MRI stands for magnetic resonance imaging. This imaging technique uses magnets to generate electromagnetic fields. These fields pick up information and create a series of “sliced” images. These are much like the images you see in a CT scan, but with much more detail. This is an advanced imaging device and is costly to buy, maintain, and use. That’s why you will likely only find MRI machines in university hospitals or large specialty hospitals. Dogs almost always require general anesthesia during an MRI.