Hi - that's right in general, although may not be true for _all_ subjects
fed into SIENA.
Cheers.
On Tue, 12 Oct 2004, Michela Pievani wrote:
> Hi, I am a new FSL tool user and I am doing a longitudinal study of atrophy with Siena; I am a little confused about change analysis carried out by siena.
> For every patient I have image1 at timepoint1 and image2 at timepoint2; i pass the input image in the following order:
> siena image1 image2
> Suppose that the patiens are atrophic; siena_diff is run twice:
> 1. the first time siena_diff calls FAST on image2 (registered and masked) and estimates pbvc_backward: this should be a positive value (because of atrophy)
> 2 the second time FAST segments image1 (registered and masked) and pbvc_forward should be a negative value
> I'm right?
> Thanks a lot for your help.
>
> Michela
--
Stephen M. Smith DPhil
Associate Director, FMRIB and Analysis Research Coordinator
Oxford University Centre for Functional MRI of the Brain
John Radcliffe 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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