about registration changed SNR of of the original image

[JinDJsuper]

Operating system and version

Ubuntu 20

CPU architecture

x86_64 (PC, Intel Mac, other Intel/AMD)

ANTs code version

2.5.3

ANTs installation type

Downloaded Github release binaries

Summary of the problem

When I use antsRegistrationSyN for simple linear registration to align a case with a template in one direction, I notice that the transformed image appears somewhat blurry, though not very obviously. Whether the signal-to-noise ratio of the original image is changed after registration.

Question 1: Is this blurriness just a visual illusion, or has this change actually occurred? Question 2: Is this phenomenon normal during the linear or nonlinear registration process? Question 3: Will this change affect the subsequent registration results of the transformed image?

Commands to reproduce the problem.

antsRegistrationSyN.sh -d 3 -m case.nii.gz -f template.nii.gz -o case2tem_rigi_ -t a

Output of the command with verbose output.

-

Data to reproduce the problem

case.nii.gz case2tem_rigi_Warped.nii.gz template.nii.gz

[JinDJsuper]

case case warpered data

At the gray-white matter boundary, it feels somewhat blurry, though it might not be very noticeable.But I can indeed feel that it has become blurrier, not as sharp as before.

[ntustison]

Interpolation effects. The warped image is not unexpected in terms of "blurriness".

[JinDJsuper]

Interpolation effects. The warped image is not unexpected in terms of "blurriness".

Thank you I have understand what you're saying. So, this indicates that it's normal, right? I'm worried if this extra warping step will affect the subsequent registration results. This step is meant to align the direction with the template, but it's not absolutely necessary.

[ntustison]

. So, this indicates that it's normal, right?

Yes.

[JinDJsuper]

. So, this indicates that it's normal, right?

Yes.

ok thanks advance