from the remaining one. For example, I have three results: A, B and C. Could I use this command to show A without B, and without C at the same time?

Actually I tried something. But I am not sure if they are correct.

Firstly, I binarized all three maps at the beginning. Could I do something like:

1. Exclude B from A:

fslmaths B.nii.gz -mul -1 -add 1 -mul A.nii.gz exclusive_B_from_A.nii.gz

2. Exclude C from exclusive_B_from_A.nii.gz

fslmaths C.nii.gz -mul -1 -add 1 -mul exclusive_B_from_A.nii.gz Only_A.nii.gz

OR:

1. Exclude B from A:

fslmaths B.nii.gz -mul -1 -add 1 -mul A.nii.gz exclusive_B_from_A.nii.gz

2. Exclude C from A:

fslmaths C.nii.gz -mul -1 -add 1 -mul A.nii.gz exclusice_C_from_A.nii.gz

3. Overlap these two results:

fslmaths exclusive_B_from_A.nii.gz -mul exclusive_C_from_A.nii.gz Only_A.nii.gz

I got same results from these two ways. But I am thinking that I might miss something as I implemented the exclusive masking twice.

Hope it makes sense. I would greatly appreciate if you could have a look and advise me how to proceed.

Kind regards,

Sherry

Sherry Chen
PhD Candidate

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