Hi - no, it doesn't - that is part of the initial freesurfer processing
(which estimates white matter and then estimates bias field on the basis
of white matter points), not the format conversion.
ttfn, Steve.
On Thu, 29 Aug 2002, Darren Weber wrote:
Dear Bruce et al,
does mri_convert
p.s. what we do is not really bias field estimation/correction, but
something much more aggressive, really a pre-segmentation, which accounts
for bias fields as well as tissue inhomogeneity. If what you want is really
the bias field for some other purpose, you're probably better of using the
EM
I am referring to a command line option to mri_convert:
--unwarp-gradient-nonlinearity ...
- Original Message -
From: Bruce Fischl [EMAIL PROTECTED]
To: [EMAIL PROTECTED]
Sent: Thursday, August 29, 2002 9:30 PM
Subject: Re: RF bias correction with mri_convert
p.s. what we do
on just the RF bias corrected
volume.
Cheers, Darren
- Original Message -
From: Bruce Fischl [EMAIL PROTECTED]
To: [EMAIL PROTECTED]
Sent: Thursday, August 29, 2002 9:30 PM
Subject: Re: RF bias correction with mri_convert
p.s. what we do is not really bias field estimation/correction
Message -
From: Bruce Fischl [EMAIL PROTECTED]
To: [EMAIL PROTECTED]
Sent: Thursday, August 29, 2002 9:30 PM
Subject: Re: RF bias correction with mri_convert
p.s. what we do is not really bias field estimation/correction, but
something much more aggressive, really a pre-segmentation
: Thursday, August 29, 2002 8:16 PM
Subject: Re: RF bias correction with mri_convert
Hi Darren,
I think you'll find that this option refers to the fact that the
gradients in many of the latest generation MRI systems from several
manufacturers are not exactly linear, particularly in z
Hi Anders,
Many thanks for this reply. We have been grappling with the
non-linearity on our new Sonata systems, and will face the same hurdle
with our 4T (Sonata gradients). Would it be possible to continue the
discussion off-list about your correction procedure and how it is
implemented in
Dear Bruce et al,
does mri_convert automatically apply RF bias field estimation/correction?
If it can do the RF bias correction, what is the best command line option
for this?
Take care, Darren
--
Darren Weber, PhD Student
Cognitive Neuroscience, School of Psychology
Flinders University of
