摘要目的 估算双源CT两种扫描模式下的有效剂量。方法 在仿真人体模内布放热释光剂量计，分别于两种模式下扫描体模，得到双源CT两种扫描模式下的组织、器官的吸收剂量，并根据国际放射防护委员会（International Commission on Radiological Protection ICRP）103号出版物中推荐的组织权重因子估算受检者的有效剂量。同时采用美国医学物理师协会（American Association of Physicists in Medicine AAPM）推荐的剂量长度乘积（Dose Length Product DLP）乘以K值法估算有效剂量。比较两种方法得到的有效剂量大小。结果 得到两种扫描模式下的有效剂量。两种扫描模式扫描体模估算有效剂量分别为3.66和2.98 mSv。经由AAPM推荐K值计算有效剂量两种扫描模式分别为2.81和1.55 mSv，均低于经体模扫描估算的有效剂量。结论 双源CT头部扫描时眼晶状体吸收剂量较高。AAPM推荐的DLP乘以K值法估算的有效剂量较仿真人法低。
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