Q: I was hoping you could help me with a problem I’ve been having with nu_correct. I have been trying to use nu_correct and the rawtominc for inhomogeneity correction in my spgr images. The rawtominc conversion comes out fine since I have been able to confirm the results in the minc display.

However, when I try to run nu_correct on the now mnc format spgr, it keeps on giving me an error message. I included the call to nu_correct (in red) that I used as well as the error message (in blue) that I received after running it.

$ nu_correct -clobber -V1.0 TACO_work.mnc TACO_workout.mnc
Processing:…………………………………….Done
Not implemented yet in cache_volume_range_has_changed()
Not implemented yet in cache_volume_range_has_changed()
function: field_CV()
Field standard deviation not defined
nu_correct: crashed while running nu_estimate_np_and_em (termination
status=65280)
http://www.bic.mni.mcgill.ca/pipermail/minc-users/2008-September/002176.html

A:It is very difficult to guess the cause of the error. The easiest way would be to place the mnc file on your home page where I can retrieve it so that I can try to reproduce the error here. Hopefully, this is not sensitive data. If you cannot provide data for testing, then try to do a mincstats, mincinfo on the image and send it to me directly. Also indicate on which platform you are running nu_correct. Linux, OS-X, other? version of o/s?