I've been trying a variety of different things in terms of using cost
function weighting to improve the epi to T1 registration of these images
(eg., upweighting ventricles, downweighting signal loss, etc.) and have
had little success. Given that we don't have fieldmaps, are there any
other possible solutions you can think of?
Once again, we really appreciate your help!
From: Mark Jenkinson [mailto:[log in to unmask]]
Sent: Friday, October 29, 2004 7:44 AM
To: [log in to unmask]
Subject: Re: [FSL] Registration woes
There are some minor tweaks to the cost function weighting
that I'm trying on your data but it might be difficult to
do very well without fieldmap data. Do you, by any chance,
have a fieldmap acquired in this session? The frontal areas
of the brain are quite stretched, I'm afraid, so I think that
is why the registration is not doing well in general. With
a fieldmap I would be able to correct for this stretching.
I will continue to do what I can, but let me know if you
have a fieldmap.
On 27 Oct 2004, at 02:56, Fornito, Alexander wrote:
> Hi Mark,
> Just wandering if you've had a chance to look at the images, and
> you had any comments?
> -----Original Message-----
> From: Mark Jenkinson [mailto:[log in to unmask]]
> Sent: Monday, October 18, 2004 4:53 PM
> To: [log in to unmask]
> Subject: Re: [FSL] Registration woes
> We will look at these this time but please
> DO NOT send large attachments to the list.
> If you absolutely cannot use ftp or the web then send
> large files to us directly, rather than copying them
> to the hundreds of people on the list.
> On 18 Oct 2004, at 06:45, Fornito, Alexander wrote:
>> Hi Mark,
>> We don't have a web page or ftp running at the moment, but I've
>> the initial highres (wholehead epi), highres (that subject's axial
>> and the weight I created to downweight the signal loss as a
>> tar file (< 1M). Hope this is ok.
>> Appreciate all your help!
>> -----Original Message-----
>> From: Mark Jenkinson [mailto:[log in to unmask]]
>> Sent: Friday, October 15, 2004 3:28 PM
>> To: [log in to unmask]
>> Subject: Re: [FSL] Registration woes
>> Hi Alex,
>> OK, sounds like you have done the sensible things.
>> Could you put your images and weighting volumes somewhere
>> for us to download (web page or ftp)?
>> We'll take a look at them at this end and see if there
>> is anything that can be done.
>> All the best,