[MINC-users] Minctracc problem

[Claude LEPAGE]

Hi,

Some wild suggestion...

Set this environment variable in your shell:

VOLUME_CACHE_THRESHOLD=-1

If you are using an old version of minc2 (2.0.13 or before), then
internal compression was painfully slow.

minctracc -version
minccalc -version

will tell me the version of your minc installation.

Often, we use scripts for registration, which is a sequence of calls
to minctracc following an hierarchical approach with large to small 
steps. Also, I would suggest -lsq6 for same subject scans since a 
scaling may change the size of the head. I believe you want to do
only rotations and translations here.

If you still have problems, you can contact me (with the inputs).

Yours,

Claude


> 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
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