[Insight-users] Registration of two anisotropic volumes

[Yan Yang]

Dear All,

I am very interested in the underlying registration technique in ITK. I realize that ITK registration is done in physical coordinates, all the voxels in two datasets should be transformed to points in physical space before registration. 

1. Generally the number of points in two datasets to be registered are different, are they resampled to the same number of points in ITK registration framework - is there any interpolated point involved during registration? If the two point datasets are in non-uniform grid, how to generate the joint histogram, for example the element h(i, j) in joint histogram represents the number of point pairs which have grey value of i in one dataset, and have grey value of j in the corresponding positions in the other dataset. My question is how to build the corresponding position if the points are on non-uniform grids.

2. Since ITK take into account the voxel size, and use it to compute a scaling factor for transform, is this scaling factor reflected in the final transform matrix?

Many thanks in advance!

Regards,

Yan


-------------- next part --------------
An HTML attachment was scrubbed...
URL: http://public.kitware.com/pipermail/insight-users/attachments/20060207/c0379ed2/attachment.html