中华放射医学与防护杂志
中華放射醫學與防護雜誌
중화방사의학여방호잡지
Chinese Journal of Radiological Medicine and Protection
2014年
4期
298-301
,共4页
顾建华%陆秀良%卓维海%范敦煌
顧建華%陸秀良%卓維海%範敦煌
고건화%륙수량%탁유해%범돈황
胸部CT扫描%性腺%结肠%屏蔽效果
胸部CT掃描%性腺%結腸%屏蔽效果
흉부CT소묘%성선%결장%병폐효과
Chest CT scans%Gonad%Colon%Shielding effects
目的 研究儿童胸部CT扫描时腹部的屏蔽方法及其效果.方法 用美国CIRS公司生产的5岁儿童体模代替儿童受检者,在腹部内布放热释光剂量计LiF(Mg,Cu,P),按儿童胸部CT扫描的通常程序对体模进行扫描,测量在无屏蔽、用铅衣覆盖和用铅衣包裹时腹腔内主要器官与组织的剂量.结果 儿童胸部CT扫描时,腹腔内部分器官的吸收剂量可达到数mGy.3种扫描之间,相同位置处的剂量值差异有统计学意义(x2 =16.00,P＜0.05);正面覆盖和包裹屏蔽方式之间的剂量值差异有统计学意义(Z=-2.52,P＜0.05).较之于无屏蔽措施,采用0.35 mm铅衣包裹腹部,可分别降低睾丸和结肠的剂量71.2％和42.3％,采用同样当量铅衣铺盖腹部剂量可降低55.9％和26.1％.结论 开展儿童胸部CT扫描时,使用铅防护衣可有效屏蔽腹部受照,对性腺和结肠的防护具有重要作用,特别是包裹式的屏蔽措施值得推荐.
目的 研究兒童胸部CT掃描時腹部的屏蔽方法及其效果.方法 用美國CIRS公司生產的5歲兒童體模代替兒童受檢者,在腹部內佈放熱釋光劑量計LiF(Mg,Cu,P),按兒童胸部CT掃描的通常程序對體模進行掃描,測量在無屏蔽、用鉛衣覆蓋和用鉛衣包裹時腹腔內主要器官與組織的劑量.結果 兒童胸部CT掃描時,腹腔內部分器官的吸收劑量可達到數mGy.3種掃描之間,相同位置處的劑量值差異有統計學意義(x2 =16.00,P＜0.05);正麵覆蓋和包裹屏蔽方式之間的劑量值差異有統計學意義(Z=-2.52,P＜0.05).較之于無屏蔽措施,採用0.35 mm鉛衣包裹腹部,可分彆降低睪汍和結腸的劑量71.2％和42.3％,採用同樣噹量鉛衣鋪蓋腹部劑量可降低55.9％和26.1％.結論 開展兒童胸部CT掃描時,使用鉛防護衣可有效屏蔽腹部受照,對性腺和結腸的防護具有重要作用,特彆是包裹式的屏蔽措施值得推薦.
목적 연구인동흉부CT소묘시복부적병폐방법급기효과.방법 용미국CIRS공사생산적5세인동체모대체인동수검자,재복부내포방열석광제량계LiF(Mg,Cu,P),안인동흉부CT소묘적통상정서대체모진행소묘,측량재무병폐、용연의복개화용연의포과시복강내주요기관여조직적제량.결과 인동흉부CT소묘시,복강내부분기관적흡수제량가체도수mGy.3충소묘지간,상동위치처적제량치차이유통계학의의(x2 =16.00,P＜0.05);정면복개화포과병폐방식지간적제량치차이유통계학의의(Z=-2.52,P＜0.05).교지우무병폐조시,채용0.35 mm연의포과복부,가분별강저고환화결장적제량71.2％화42.3％,채용동양당량연의포개복부제량가강저55.9％화26.1％.결론 개전인동흉부CT소묘시,사용연방호의가유효병폐복부수조,대성선화결장적방호구유중요작용,특별시포과식적병폐조시치득추천.
Objective To investigate the methods and effects of abdominal and pelvic shielding for pediatric chest CT examinations.Methods The 705-D phantom made by Computerized Imaging Reference Systems (CIRS) was used to replace a 5-year-old child,thermoluminescent dosimeters were set in the abdomen and pelvis to measure the organ and tissue doses.Chest scans were conducted with the routine protocol for pediatric chest CT examinations.Doses to main organs and tissues in the abdomen and pelvis were measured after chest CT scans without lead apron,with lead apron covering anterior of the abdomen and pelvis and with apron wrapping same part,respectively.Results Absorbed doses to some abdominal organs near the irradiation field were up to several mGy in a procedure of pediatric chest CT examination.There were statistically significant differences among the dose values for three different scans at the same location (x2 =16.00,P ＜ 0.05).Statistically significant difference was also found between the dose values for scans,which were measured with wrapping and covering approaches (Z =-2.52,P ＜ 0.05).Compared to the doses in the condition of no shielding,the doses in testis and colon reduced by 71.2％ and 42.3％,respectively,if the abdomen and pelvis was wrapped with a lead apron (0.35 mm Pb),and reduced by 55.9％ and 26.1％,respectively,if the same lead apron was used to cover the anterior of the abdomen and pelvis.Conclusions In pediatric chest CT examinations,the use of a lead apron can effectively shield the abdomen and pelvis,and plays an important role in protection of the gonad and colon.The wrapping measure is worth being recommended.
