Image registration on segmented images

Dear all,

I try to use the new tool "Medical Registration Estimator" in order to perform image registration between end-inspiration and end-expiration CT-scan (using the tutorial available here)

It did not work so far, maybe because I have to figure out the right parameters for my registration (I am a beginner)

Anyway, I could see that the registration is performed on all the CT-scan. However, I am only interested in lung registration, for which I have segmentation masks.

My question is thus : Is it possible to perform an image registration on a segmented image?

I guess that it may speed up the procedure since the software would only consider defined region of interest instead of the whole CT slices.

Thanks a lot for all the info/tips I could get!

Claire

Answer 1

[Matt J]

My question is thus : Is it possible to perform an image registration on a segmented image?

You could use the segmentation to form a label map (e.g. with bwlabeln) and register those as if they were images. Or, mask away the structures you don't care about.

I guess that it may speed up the procedure since the software would only consider defined region of interest instead of the whole CT slices.

I don't know about that. Registration algorithms usually cannot (and should not) make assumptions that structures will remain confined to a certain ROI. If you cropped the volumes to a region where you knwo the motion occurs, it might help, though.

[Claire Bruna-Rosso]

That is a very wise suggestion, I'll try it and let you know if it works. Thanks a lot!