Panoramic dental radiography image intensification employing min

Details Panoramic dental radiography image intensification employing min Panoramic dental radiography image intensification employing min

1979-11-09

1981-09-01

Smith, Alfred E.

Radiant energy

Fluent material containment, support or transfer means

With irradiating source or radiating fluent material

250487, G01N 2300, G01T 100

Patent

active

042874238

ABSTRACT:
Panoramic dental x-ray machine wherein an x-ray source-camera assembly orbits a patient seated thereinbetween. A slot in the camera assembly collimates the x-rays which are continuously generated by the x-ray source, which x-rays are converted to light images of the patient's dental arch structure by only a single intensifying screen which remains stationary. This screen comprises about 1/40 the area of conventional intensifying screens and is made thicker for providing improved detection efficiency. A fiber optic minifying lens reduces the size of the image from the screen while proportionately increasing the light intensity of the image, thus making it possible to provide useable film images at reduced x-ray exposures due to non-linear film exposure versus optical density characteristics. The resultant minified, light-intensified image may now be recorded on 35 mm roll film, for example, as opposed to standard radiographic film of 5".times.12" size, or 12.70 cm.times.30.48 cm.

REFERENCES:
patent: 2433129 (1947-12-01), Land
patent: 2510965 (1950-06-01), Draeger et al.
patent: 3448276 (1969-06-01), Witte
patent: 3461332 (1969-08-01), Sheldon
patent: 4015126 (1977-03-01), Herrington
Kapany, "Fiber Optics: Principles and Applications," Academic Press, N.Y., 1967, pp. 238-241.

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