Okay, thanks for the info!
-Sandra
-----Original Message-----
From: FSL - FMRIB's Software Library on behalf of Stamatios Sotiropoulos
Sent: Fri 9/9/2011 5:19 PM
To: [log in to unmask]
Subject: Re: [FSL] DTI processing differences between 2008 and now?
January 2010.
Cheers,
Stam
On 9 Sep 2011, at 22:12, Woodman, Sandra wrote:
> Stam,
>
> Yes, we'll look more into the min/max values, I think that must be the issue
and
> not FA valuses.
>
> When did FSL 4.1.5 come out?
>
> Thanks!
>
> Sandra
>
>
>
> -----Original Message-----
> From: FSL - FMRIB's Software Library on behalf of Stamatios Sotiropoulos
> Sent: Fri 9/9/2011 4:44 PM
> To: [log in to unmask]
> Subject: Re: [FSL] DTI processing differences between 2008 and now?
>
> Hi Sandra,
>
> I had a quick look at the different code versions since October 2008.
Regarding
> dtifit and the FA calculation nothing has changed, I suspect the changes you
> observe do not reflect differences in the FA values, but differences in the
> min/max values in fslview that define contrast/brightness. If not, please let
us
> know.
>
> Regarding bedpostx, there have been some changes, the major ones have to do
with
> the initialization of the MCMC. These were incorporated in FSL 4.1.5 and in
> later versions.
>
> Cheers,
> Stam
>
>
>
> On 9 Sep 2011, at 21:18, Woodman, Sandra wrote:
>
>> Hi all,
>>
>> We have encountered something with our DTI data and are wondering if
>> anyone else has seen the same thing and if it has an impact on our data.
>> We have been working on a DTI analysis dataset for a few years (a lot of
>> methods development work went into this particular study), and we have
>> recently noticed that the FA maps that were unpacked and preprocessed in
>> October 2008 look, to the bare eye, brighter overall than those processed
>> in October 2009 and later. We tried loading them into the freesurfer
>> tkmedit tool and we did not see much of a difference, so we are wondering
>> if this is simply a visualization issue. We realize that there may have
>> been changes in the version of FSL during this time and/or the software
>> programs themselves, and want to be sure that the data analyzed earlier
>> has been treated in the same way as that which was analyzed later.
>>
>> In addition, we have run tractography on this dataset, and there seem to
>> be more log files in the bedpostx log directory in the sessions that were
>> run more recently. So we are also wondering if something has changed in
>> the bedpostx program between October 2008 and October 2009 that affects
>> the tractography data.
>>
>> Thank you!
>>
>>
>>
>>
>>
>> Sandra
>>
>>
>>
>>
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