From panoramas.dk...

Week 11 2003 Inside mouth of Dr John Riley

This X-ray was made using a Soredex Cranex panoramic x-ray machine at the office of Dr. Joseph K. Lever in Spartanburg, SC, USA. This machine places an x-ray source on one side of the head and film on the other. The source and film are rotated through 360° while the film is being exposed.

  thanks to boingboing