I.拡大撮影に関する技術的諸問題(第32回総会)

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1. The focal spot size is measured by the usual resolving power measuring method in the subject of a so-called 50 μ X-ray tube (DRX-89H) and also a so-called 100 μ X-ray tube (E7027X). The values measured are slightly greater than the given values. The width of the tube focus is equal to the length. 2. The optimal enlargement ratio in macroradiography is evaluated with modulation transfer function. The Fuji RX-S film, Fuji Hi-screen-STD intensifying screen were used. The Optiker Funk chart was used as the object. When the water phantom of 10 cm in thickness was used, the 7.9 times magnification showed maximum response value at the range of high frequency over 8 Lp/mm at A point (on the table). In case of 7.9 times at point A, at the point B which is located 10 cm above the point A, the 4.7 times magnification was obtained. The MTF of 4.7 times magnification at point B is almost equal to the value of 5.0 times magnification at point A. The response showed the highest value in 9.8 times magnification at point A with water phantom of 2O cm in thickness. 3. The contrast of contrast medium was effected by the thickness of the scatterer. The contrast medium of Angiographin, and Lipiodol Ultrafluid showed slight decrease in contrast with the 20 cm water phantom. 4. The optimal magnification ratio was studied clinically in a point of views of movement of the body and exposure time. In the case of alveolar macroradiography the magnification in optimum was 4 times. In case of lymphography, the magnification in optimum is 4 to 6 times. 5. The macro-tomography is applied mostly to the inner ear study which showed no movement because of the exposure time longer surch as 3.2 seconds. 6. The exposure dose to the patient in macroradiography is 3 times higher when compared to the usual radiography. The exposure field should be minimum as strictly as possible.
公益社団法人日本放射線技術学会の論文
1977-01-01

I.拡大撮影に関する技術的諸問題(第32回総会)

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