【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。更多还原

【Abstract】 Objective To estimate dual- source CT effective doses under four different examination protocols. Methods After putting TLDs in the Alderson Radiation Therapy Phantom,we scanned the phantom under two different examination protocols. Then effective doses were calculated with the acquired absorbed doses of organs and tissues. Tissue weighting factors recommended by the ICRP were adopted in the calculation. Effective doses were also calculated using the AAPM recommended method by which the DLP was multiplied by the K factor. Results Effective doses under two different examination protocols were obtained. The effective doses were 3. 66 and 2. 98 mSv respectively when phantom were used. The effective doses were 2.81 and 1. 55 mSv respectively calculated using the K value recommended by AAPM and were all lower than that obtained using phantom. Conclusion Under the head scan mode,the absorbed dose of crystalline lens is high. Effective doses calculated using the method recommended by AAPM were lower than those using the Alderson Radiation Therapy Phantom.更多还原