Electrical metallic tubing

I don't see why not it will take up more space than regular building wire, so the capacity of the EMT will obviously be reduced

Electrical Metal Tubing

There are many types of conduit used for the containment of electrical wires. PVC is a non-metallic option. If you need something that provides mechanical protection, EMT is a steel conduit with a thin wall. Need even more mechanical protection, you can use rigid conduit. It comes in steel or aluminum, and must be threaded together.