[Insight-users] 3D image registration

[Luis Ibanez]

Hi Grace,

The registration framework of ITK will manage images with non-isotropic
spacing. The registration process is fully done in physical coordinates,
so it is immune to the various spacings of your datasets.

You may want to read details on this in the Image Registration Chapter
of the ITK Software Guide

         http://www.itk.org/ItkSoftwareGuide.pdf

and the Tutorial on registration

http://www.itk.org/CourseWare/Training/RegistrationMethodsOverview.pdf




Each one of the datasets may have different spacings along X, Y and Z,
and different from the other dataset. The datasets can also have
different number of pixels along each dimension.



Than being said....

Acquiring datasets with large inter-slice spacing is just
*BAD-ENGINEERING* ...  very very bad engineering.

Doing this is to let Claude Shannon die in vain,
(along with his sampling theorem).

The practice of acquiring datasets with hight in-plane resolution
and large inter-slice spacing is a bad legacy from the tendency of
clinicians to still look at the datasets slice by slice and fool
themselves with the illusion that the dataset looks great.

Each member of the medical image processing community has the
moral responsibility of educating her/his fellow clinicians on
how bad is to acquire dataset in such poor configurations.
The easiest way to provide that education is to show them how
bad a dataset look like when viewed in an orthogonal view, where
the pixels have anisotropic ratios of 10:1.



    Regards,


       Luis


-----------------
Grace Chen wrote:
> <> Hi all,   I post my question a few days ago and didn't get any 
> feedback.  So, I post my question again in the next pargraph hoping 
> someone today will be able to help me with this problelm.  I am a new 
> ITK user, so my question should be trivial for those who use ITK's 
> registration tools.  Please help!! :>  Thanx!!   ----- Original Message 
> ----- *From:* Grace Chen <mailto:Grace.Chen at swri.ca> *To:* 
> insight-users at itk.org <mailto:insight-users at itk.org> *Sent:* Thursday, 
> September 01, 2005 12:00 PM *Subject:* [Insight-users] 3D image 
> registration
> Hi there,  Good day!   We are using ITK for registering 2D images for 
> our current project.  It's working very nicely for correcting most of 
> the misalignment in our data.  However, we noticed out-of-plant movement 
> in our image data, so we want to extend our project to perform 3D 
> rigid registration.  The data I have is the MR scan for the brain.  The 
> dimension of the image is (256, 256, 8), and the spacing is (0.93mm, 
> 0.93mm, 7mm).
> So, our problem is: since the space between neighbor slices is so 
> distant, can the ITK
> registration program perform 3D registration properly on this type of 
> data? ...or do we have to
> use some additional VTK/ITK tools to cope with that?   If we can use ITK 
> to register our data, can you recommand the registration component good 
> for our data?   Any help is greatly appreciated!! :>   Have a great day! 
>   Grace
> 
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