While working on a way to separate Tuvok and Neelix following their transporter accident, The Doctor referred to the use of barium as a contrast agent for the "primitive imaging technology called x-rays." (VOY: "Tuvix")
This article or section is incomplete This page is marked as lacking essential detail, and needs attention. Information regarding expansion requirements may be found on the article's talk page. Feel free to edit this page to assist with this expansion.