With the most recent FreeSurfer release, the developers added some ITK-based functionality originally developed for the ANTs toolkit, specifically N4 and an adaptive denoising filter. Although the former has been in ITK for quite some time, the latter is not currently in ITK. And while I’d like to think I write somewhat decent code, I clearly recognize the significant potential improvements and vetting that can be provided by the ITK community and would love for this latter filter to go through the same process. That being said, what is the current mechanism for introducing new functionality to the toolkit?
ETA: I should mention that I wrote an Insight Journal article for this contribution some time ago.