Dear John,
I have just checked the voxel sizes, origins and direction cosines. The
nPatb0.img and nPatFA.img are in register. So, I guess I will skip the MI
coreg in this case.
Thanks a lot.
Best regards,
Lucullus Leung
Queen Mary Hospital
Hong Kong
----- Original Message -----
From: "John Ashburner" <[log in to unmask]>
To: "Lucullus Leung" <[log in to unmask]>; <[log in to unmask]>
Sent: Wednesday, February 26, 2003 7:58 PM
Subject: Re: Normalization without MI coregistration done (b0 and FA)
>
> > I would like to know if it is okay to spatially normalize b0 and apply
the
> > resultant parameters on FA maps without first doing MI co-registration
> > between b0 and FA maps. Because FA maps are derived from b0, so I
believe
> > that I can skip MI coreg in this case, can't I?
>
> All you need do is ensure that the images are in register. If one image
is
> derived from another, then this should be the case, so coregistration is
> not required. It is possible, however, that the routine you used for
deriving
> the FA map lost the positional information. If this is the case, then you
may
> need to copy .mat files / set origins/voxel sizes etc. Try the Check Reg
> button to see if the images are in register. Alternatively, check that
the
> voxel sizes, origins, and direction cosines are the same using the Display
button.
>
> Best regards,
> -John
>
> --
> Dr John Ashburner.
> Functional Imaging Lab., 12 Queen Square, London WC1N 3BG, UK.
> tel: +44 (0)20 78337491 or +44 (0)20 78373611 x4381
> fax: +44 (0)20 78131420 http://www.fil.ion.ucl.ac.uk/~john
>
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