Global Decreases in MTR
Method
- Took a normal control MTR image and manually lowered the MTR value globally. ie. mincmath -sub -const -1 in.mnc out.mnc
- Blurred (20mm) the newly lowered MTR ie. diffuse -kernel 20 ...
- Compared the newly lowered, blurred MTR with the group of 65 normal controls
- Thresholded using 5% fdr
Gray Surface
1mm Surface
Mid Surface
Focal Decreases in MTR
Method is same as above
Lesion looks like this:
Mid Surface, from -5 to -15
________-5 = 0%_________-6 = 1.2%____________-7 = 6.7%____________-8 = 14.4%__________-9 = 29.0%__________-10 = 38.8%__________-11 = 48.6%_________-12 = 57.5%_________-13 = 64.9%_________-14 = 70.4%_________-15 = 74.1%
Method
- Blur the Raw MTR data on the mid surface with a 20mm kernel
- Subtract the raw image from the blurred image