<div dir="ltr"><div>Hi Mrtrix expert,</div><div>I'm new on mrtrix and I'm trying to run dwi2response (using -grad) but it has been days in a loop that said "failed to find SH peak!". Below you can see the output provided by "-info -debug".</div><div><br></div><div><br></div><div>dwi2response [INFO]: opening image "/home/rr480/Code/KirstieDTI/SUB_DATA/22566/DTI/MRI0/dti_ec.nii.gz"...</div><div>dwi2response [DEBUG]: sanitising image information...</div><div>dwi2response [DEBUG]: voxel accessor for image "/home/rr480/Code/KirstieDTI/SUB_DATA/22566/DTI/MRI0/dti_ec.nii.gz" initialised with start = 95, strides = [ -1 96 9216 ]</div><div>dwi2response [INFO]: opening image "/home/rr480/Code/KirstieDTI/SUB_DATA/22566/DTI/MRI0/dti_ec_brain_mask.nii.gz"...</div><div>dwi2response [DEBUG]: sanitising image information...</div><div>dwi2response [DEBUG]: loading image "/home/rr480/Code/KirstieDTI/SUB_DATA/22566/DTI/MRI0/dti_ec_brain_mask.nii.gz"...</div><div>dwi2response: uncompressing image "/home/rr480/Code/KirstieDTI/SUB_DATA/22566/DTI/MRI0/dti_ec_brain_mask.nii.gz"... 100%</div><div>dwi2response [DEBUG]: image "/home/rr480/Code/KirstieDTI/SUB_DATA/22566/DTI/MRI0/dti_ec_brain_mask.nii.gz" loaded</div><div>dwi2response [DEBUG]: voxel accessor for image "/home/rr480/Code/KirstieDTI/SUB_DATA/22566/DTI/MRI0/dti_ec_brain_mask.nii.gz" initialised with start = 95, strides = [ -1 96 9216 ]</div><div>dwi2response [DEBUG]: image "/home/rr480/Code/KirstieDTI/SUB_DATA/22566/DTI/MRI0/dti_ec_brain_mask.nii.gz" unloaded</div><div>dwi2response [DEBUG]: searching for suitable gradient encoding...</div><div>dwi2response [INFO]: found 69x4 diffusion-weighted encoding</div><div>dwi2response [INFO]: Diffusion gradient encoding data clustered into 2 shells</div><div>dwi2response [DEBUG]: loading image "/home/rr480/Code/KirstieDTI/SUB_DATA/22566/DTI/MRI0/dti_ec.nii.gz"...</div><div>dwi2response: uncompressing image "/home/rr480/Code/KirstieDTI/SUB_DATA/22566/DTI/MRI0/dti_ec.nii.gz"... 100%</div><div>dwi2response [DEBUG]: image "/home/rr480/Code/KirstieDTI/SUB_DATA/22566/DTI/MRI0/dti_ec.nii.gz" loaded</div><div>dwi2response [DEBUG]: voxel accessor for image "/home/rr480/Code/KirstieDTI/SUB_DATA/22566/DTI/MRI0/dti_ec.nii.gz" initialised with start = 95, strides = [ -1 96 9216 645120 ]</div><div>dwi2response: initialising response function... Â 100%</div><div>dwi2response [INFO]: Initial response function is [331.3299255 -81.32884216]</div><div>dwi2response: optimising response function.. Â . Â Â dwi2response [DEBUG]: voxel accessor for image "/home/rr480/Code/KirstieDTI/SUB_DATA/22566/DTI/MRI0/dti_ec.nii.gz" initialised with start = 95, strides = [ -1 96 9216 645120 ]</div><div>dwi2response [DEBUG]: voxel accessor for image "/home/rr480/Code/KirstieDTI/SUB_DATA/22566/DTI/MRI0/dti_ec.nii.gz" initialised with start = 95, strides = [ -1 96 9216 ]</div><div>dwi2response [DEBUG]: initialising threads...</div><div>dwi2response [DEBUG]: launching 1 thread "run thread"...</div><div>dwi2response [DEBUG]: launched thread "run thread" [ID 140638269503232]</div><div>dwi2response [DEBUG]: waiting for completion of thread "run thread" [ID 140638269503232]...</div><div>dwi2response [DEBUG]: failed to find SH peak!</div><div>dwi2response [DEBUG]: failed to find SH peak!</div><div>dwi2response [DEBUG]: failed to find SH peak!</div><div>dwi2response [DEBUG]: failed to find SH peak!</div><div>dwi2response [DEBUG]: failed to find SH peak!</div><div>dwi2response [DEBUG]: failed to find SH peak!</div><div>dwi2response [DEBUG]: failed to find SH peak!</div><div>dwi2response [DEBUG]: failed to find SH peak!</div><div>dwi2response [DEBUG]: failed to find SH peak!</div><div>dwi2response [DEBUG]: failed to find SH peak!</div><div>dwi2response [DEBUG]: failed to find SH peak!</div><div>dwi2response [DEBUG]: failed to find SH peak!</div><div>dwi2response [DEBUG]: failed to find SH peak!</div><div>dwi2response [DEBUG]: failed to find SH peak!</div><div>dwi2response [DEBUG]: failed to find SH peak!</div><div>dwi2response [DEBUG]: failed to find SH peak!</div><div>dwi2response [DEBUG]: failed to find SH peak!</div><div>dwi2response [DEBUG]: failed to find SH peak!</div><div>dwi2response [DEBUG]: failed to find SH peak!</div><div>dwi2response [DEBUG]: failed to find SH peak!</div><div>dwi2response [DEBUG]: failed to find SH peak!</div><div>dwi2response [DEBUG]: failed to find SH peak!</div><div>dwi2response [DEBUG]: failed to find SH peak!</div></div>