Hi, I already have structural data (two time points for every subject), which I want to analyse. These were already aligned for other purposes, but this was done "per hand" and is rather approximative. As I tought Siena does align the two brains to each other using the skull, I did not think the actual previous position of the brains would be an issue. But then different aliging of the same brains gave me different results. So now I would like to know, what the preprocessing steps should be, before I apply siena to detect brain volume chage that took place between the two time points.
Greetings,
Shireen
-----Wiadomość oryginalna-----
Od: FSL - FMRIB's Software Library w imieniu Steve Smith
Wysłano: Wt 2008-02-12 10:34
Do: [log in to unmask]
Temat: Re: [FSL] ODP: [FSL] Siena and alignment
Hi - I'm not sure if you are talking about issues relating to data
acquisition or data analysis?
Steve.
On 12 Feb 2008, at 08:27, Shireen, Kwiatkowska wrote:
> Hi,
>
> would then co-registering the two brains in Flirt, using one of them
> as a reference be the appropriate method to acquire perfectly
> aligned brains?
>
> Cheers,
>
> Shireen
>
>
> -----Wiadomość oryginalna-----
> Od: FSL - FMRIB's Software Library w imieniu Steve Smith
> Wysłano: N 2008-02-10 17:30
> Do: [log in to unmask]
> Temat: Re: [FSL] Siena and allignment
>
> Hi, SIENA is all about comparing the same brain from two different
> timepoints after they have been aligned to each other as well as
> possible. So yes, different alignments between the two images are very
> likely to affect the output.
>
> Cheers.
>
>
> On 9 Feb 2008, at 14:50, Shireen, Kwiatkowska wrote:
>
>> Hello!
>>
>> I would like to know how does allignment influence Siena results. I
>> have run Siena with the use of the -m option on differently alligned
>> brains (all other parameters constant) and have obtained slightly
>> different results. Could someone briefly explain why?
>>
>> Cheers,
>>
>> Shireen
>>
>>
>> -----Original Message-----
>> From: FSL - FMRIB's Software Library on behalf of Jessica Kirkland
>> Sent: Fri 2/8/2008 10:24 PM
>> To: [log in to unmask]
>> Subject: [FSL] Modeling a motor response
>>
>> Hi everyone,
>>
>> I am interested in modeling a button-press response, primarily to
>> check for
>> associated motor activation in several subjects who have data that
>> looks
>> somewhat sketchy. I'm wondering if anyone has done this, and if you
>> have
>> recommendations about how to model this for a quick and dirty
>> analysis. I am
>> unsure of the duration I should use to allow for modeling the motor
>> response. Thank you in advance for the advice!
>>
>> Jessica
>>
>
>
> ---------------------------------------------------------------------------
> Stephen M. Smith, Professor of Biomedical Engineering
> Associate Director, Oxford University FMRIB Centre
>
> FMRIB, JR Hospital, Headington, Oxford OX3 9DU, UK
> +44 (0) 1865 222726 (fax 222717)
> [log in to unmask] http://www.fmrib.ox.ac.uk/~steve
> ---------------------------------------------------------------------------
>
---------------------------------------------------------------------------
Stephen M. Smith, Professor of Biomedical Engineering
Associate Director, Oxford University FMRIB Centre
FMRIB, JR Hospital, Headington, Oxford OX3 9DU, UK
+44 (0) 1865 222726 (fax 222717)
[log in to unmask] http://www.fmrib.ox.ac.uk/~steve
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