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FSL  August 2009

FSL August 2009

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Subject:

Re: Smoothing FSL-VBM

From:

Steve Smith <[log in to unmask]>

Reply-To:

FSL - FMRIB's Software Library <[log in to unmask]>

Date:

Sun, 30 Aug 2009 13:16:00 +0100

Content-Type:

text/plain

Parts/Attachments:

Parts/Attachments

text/plain (71 lines)

On 28 Aug 2009, at 18:15, Rajagopalan, Venkateswaran wrote:

> Dear FSL users,
>
> I am new to VBM kind of analysis. I was going through FSL-VBM user
> documentation where it was mentioned that t-statistic map will be
> created for a range of FWHM =4.6 to 9 mm and it was suggested that
> based on t-stats maps one can decide the size of smoothing kernel
> for the data in hand. Can anyone please tell how i can decide i.e.
> what to look for in t-stats map which will help me to decide the
> appropriate smoothing kernel.

Sorry - no, it's not very easy to provide hard rules on this question
- that's why I didn't really like the idea of including these multiple
smoothings in the script - Gwen's away on holiday so I get away with
saying this.... Anyway I generally prefer to stick with the minimal
smoothing, and use TFCE, as discussed in the TFCE paper.

Cheers.



>
> In general also i don't know how to choose an appropriate size for
> smoothing kernel, i read a little bit about Matched filter theorm to
> decide on the selecting the kernel size but couldn't understand much.
>
> Any help in this regard is greatly appreciated.
>
> Thanks in advance.
>
> Regards
> venkateswaran
>
>
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---------------------------------------------------------------------------
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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