* The EMH was a holographic simulation of a Human, but with no internal organs beneath the apparent surface to conserve computer power.
* Holodecks used omnidirectional holographic diodes. A sickbay was fitted with a system of OHDs that projected an image of the EMH. Each projected a complete image. Visible portions changed as the hologram moved, creating an illusion of fluid motion.
* Magnetic containment fields allowed the EMH to interact with physical objects. These force fields moved as the EMH moved to create the appearance of solid matter. The containment fields could be shut off, allowing objects and people to pass through them – an EMH’s cohesion could range from solid to intangible.
* When OHDs and magnetic field generators were added to other parts of a ship, they allowed the hologram to leave sickbay (as in more advanced Starfleet ships or modified configurations).
* USS Voyager also discovered the 29th century mobile emitter technology which, when attached to the EMH and program transferred to emitter, would allow EMH to roam freely, but would not be vulnerable to possible damage, on board ship, shuttles or even planetary surfaces. This allowed EMH to act as medical aid during away missions.
* The universal translator algorithm was written into the EMH’s matrix.
* The EMH was a hologram, thus its operations range was limited to the areas with supported holographic generators. On standard spaceships this would mean sickbay and holodecks.
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