Hi, there,

I use the following matlab code to find right and left hippocampus in aseg.mgz

%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
filename = 'case_1/mri/aseg.mgz';
[vol, M, mr_parms, volsz] = load_mgh(filename);
hippo_left = find( (vol > 16.99) & (vol < 17.01) );
hippo_right = find( (vol > 52.99) & (vol < 53.01) );
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

I found size(hippo_left, 1) = 3075; size(hippo_right, 1) = 3237;
However, the value I found in aseg.mgz is

3162     3162.0  Left-Hippocampus  
3390     3390.0  Right-Hippocampus 


Why these values are different (3075 < 3162,  3237 < 3390)?

Thanks a lot!

Guang

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