Abstract: A head restraint for immobilizing a patient during tomographic examination. A two part cover, each part enclosing a pneumatic, inflatable member, is adjustably assembled so as to locate each inflatable member on opposite sides of the patient's head. A strap encircles the forehead, maintaining the restraint on the patient. A hand held squeeze bulb simultaneously and equally pressurizes both inflatable members so as to occupy all space between the patient's head and a U-shaped head holder typically provided with tomography X-ray machines. The inflatable members establish a comfortably fitting, flexible, large patch of contact with the patient's head and with the head holder. These characteristics immobilize a patient's head sufficiently to enable clear images to be developed. The inflated members are depressurized by a manual valve, and the restraint is readily removed from the patient.