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无论是诊断用X光机与治疗用X光机,在其照射之中所出的X线和物质作用的结果均会产生次级射线:散射线、标识射线和微粒射线.其中散射线在诊断与治疗中的意义是分别予以消除和利用.在诊断中由于散射线的作用,致使X光胶片灰暗,投照部位在X光胶片上的成像之结构与层次不清,对比度差,给诊断带来很大困难.其散射线的多少除了与原发X线量与质有关外,还与被投照的部位密度、厚度及面积成正比例关系,即投照部位密度越高、越厚,面积越大,散射散线亦越多.
Both the X-ray machine for diagnosis and the X-ray machine for treatment, as a result of the action of the X-ray and the substance in the irradiation thereof, secondary rays are generated: scattered rays, identification rays, and particle rays, And the significance of the treatment are respectively to be eliminated and used in the diagnosis due to the role of scattered lines, resulting in X-ray film dark, projection site in the X-ray film on the imaging structure and level of unclear, poor contrast, to the diagnostic tape To a lot of difficulty.The number of scattered lines in addition to the amount and quality of the primary X-ray, but also with the projected site density, thickness and area is directly proportional to the proportion of the projection site density, the more thick, the area The larger the scattering scattered more.