64层螺旋CT颈椎采集模式放射剂量的分析

摘要

Objective To probe the 64-slice spiral CT scanning dose of the cervical spine at the three different acquisition patterns. Methods The same water phantom was chosen to be examinated at 64-slice spiral CT and at differentacquisition patterns: 64 mm×0. 6 mm(A group), 24 mm× 1.2 mm(B group) and 20 mm×0.6 mm(C group). Every group was scanned 30 times. The average volume CT dose index ( CTDIvol) ,scanning time,effective mAs were recorded and the dose length product (DLP), mean effective dose each time were also calculated. Results The CTDIvol in three groups showed:group A ＞ group B ＞ group C. The CTDIvol in group C reduced to 21. 922％ and 18. 58％ comparing with group A and group B, respectively. Conclusion Considering the optimization of radiation dose,the radiation dose in the nerve pattern of 20 mm × 0.6 mm is the smallest to evaluate the patients in cervical trauma with 64-slice spiral CT.%目的 探讨64层螺旋CT 3种颈椎采集模式的放射剂量.方法选用同一水模进行64层螺旋CT检查扫描,扫描范围30 cm,根据采集方式不同,分为3组:分别采用64×0.6 mm(A组)、24×1.2 mm(B组)、20×0.6 mm(C组)采集方式,每组扫描30次.记录每次扫描的平均容积剂量指数、扫描时间和有效球管电流数值,并计算出剂量长度和平均有效剂量.结果 3组平均容积剂量A组>B组>C组;C组平均容积剂量比A组和B组平均容积剂量分别降低21.922%和18.58%.结论 64层螺旋CT 20×0.6 mm采集模式进行颈椎扫描放射剂量最小.