I was invited to be co-author of a chapter of a new book on radiology. The chapter is about neuro anatomy and the main author is interested in using the images of the patients I have processed in FreeSurfer, to demonstrate the anatomy of the sulcs and gyri, as well as brain structures. I would like to know if that's permitted, since the program is used mainy in research. If so, how should I reference the FreeSurfer?

Thanks, Bruna