[MINC-users] Minctracc problem

[Vasiliki N. Ikonomidou]

Hi everybody,

I am trying to register a T2-weighted image to an IR-SPGR one, using the 
following command for calculating the transform:
minctracc -est_center -est_translations -lsq7 -mi t2.mnc spgr.mnc 
t2_2_spgr.xfm -clobber
This worked out fine for most of my datasets, but for four of them, 
after getting the message

WARNING: source volume not UNSIGNED_BYTE, will do conversion now.
Converting: ............................................     (which 
takes forever)

it gives the message

Not implemented yet in cache_volume_range_has_changed()
WARNING: target volume not UNSIGNED_BYTE, will do conversion now.

and then minctracc quits without creating the .xfm file.
mri_info gives both source and target volumes to be SHORT(4). minctracc 
works if I change the cost criterion, but the results are off.

Any suggestions as to what I might be doing wrong?

Thank you,

Vicky