摘要
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41．8～249．1ixSv。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1066．1μSv，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 p, Sv, 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.
出处
《中华口腔医学杂志》
CAS
CSCD
北大核心
2011年第10期595-599,共5页
Chinese Journal of Stomatology
关键词
辐射剂量
体层摄影术
螺旋计算机
锥形束CT
Radiation dosage
Tomography,spiral computed
Cone beam computed tomography
