| 谭婷婷,杨楠,王春祥.基于年龄计算儿童头部体型特异性剂量评估值的初步研究[J].中华放射医学与防护杂志,2022,42(11):897-902 |
| 基于年龄计算儿童头部体型特异性剂量评估值的初步研究 |
| Preliminary study on calculating size-specific dose estimate values based on age in children's head |
| 投稿时间：2022-06-19 |
| DOI：10.3760/cma.j.cn112271-20220619-00255 |
| 中文关键词: 儿童 头部 计算机体层成像 年龄 体型特异性辐射剂量 |
| 英文关键词:Children Head Computed tomography Age Size-specific dose estimate |
| 基金项目: |
|
| 摘要点击次数: 1142 |
| 全文下载次数: 405 |
| 中文摘要: |
| 目的 探讨利用年龄直接估算儿童头部体型特异性剂量评估(SSDE)值的可行性。方法 回顾性收集2022年1月至3月于天津市儿童医院接受头部CT平扫检查的患儿210例。记录容积CT剂量指数(CTDIvol)、年龄、性别,并通过工作站测量头部中间扫描层面的前后径(AP)及左右径(LAT)、面积及CT值。利用美国医学物理学会(AAPM)第293号报告,计算头部水当量直径DW、fH16measured及SSDEmeasured。使用世界卫生组织(WHO)提供的标准儿童头围与年龄的关系,计算男性和女性儿童的有效直径Deff;WHO。由手动测量数据计算的Deff与DW计算出线性拟合关系,利用该拟合关系计算出Deff;WHO对应的水当量直径DW;WHO,从而计算出对应的头部fH16WHO与SSDEWHO。分别比较男女性别的DW与DW;WHO、fH16measured与fH16WHO的相关性,SSDEmeasured与SSDEWHO的相关性及一致性,分析年龄与fH16WHO的转换关系。结果 DW与DW;WHO的相关性良好(女:r=0.917,P<0.01;男:r=0.873,P<0.01);fH16measured与fH16WHO的相关性良好(女:r=0.916,P<0.01;男:r=0.883,P<0.01);SSDEmeasured与SSDEWHO的相关性良好(r=0.991,P<0.01;男:r=0.992,P<0.01)。SSDEmeasured与SSDEWHO二者一致性良好,最大均方根误差,女性为5.61%,男性为5.25%。并且通过曲线拟合得到了不同性别患者年龄与fH16WHO的转换关系。结论 利用患者年龄可简单准确地估算儿童头部SSDE。 |
| 英文摘要: |
| Objective To investigate the feasibility of size-specific dose estimate of head based on pediatric patients' age.Methods A retrospective study was conducted on plain head CT scans of 210 patients in Tianjin Children' s Hospital from January to March in 2022. The volume CT dose index (CTDIvol) values, age and sex of the patients were recorded. The anteroposterior diameter (AP) and lateral diameter(LAT), aera and CT value in the middle slice of the scan region were measured on the workspace. According to the AAPM reports 220 and 293, the water equivalent diameter (DW) of head,size-specific conversion factors (fH16measured), and size-specific dose estimate (SSDEmeasured) were calculated. The effective diameter (Deff;WHO) was calculated for male and female individuals using the ralationship between the standard head circumference and age of children provided by World Health Organization (WHO). The effective diameter (Deff;WHO) was converted into a water equivalent diameter (DW;WHO), using a correlation established from the Deff and DWwhich were measured in 210 image sets of male and female patients. Then the corresponding fH16WHO and SSDEWHO of head can be calculated. The correlation between DW and DW;WHO, fH16measured and fH16WHO, the correlation and consistency between SSDEmeasured and SSDEWHO, and the conversion relationship between age and fH16WHO were analyzed for male and female patients.Results A significant correlation were found between the measured DW and DW;WHO(female: r=0.917, P<0.01; male: r=0.873, P<0.01), fH16measured and fH16WHO(female: r=0.916, P<0.01; male: r=0.883, P<0.01), SSDEmeasured and SSDEWHO(r=0.991, P<0.01; male: r=0.992, P<0.01). The Bland-Altman test indicated that there was good coherence between SSDEmeasured and SSDEWHO. Maximal mean root-mean-square errors of SSDEmeasured and SSDEWHO were 5.61% in female and 5.25% in male. The conversion relationship between fH16WHO and patient age in different genders was obtained by curve fitting.Conclusion The SSDE of head in pediatric patients can be estimated simply and accurately by directly using the patient's age. |
| HTML 查看全文 查看/发表评论 下载PDF阅读器 |
| 关闭 |
|
|
|