新生儿胸部摄影适宜照射野面积与吸收剂量的探讨  

Investigation of reasonable exposure field and acceptable dosage on chest radiography of newborn baby

作　　者：郭斌[1] 于凤珍[2] 于明[1] 宋少娟[2] 曹琰 

机构地区：[1]济南市妇幼保健院,山东济南250001 [2]山东省医学影像学研究所,山东济南250021 [3]山东省医学高等专科学校,山东济南250001

出　　处：《医学影像学杂志》2006年第3期300-303,共4页Journal of Medical Imaging

摘　　要：目的:探讨适宜新生儿胸部摄影的照射野面积及中心线、照射野外各腺体表面的平均吸收剂量。方法:以新生儿尸体为体模、依西门子点数法设计四种照射野,每野112组曝光条件。感光效应E值不变,改变照射野面积及曝光点数,通过448次预采样,分析照射野面积与平均吸收剂量的关系。结果:照射野面积为10cm×12.5cm,9点曝光组的平均吸收剂量最小。结论:适宜新生儿胸部摄影的最大照射野面积为10cm×12.5cm;恰当的曝光条件组合为9点组;允许的平均吸收剂量中心线为≤49.88μGy,未加防护时照射野外的性腺为≤0.070μGy、甲状腺为≤35.9μGy、晶体为≤0.062μGy。Objective： To research the suitable exposure field, center X-ray and skin dosage of some gland organ outside exposure field on the basis of radiography of newborn baby. Methods： A newborn baby＇s corps was take as phantom. According to Siemens E value （sensitivity effciency）, four groups of exposure was designed. Under the same E value, exposure fields and gland-skin doses were measured and studied on chest radiography of newborn baby by 448 pre-examples. Results： Under the condition of exposure field equal to 10cm×12.5cm, skin dose got to the lowest point. Conclusion： On newborn baby chest radiography the reasonable exposure condition is field no more than 10cm×12.5cm, E equal to 9points, most acceptable dose are 19.88μGy （center X-ray）, 0.062μGy （crystalline lens）, 35.9μGy （thyroid gland）, 0.070μGy （gonad）.

关 键 词：新生儿 胸部摄影 接受剂量 西门子点数法 腺体表面 

分 类 号：R722.1[医药卫生—儿科] R814.2[医药卫生—临床医学]