Hi Ehsan,

I agree with Frank that the ODF's are 'corrupt,' though I'm not sure why they are rendering like they are, which is a DSI Studio question, as min-max normalization should scale these back to normal... From the DKI side, I believe this is occurring when the diffusion tenser is inverted in very noisy voxels with weird eigenvalues. Both of these rendering problems seem to be happening in the periphery, perhaps even skull where the diffusion signal may not be optimized. I believe we need to implement some regularization procedure, perhaps just on the minimum and maximum allowable eigenvalues to correct this. This could be performed just on DT. I will look into this and see if I can come up with a quick fix for this. Future versions of the software should also be able to overcome this rendering error.

Best,

Russell