In order to make my graduation thesis fully repeatable, I'm making the IVUS plugin available. This ImageJ plugin adds the functionality to slice an image frame sequence in 4 directions, so that longitudinal segmentation may be applied. It is used for Coronary Intravascular ultrasound images.
The download is available here http://sourceforge.net/project/showfiles.php?group_id=171446&package_id=195893&release_id=475672 under the ivussnakes package in IVUS Plugin release.
Enjoy it!