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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。
Objective To estimate the effective dose of dual-source CT in two scanning modes. Methods The thermoluminescence dosimeter was placed in the artificial phantom and the phantoms were scanned in two modes to obtain the absorbed dose of tissues and organs in dual-source CT scanning mode. According to International Commission on Radiological Protection on Radiological Protection ICRP The recommended tissue weighting factor in Publication 103 estimates the subject’s effective dose. The effective dose was estimated by multiplying the value of Dose Length Product (DLP) by the K value recommended by the American Association of Physicians in Medicine (AAPM). Compare the effective dose size obtained by the two methods. The result is the effective dose in both scan modes. The estimated effective doses for the two scanning modes of the scanning phantom were 3.66 and 2.98 mSv, respectively. The effective dose calculated by the AAPM recommended K values was 2.81 and 1.55 mSv, respectively, lower than the effective dose estimated by the phantom scan. Conclusions Dual-source CT has a higher absorbed dose of lens during head scans. The effective dose estimated by the AAPM by multiplying the DLP multiplied by the K-value method is lower than the simulated human approach.