Dear AFNI experts,

I am looking for some advice to extracting beta values from specific brain area.
There are two questions, one is generating a mask, and the other one is extracting the beta values
(I'm new to this part, so forgive me if my question is too basic..)

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Steps which I did:
1. Extract cluster, where I am interest in, from ANOVA result:
3dclust -1noneg -1thresh 0.05 -prefix anova_cluster 3 500 ANOVA'[5]'

2. Create a mask1:
whereami -mask_atlas_region CA_ML_18_MNIA:R:ins
(I used CA_ML_18_MNIA because I normalized the data into MNI space)

3. Resample the mask:
3dresample -dxyz 3.0 3.0 3.0 -prefix resample3 -input CA_ML_18_MNIA.ins.r+tlrc

4. Create a mask2:
3dcalc -prefix ROI -a 'resample3+tlrc' -b 'anova_cluster+tlrc' -expr '(step(a)*b)'

Question1
When I process no.4, I got the FATAL ERROR message "dataset anova_cluster+tlrc differs in size [~voxels] from others [~]"
I'm not clear what I have to check.. even I tried to search other materials.
(- As I understood, I thought when we generate a mask, the values of the regions where we interested in are '1', and the other parts are '0'.
Thus, I thought the voxel size should be same...)
Therefore, in this part, may I ask you that how can I solve the problem?

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i. Create a mask from specific area (because I failed on generating the mask using two data..[above one..])
whereami -mask_atlas_region CA_ML_18_MNIA:R:ins

ii. Resample the mask:
3dresample -dxyz 3.0 3.0 3.0 -prefix resample3 -input CA_ML_18_MNIA.ins.r+tlrc

iii. Tried to extract beta values [actually.. I'm not sure that this function is correct..]
3dmaskave -mask resample3+tlrc stats.s10_REML+tlrc'[4]'

Question2
When I process no.iii, I also get the message that the "Input and mask datasets are not same dimensions!"
Also, I'm not clear whether it is right way to extract the beta values..
Thus, may I ask you that how can I solve this problem? (also extracting the beta values)

Thank you in advance.
DaWoon



Edited 1 time(s). Last edit at 05/30/2017 07:12AM by dawoon.