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Dear Mark: Thanks for your email. So I have a question regarding Flirt, do you think the affine (12 paramters modal) is better than 6dof method? In my case, sometimes I found the tissue not registered well --- the structures are not aligned well. I may find some images show you later. Thanks again, Ping> Date: Mon, 17 Dec 2007 10:07:03 +0000> From: [log in to unmask]> Subject: Re: [FSL] non-linear registration> To: [log in to unmask]> > Just to add to this:> If you are trying to get registrations within-subject then you > probably don't want to use> non-linear registration unless you are expecting substantial > distortions. For the> within-subject case, 6 dof should be the *correct* degrees-of-freedom > to use, which> can be done with flirt.> > Can you describe more fully in what way that are "not good".> Note that you can only successfully register images that show the > same structures> (albeit with different contrasts). So registering a CBF map (or ADC) > could be> problematic. It is more usual to use an image that is already > aligned (an example> functional or the b=0 weighting diffusion image) for the > registrations and then> transform these other images using the spatial transformation found > by the> previous registration.> > I hope this is helpful.> All the best,> Mark> > > > On 17 Dec 2007, at 09:56, Steve Smith wrote:> > > Hi - FSL 4.0 includes the IRTK nonlinear registration tool; see the > > TBSS scripts for example usage. However you're on your own wrt > > getting this to work on multimodal data, as we've not had much > > experience on this with IRTK.> >> > The next release of FSL will include FNIRT, a generic nonlinear > > registration tool which seems to work really well.> >> > Cheers.> >> >> >> >> > On 14 Dec 2007, at 19:05, Ping Wang wrote:> >> >> Dear FSL users:> >>> >> I have data in this situation: each subject has images from > >> different modalities: T1,T2, ADC, CBF. Now I only consider one > >> subject, I want to register all other modilitiy images to T2 > >> image. I know Flirt only do linear registration, I tested the > >> results by Flirt, some are not good. Should I use non-linear > >> registration? I am wondering which tool in FSL can do non-linear > >> registration? tbss?> >>> >> Thanks, Ping> >>> >> Windows Live Writer，支持离线撰写博客内容，随时随地想写就写。 立即 > >> 使用！> >> >> > ---------------------------------------------------------------------- > > -----> > 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> > ---------------------------------------------------------------------- > > -----> > _________________________________________________________________ MSN 中文网，最新时尚生活资讯，白领聚集门户。 http://cn.msn.com