[MINC-users] mean signal

[Ayman Oweida]

Hi,

I need to be able to obtain the mean signal intensity of an ROI in a brain MR image.  I thought of using Display to select the ROI, then save the selection as .mnc, then running volume_stats on the volume with a mask of the ROI.  However, two problems are associated with that: When running volume_stats on the mask alone, I get dimensions of the mask that are different than when running the mask on top of the volume (e.g. The mask has 9 voxels, but when I run volume_stats on the volume and mask, the # of voxels is now 32!!!), my other problem is that I always get the error: WARNING: Dimensions of RR_ROI_2.mnc do not match those of 0.mnc. Using world coordinates.  What does this imply for my measurements?  

Using mincstats will not work.  I just get the error: Files ROI.mnc and volume.mnc have different sizes of dimensions.

What am I doing wrong?  Is there a simpler way of obtaining signal measurement for an ROI?


Thanks,

Ayman