This
http://scholar.google.ca/scholar?q=brain+mri+ventricles&hl=en&btnG=Search&as_sdt=1%2C5&as_sdtp=on
will certainly give you your first word. You may find the second by reading some of the abstracts. As you can see, I searched for brain MRI ventricles -- looking for what I knew and hoping that the remainder would come up in one of the articles.
Google scholar is an extremely useful resource for stuff like this.
http://scholar.google.ca/Hmmm. When I previewed this, the google page didn't show as a link, but you can get to it by going to the second link and entering
brain MRI ventricles
in the search box.
HTH
happy monday
carol