help > Could I use Draw/Descriptive to measure ROI?
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May 26, 2020  06:05 AM | Mavis Zhang
Could I use Draw/Descriptive to measure ROI?
Hi,
  I have with several niis. It is said that I could measure them through MRICron. However, After I drew one ROI region, there were three-line outputs. 
  Could I use Draw/Descriptive to measure ROI? Thanks for your answer!
Attachment: MRicron.docx
May 26, 2020  03:05 PM | Chris Rorden
RE: Could I use Draw/Descriptive to measure ROI?
There are three descriptive lines:
 All voxels ("VOI")
 All non-zero voxels ("VOI <>0")
 All voxels with positive intensity ("VOI >0")

For each, you get the number of voxels (nvox), cubic centimeters (cc), minimum (min), mean (mean) and maximum (max) and standard deviation (SD) for the voxel intensities under the drawing...

Overlay /Users/chris/src/NiiStat/roi/AICHA.nii
Center of mass XYZ 90.35x108.06x87.24
VOI nvox(cc)=min/mean/max=SD: 1153456 1153.46 =8.0000 88.3904 184.0000 = 19.5849
VOI <>0 nvox(cc)=min/mean/max=SD: 1153456 1153.46 =8.0000 88.3904 184.0000 = 19.5849
VOI >0 nvox(cc)=min/mean/max=SD: 1153456 1153.46 =8.0000 88.3904 184.0000 = 19.5849
Mode: 86.00146484375
May 28, 2020  01:05 AM | Mavis Zhang
RE: Could I use Draw/Descriptive to measure ROI?
Thanks a lot! I get your point!
Originally posted by Chris Rorden:
There are three descriptive lines:
 All voxels ("VOI")
 All non-zero voxels ("VOI <>0")
 All voxels with positive intensity ("VOI >0")

For each, you get the number of voxels (nvox), cubic centimeters (cc), minimum (min), mean (mean) and maximum (max) and standard deviation (SD) for the voxel intensities under the drawing...

Overlay /Users/chris/src/NiiStat/roi/AICHA.nii
Center of mass XYZ 90.35x108.06x87.24
VOI nvox(cc)=min/mean/max=SD: 1153456 1153.46 =8.0000 88.3904 184.0000 = 19.5849
VOI <>0 nvox(cc)=min/mean/max=SD: 1153456 1153.46 =8.0000 88.3904 184.0000 = 19.5849
VOI >0 nvox(cc)=min/mean/max=SD: 1153456 1153.46 =8.0000 88.3904 184.0000 = 19.5849
Mode: 86.00146484375