| 陈鑫,张卫媛,卓维海.特定照射条件下儿童心血管介入诊疗的受照剂量研究[J].中华放射医学与防护杂志,2021,41(3):199-204 |
| 特定照射条件下儿童心血管介入诊疗的受照剂量研究 |
| Estimation of patient doses in paediatric cardiovascular interventional radiology under specific exposure conditions |
| 投稿时间：2020-12-31 |
| DOI：10.3760/cma.j.issn.0254-5098.2021.03.008 |
| 中文关键词: 心血管介入 器官剂量 蒙特卡罗方法 剂量面积乘积 照射野 |
| 英文关键词:Cardiovascular intervention Organ dose Monte Carlo method Dose area product Field of view |
| 基金项目:Shanghai Municipal Commission of Health and Family Planning (20174Y0140) |
|
| 摘要点击次数: 1991 |
| 全文下载次数: 1083 |
| 中文摘要: |
| 目的 估算在特定照射条件下不同年龄段儿童接受心血管介入诊疗时主要器官的受照剂量和有效剂量，探讨影响估算受照剂量的主要因素。方法 基于国际放射防护委员会（ICRP）第143号出版物提供的儿童参考人可计算体模数据，建立心血管介入诊疗的特定照射模型，利用蒙特卡罗方法与MCNPX 2.7.0软件模拟计算1、5、10和15岁儿童在接受心血管介入诊疗时主要器官的吸收剂量和有效剂量；为验证计算方法的可靠性，使用美国CIRS公司生产的5岁儿童物理模体ATOM 705-D进行器官剂量的测量验证。结果 我国标准推荐的1、5和10岁儿童参考人的身高和体重与ICRP的推荐值基本相同，我国标准推荐的15岁儿童参考人身高和体重与ICRP的推荐值最大相对偏差也仅为-1.9%和-5.7%；在焦点到影像接收器距离（SID）为90 cm、正方形视野（FOV）边长为30 cm、剂量面积乘积（DAP）为45 Gy·cm2的照射条件下，5岁儿童体模照射野内主要器官剂量的计算值与测量值相差在±6.7%内；在相同照射条件下，儿童年龄越小，其主要器官剂量和有效剂量越大，4个年龄段儿童的有效剂量差异可达近5倍；器官剂量与DAP值的剂量转换系数不仅与儿童年龄密切相关，而且还受照射野面积大小影响。结论 结合儿童参考人可计算体模和照射模型，蒙特卡罗方法可用来计算儿童心血管介入诊疗时的受照剂量；准确估算儿童心血管介入诊疗的受照剂量，需要DAP值、照射野面积和射束投照方向等信息。 |
| 英文摘要: |
| Objective To estimate the organ doses and effective doses to different-age children during cardiovascular interventional radiological procedures under some specific exposure conditions, and explore the main influencing factors on the doses. Methods Based on the paediatric reference computational phantoms recommended in the ICRP Publication 143, several specific exposure models of cardiovascular intervention were built, and the Monte Carlocook MCNPX 2.7.0, was used to calculate the organ doses and effective doses for 1-, 5-, 10- and 15-year-old children. To validate the simulation result, an experiment was implemented by putting the thermoluminescent dosimeters in a 5-y old phantom (ATOM 705-D) manufactured by the CIRS Inc. in the USA. Results Both the height and weight of the reference children for 1-, 5- and 10-year-old provided for by Chinese national standards are nearly in consistency with those recommended by ICRP, and even for the 15-year-old, the maximum relative deviations of the height and weight are only -1.9% and -5.7%, respectively. Under the exposure condition where the focal spot to image receptor distance (SID) was 90 cm, the length of square field of view (FOV) was 30 cm with a dose area product (DAP) of 45 Gy·cm2, the relative deviations between simulated and measured doses to main organs/tissues within the irradiation filed were within ±6.7%. Under the same exposure conditions, the younger the children, the larger the organ doses and effective doses, and the effective doses could vary by a factor of about 5 among the 4 age groups. The conversion coefficient between the organ dose and the value of DAP was not only closely related to the age of children, but also affected by the FOV. Conclusions In combination with the paediatric reference computational phantoms and the exposure models of cardiovascular intervention, the Monte Carlo method can be used to calculate the doses to children undergoing cardiovascular interventional radiological procedures. The information on the values of DAP and FOV as well as the directions of projection are needed for more accurate estimation of the exposure doses. |
| HTML 查看全文 查看/发表评论 下载PDF阅读器 |
| 关闭 |
|
|
|