螢光増感による高感度電子X線写真
1976 年 45 巻 2 号 p. 132-137
詳細
1976 年 45 巻 2 号 p. 132-137
The main disadvantage of a conventional electroradiography is the low X-ray sensitivity of the electroradiographic plate. To overcome this disadvantage we have developed a highly sensitive electroradiographic process. The electroradiographic plate is integrally constructed of an upper transparent dielectric layer, a photoconductive multilayer, an inner transparent dielectric layer, a transparent electrode and a phosphor layer. The process forms an electrostatic latent image on the upper dielectric layer by two corona charging steps.
We have succeeded in a great increase of photosensitivity of the photoreceptor. It is possible to utilize the luminescence from a phosphor layer as in the conventional X-ray film. The X-ray sensitivity of the plate with a phosphor layer approaches that of X-ray films.
For medical purposes, a distinct picture of mamma, breast, thyroid gland, bone and skin can be obtained by using an ordinary X-ray tube, wherein the tube voltage is 40_??_90 kVp and dose is 40_??_70 mAs.
