[MINC-development] nu_correct ?

[John G. Sled]

Dear Vicka,

nu_correct has a -normalize_field option which forces the field
within the mask region to have mean 1.0.  This is a bit arbitrary,
but makes visualization easier in some circumstances.  Also,
if you find that the results continue to improve by rerunning
nu_correct, then the -iterations and -stop options may be used
to get the same result in a single step.

with regards,

John

Hospital for Sick Children
Mouse Imaging Centre
555 University Ave.
Toronto, Ontario
M5G 1X8
Canada

Phone: 416 813-7654 x1438
Fax: 416 813-2208


On Wed, May 21, 2003 at 11:19:30AM -0400, Vicka Corey wrote:
> One of our users here says he is having problems with nu_correct:
> 
> nu_correct seems to 
> make the volume darker each time it is applied (that is, the output 
> grayscales are smaller than the input ones [....]
> If, for example, the mean of the white matter is 120 before 
> correction, after involking it 3 or 4 times it will be 80, and I would like 
> it to stay constant (or about constant).
> 
> ...can anyone here shed any light on this?
> 
> thanks much,
> --vicka
> 
> Vicka Rael Corey, Ph.D.                         vicka@nmr.mgh.harvard.edu
>              "More fun than a barrel of monkey wrenches!"
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