2. The Application of New Height Tester in Tomography

概要

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Tomography standard lay height be measured by several times exposure in the past. The scale you got it is somewhat higher or lower, also take you long time to calibrate it exactly. The new tomography lay height tester that we designed can tell you the accuracy height of standard lay scale by one exposure. Then put the indicator to mach the scale, all the calibration jop is be finished. The principle of new tester is that make several marks in a certain range and each mark indicate a certain height. Every mark can be distinguished from each other. After one exposure on the film, according the best sharpness one of mark image, decide actual standard lay height scale indicator. The capability of resolution of tester can up to 0.1 mm. Since the accuracy height resolution capability, we can use tester to find out the factors which reffer to the standard lay height. After a quantity of test, we find that different cassette can being 2〜3 mm difference in lay height even same manufacture. Same cassette, the positioning direction is different, lay height may be also different. Dividing use same cassette may get different exposured film. For accuracy tomtography, the best way is use same cassette with same direction for each lay, not be divided to use.
公益社団法人日本放射線技術学会の論文
1993-03-01