Matter conversion node
The matter conversion nodes were part of the holodeck technology aboard the . They were also identified as holodeck conversion nodes.

In 2371, Tuvok suggested that the holodeck conversion nodes were contamined with photonic energy and that as a result, Harry Kim undergone the process of matter conversion.

When Tuvok and Chakotay disappered like Harry Kim did, B'Elanna Torres was pretty sure that the matter conversion nodes had a malfunction. That photonic energy leaked into the subsystems and damaged the nodes. ()

Holographic technology