Converting vector fields into indices matrix

[Cosimo Galeone]

Hi all,
I am very new to plastimatch and I am trying to register a moving image to a reference one.
As results from plastimatch I get the deformable vector fields with the displacement on x,y and z for each voxel.
What I am trying to do is to find the indices of each voxel at which the displacements point.
In this way, I should be able to reproduce the warped image provided by plastimatch.
However, the result is a bit different.
Any tips? Is there a way to have directly the matrix with the indices of the warping from plastimatch?
Thanks,

Cosimo

[Sharp, Gregory C.]

Hi Cosimo,

In most cases, the displacement field will have the exact same geometry as the fixed image. You can verify this by running:

plastimatch header moving.mhd
plastimatch header vf.mhd

Each voxel in the vf is an [x, y, z] tuple, so that means three single precision floats. In most cases, the order of the voxels within the file will be the same in the vf and the image.

I didn't fully understand your question, so my answer might not be helpful. You may give additional context to explain your goal.

Greg


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From: plast...@googlegroups.com <plast...@googlegroups.com> on behalf of Cosimo Galeone <gale...@gmail.com>
Sent: Tuesday, June 14, 2022 12:17 PM
To: Plastimatch
Subject: [Plastimatch] Converting vector fields into indices matrix

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