Thank you!
I will try to find a way to do it!
Thank you all for all advices,
Aga
On 27.08.2007 19:46 Uhr, "Steve Smith" <[log in to unmask]> wrote:
> Hi - it looks like your scanner IS doing the pre-averaging for you -
> you should turn this off!
> Cheers.
>
>
> On 27 Aug 2007, at 17:26, Agnieszka Burzynska wrote:
>
>> Dear all,
>> How can I know if my data is averaged on scanner?
>> I am working on 1.5T Siemens Sonata, I convert my DICOMs using
>> MRIconvert to
>> 4D nifti format. The file I get (before eddy_correct) has just 13
>> volumes
>> (1xb=0 and 12xb=1000), although my NEX is 4.
>>
>> According to the TBSS-related paper (Smith et al., Nat Prot, March
>> 2007) one
>> should avoid on-scanner averaging. Does it mean that after data
>> conversion I
>> should get a file with 13x4 volumes (if I have 12 DW grad
>> directions and 4
>> NEX), then eddy_correct them and average images with the same gradient
>> direction before brain mask creation?
>>
>> Thank you for any suggestion,
>> Best,
>> Aga
>
>
> ------------------------------------------------------------------------
> ---
> 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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