Dear users,
We've drawn some lesion masks using both FSLVIEW and MRICRON. However, ww have noticed a strange mismatch in their output volume for the same masks and subjects. We have noticed that MRICRON changes the voxel dimension as if to make it isotropic. Is there a way that we can prevent it/turn it off? The strange thing is that the multiplication of the "new voxel dimension X number of voxels" is different, please see the "fslstats -V" output below.   
We really like MRICRON drawing feature and we would like to continue using it!
Any help is really appreciated! 
Thank you,
Joselisa

FSLINFO OUTPUT from mask drawn on MRICRON:
data_type FLOAT32
dim1 190
dim2 263
dim3 269
dim4 1
datatype 16
pixdim1 0.999940
pixdim2 0.999940
pixdim3 0.999940

fslstats test_MRICRON -V
19416 19412.478516

FSLINFO OUTPUT from mask drawn on FSLVIEW:
data_type UINT8
dim1 512
dim2 512
dim3 160
dim4 1
datatype 2
pixdim1 0.500000
pixdim2 0.500000
pixdim3 0.999940

fslstats test_FSLVIEW.nii.gz -V
76594 19147.341797 

Choose Help/Preferences and change your maximum dimensions from the default of 384 to a value larger than 512 (the maximum dimension in your image). At the moment, the software is downsampling your data. I would also uncheck the "Reorient images when loading" and "Rotate to nearest orthogonal" as FSL tends to assume your data is oriented precisely the same.