X-ray or gamma ray systems or devices – Accessory – Testing or calibration
Patent
1986-12-02
1988-11-29
Church, Craig E.
X-ray or gamma ray systems or devices
Accessory
Testing or calibration
378 18, 378162, 378168, G01T 116, G01N 2302, H05G 126
Patent
active
047887079
ABSTRACT:
The present invention relates to a gauge for use with x-ray machines to calibrate correct technic values (exposure, kilovoltage, processing conditions, etc.) for x-ray film to yield anatomically correct film densities over the visible density range. The gauge accomplishes this by including only four sections. In particular, a first portion for achieving correct film densities at the low end of the visible density range and a second portion for achieving correct film densities at the high end of the visible density range. The gauge also includes at least one region for achieving a slight variation in film density in each of the first and second above-named portions. The gauge may be encased by being cast in plastic of a particular thickness and absorption of x-rays. With this gauge, the radiographer examines film densities at the upper and lower limits of the visible density range to distinguish overexposure, upper limits of correct exposure, correct exposure, lower limit of correct exposure and underexposure.
REFERENCES:
patent: 1953249 (1934-04-01), Michel
patent: 2258593 (1941-10-01), Black
patent: 2426884 (1947-09-01), Kieffer
patent: 4550422 (1985-10-01), Vanpelt
Lin, P. P., "Penetration Quality Measurement for Standardization of Radiographic Image Quality," Medical Physics, vol. 2, No. 1, Jan./Feb. 1975, pp. 5-8.
"Textbook of Dental Radiography", Langland et al., pp. 191 and 193 (Charles C. Thomas, 1973).
Copy of a Trouble Shooting Guide for Dental Radiographic Normalizing & Monitoring Device, copyrighted by Perrygraf/Slide Chart Corp., 1985.
Chomenko Alex
Malamud Herbert
Browdy Alvin
Church Craig E.
Grigsby T. N.
Malamud Ronni S.
Neimark Sheridan
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