CAJ | 학술논문

目的探讨适合儿童埋伏牙多层螺旋CT(MSCT)检查的低剂量曝光条件.方法 80例经16层螺旋CT检查出埋伏牙的患儿,按曝光量不同分为5、25、125及250 mAs 4组,由放射科2名正主任医师及3名副主任医师采用双盲法评价图像质量,并记录不同毫安秒扫描时的加权CT剂量指数(CTDI_w)、剂量长度乘积(DLP),使用SAS 9.1统计分析系统进行统计学处理.结果 4组的扫描图像均能准确显示埋伏牙结构及其相邻关系.5 mAs扫描组在牙槽突骨小梁及牙龈等周围软组织的分辨能力较25、125及250 mAs组下降,但仍能满足诊断要求.5 mAs组CTDI_w值及DLP值仅为250 mAs组的2%.结论 5 mAs的MSCT低剂量扫描可以满足儿童埋伏牙诊断需要,减少了患儿接受的辐射剂量.
목적 탐토괄합인동매복아다층라선CT(MSCT)검사적저제량폭광조건.방법 80례경16층라선CT검사출매복아적환인,안폭광량불동분위5、25、125급250 mAs 4조,유방사과2명정주임의사급3명부주임의사채용쌍맹법평개도상질량,병기록불동호안초소묘시적가권CT제량지수(CTDI_w)、제량장도승적(DLP),사용SAS 9.1통계분석계통진행통계학처리.결과 4조적소묘도상균능준학현시매복아결구급기상린관계.5 mAs소묘조재아조돌골소량급아간등주위연조직적분변능력교25、125급250 mAs조하강,단잉능만족진단요구.5 mAs조CTDI_w치급DLP치부위250 mAs조적2%.결론 5 mAs적MSCT저제량소묘가이만족인동매복아진단수요,감소료환인접수적복사제량.
Objective To evaluate the radiation dose in both low radiation dose and to conventional radiation dose mode in multislice spiral CT scan for children with embedded teeth,and explore the lowest conditions of exposure in multislice spiral CT scan for children embedded teeth.Methods Eighty cases of children with embedded teeth examined by 16 slices spiral CT were divided into 5 ,25,125 and 250 mAs scanning groups.The scanned pictures of four groups were evaluated by two chief physicians and three associate chief physicians in the radiological department with double blind method.The CTDI_w and DLP in different radiation dose mode were recorded and analyzed with statistics.Results All the four groups scanned pictures in different radiation dose mode could accurately show the structure and the adjacency relation of embedded teeth.Even though the resolution of scanned pictures in S mAs group were inferior to the other three groups on bone trabecula,gingiva and their surrounding soft tissue,it still could meet the requirements of examination.The average DLP in 5 mAs group was only 2% of value in 250 mAs group.Conclusions MSCT in 5 mAs group can not only meet the requirements of examination,but also reduce the radiation dose to patients to the greatest extent.