[MINC-users] rawtominc & nu_correct difficulties

[Audette, Michel]

The distance issue looks very relevant. This is a very small, high-res volume, with 0.078mm isotropic spacing, so that the longest axis is 38.2mm. Let me try that distance parameter then...

Thanks again, 

Michel


-----Original Message-----
From: minc-users-bounces at bic.mni.mcgill.ca on behalf of Andrew Janke
Sent: Wed 8/1/2007 5:38 PM
To: MINC users mailing list
Subject: Re: [MINC-users] rawtominc & nu_correct difficulties
 
> I can forward to anyone my minc volume, in case someone has an idea what to tweak.
>
> Thanks to Andrew, for your suggestion too. I was about to try that next. Do you think that the byte-vs-short issue is responsible for this underestimation?

It it possible as N3 works by minimising the entropy of a histogram.
It uses a fairly sensitive method to do this so perhaps you are just
getting a restriction of range effect in the calculation of the
entropy of the histogram.

It is always worth a try!

Be sure to adjust the distance parameter if you think there is more
than just base B0 problems in there.  For example for 3T data we
generally reduce the distance to 50-70mm as opposed to the default.



a
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