By popular request I have included some pictures of an MRI scanner and various exam positions. The featured scanner is a Siemens Espree wide bore 1.5 Tesla scanner. Most MRI machines are not this spacious. If you are claustrophobic you will do well to search your local area for a scanner like this. Most manufacturers now make a wide bore model but few make the bore (tunnel) as short as Siemens does. This particular unit is on a mobile truck and travels between several facilities.
Also: I am the test subject pictured in all of the images. For reference I am 6 feet tall and weigh 185 pounds.
Click the links below to view pictures of different types of MRI's:
Cervial spine MRI
Lumbar spine MRI
*Special thanks to photographer Doug Sharp