Comparative dosimetry of dental cone-beam computed tomography and multi-slice computed tomography for oral and maxillofacial radiology

目的 比较口腔颌面锥形束CT与螺旋CT在扫描口腔颌面部相同部位时的辐射剂量,为临床安全有效应用提供实验数据.方法 使用热释光剂量芯片测量两种口腔颌面锥形束CT和一种螺旋CT在扫描头颈部体模上颌、下颌、上颌+下颌时的吸收剂量.按照国际放射防护委员会2007年推荐的组织权重因子,计算各个扫描程序的有效剂量.使用单因素方差分析对所有扫描程序得到的有效剂量进行比较分析,P＜0.05为差异有统计学意义.结果 两种口腔颌面锥形束CT的辐射剂量范围41.8 ～249.1 μSv.螺旋CT对上颌、下颌及上颌+下颌进行扫描时的有效剂量分别为506.7、829.9和1066.1 μSv,螺旋CT辐射剂量显著高于两种口腔颌面锥形束CT(P ＜0.001).同一机型仅进行上颌或下颌扫描的辐射剂量显著低于同时扫描上颌+下颌时的辐射剂量(P值分别为0.003和0.001).结论 在对口腔颌面部相同区域进行扫描时,以上两种口腔颌面锥形束CT的辐射剂量均比螺旋CT低；而两种口腔颌面锥形束CT的辐射剂量会因曝光参数的不同而有所差异.Objective To compare the effective radiation dose levels of cone beam computed tomography (CBCT) with those of multi-slice computed tomography (MSCT) when scanning the same maxillofacial regions.Methods The effective doses of 2 CBCT( NewTom 9000 and DCT Pro) and 1 MSCT (bright speed edge select 8 slice) scanners were calculated using thermoluminescent dosimeters (TLD) that were placed in a head and neck phantom,and expressed according to the International Commission on Radiation Protection(ICRP) 2007 guidelines.Results Effective dose values ranged from 41.8 to 249.1 μSv for CBCT.The doses of MSCT scanning for maxilla,mandible and maxilla + mandible were 506.7,829.9 and 1066.1 μSv,respectively.Dose levels of scanning only for maxilla or mandible were significantly lower than those for maxilla + mandible.Conclusions When scanning the same maxillofacial regions,the dose levels for NewTom 9000 and DCT Pro CBCT images were lower than those for Bright speed edge select 8 slice MSCT images.Dose levels reduction could be obtained when smaller regions were scanned.PubMed中文核心期刊要目总览(PKU)中国科技核心期刊(ISTIC)中国科学引文数据库(CSCD)010595-5994