X-ray or gamma ray systems or devices – Accessory – Testing or calibration
Patent
1982-11-10
1985-10-29
Smith, Alfred E.
X-ray or gamma ray systems or devices
Accessory
Testing or calibration
378210, G01T 116, H05G 126
Patent
active
045504229
ABSTRACT:
A method and apparatus for evaluating the performance of diagnostic x-ray systems. The method consists of using an x-ray generator under standard conditions and making a test x-ray film, for example, of the dental intra-oral type and comparing its density with a calibrated step density strip, using a test tool member consisting of a sleeve-like body with opaque parallel flat top and bottom walls receiving the step density strip slidably therebetween. The flat walls have registering transverse rectangular windows, in the forward parts of which can be exposed a selected density step. The rear portion of the body, between the flat walls, has spacer blocks defining therebetween a transverse channel overlapped by the windows through which the test x-ray film can be inserted to compare its density with that of the selected step density. This can be utilized to determine if the test film density is within an optical density in a desired range including certain steps of the calibrated density strip. The step density tablet can have steps ranging from 0.7 optical density to 1.5 optical density. A metal filter plate may be mounted on one end portion of the tool body of a thickness selected to match the output of the x-ray generator to the response of the film so as to produce a test film of optical density of about 1.00 O.D. when the x-ray system is known to operate satisfactorily.
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Clark, G. L., The Encyclopedia of X-Rays, and Gamma Rays, Reinhold, New York, 7/63, p. 380.
Peterson Richard W.
VanPelt Wilbur F.
Grigsby T. N.
Smith Alfred E.
The United States of America as represented by the Department of
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