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在Ｘ射线摄影检查中，当管电压、曝光量和焦皮距不变时，受检者的受照剂量主要取决于照射野的大小。目前美国、日本等发达国家照射野与胶片面积之比一般仅为１．２［１］。而我国基层医院用５０ｍＡＸ射线机作胸部摄影时，照射野与胶片面积之比为２～１０，平均４左右［２...
In the X-ray examination, when the tube voltage, exposure and focal length unchanged, the subject dose depends on the size of the radiation field. At present, the ratio of the field of exposure to the area of film in developed countries such as the United States and Japan is only 1.2 [1]. The grass-roots hospitals in our country 50mAX ray machine for chest photography, irradiation field and film area ratio of 2 to 10, an average of 4 or so [2 ...