A novel panoramic machine for photofluorography

To describe the main features of a prototype panoramic X-ray machine modified for photofluorography.

The prototype PTM 2001 (Asahi Roentgen, Kyoto, Japan) consists of a conventional panoramic machine with a modified X-ray generator and incorporating a 9-inch image intensifier and a photofluorographic camera.

The photofluorographic panoramic radiograph is reduced in size by 60% compared with conventional images. Using 10 cm x 45.7 m photoradiographic film 250 panoramic images can be continuously obtained. Examination time is shorter since cassette changes are not necessary. The radiation dose-in-air, measured in front of the secondary collimator, is 174 muGy.

The advantages of the photofluorographic panoramic radiography include cost economy, shorter examination time and lower radiation exposure.