| 李大伟,周献锋,杨春勇,王进,涂彧,余宁乐.儿童CT检查中扫描参数的优化[J].中华放射医学与防护杂志,2014,34(6):466-469 |
| 儿童CT检查中扫描参数的优化 |
| Optimization of scanning parameters in children CT examination |
| 投稿时间：2013-09-27 |
| DOI：10.3760/cma.j.issn.0254-5098.2014.06.017 |
| 中文关键词: 儿童 CT扫描 剂量 |
| 英文关键词:Children CT scan Radiation dose |
| 基金项目:卫生行业科研专项（201002009） |
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| 中文摘要: |
| 目的 了解儿童CT检查扫描条件选择及其所致辐射剂量的相关性，以期通过适当调节mAs、扫描长度等参数，降低儿童CT检查患者受照剂量。方法 比较江苏省7家医院不同年龄组（<1岁、1~5岁、6~10岁和11~15岁）儿童头颅、胸部、腹部多排螺旋CT检查主要扫描参数的差异。选用相同的检查参数在TM160剂量模体上测量CTDI100，计算DLP，并通过经验加权因子，估算出不同部位检查的有效剂量（E）。对mAs、扫描长度和DLP进行多元线性回归分析，比较两家典型医院由于选择扫描条件不同所导致的剂量差异。结果 儿童头颅、胸部、腹部CT检查所致患者的有效剂量均值分别为2.46、5.69、11.86 mSv，各部位检查DLP与mAs、扫描长度均呈正相关（r=0.81、0.81、0.92，P<0.05）。较高的mAs选择，致使本研究各年龄组儿童胸腹部CT检查有效剂量是德国Galanski等研究的1.2~3.0倍；B医院各年龄组腹部检查选择了较高的扫描长度，以致其所致有效剂量均高于本研究均值。结论 建议通过合理优化儿童不同部位CT检查mAs、扫描长度等扫描参数，降低受检者所受辐射风险。 |
| 英文摘要: |
| Objective To reduce the radiation dose to children from CT scanning through proper adjustment to milliamps (mAs) and scan lengths with a view to learning the relationship between scanning condition and radiation dose. Methods To compare the differences in main scanning parameters used for head,chest and abdomen at multi-detector CT examination of paediatric patients (<1 year old, 1-5 years old, 6-10 years old, 11-15 years old) at seven hospitals in Jiangsu province. CT dose index (CTDI) and dose-length-product (DLP) were gained by using standard children dose model (diameter 16 cm) under the same scanning conditions. Effective doses (E) at different parts of the body from children CT scanning were estimated after modification by empirical weighting factor. Statistical analyses of mAs, scan lengths and DLP were performed with SPSS 16.0 software. The differences in radiation dose due to the choice of condition of scanning were compared between two typical hospitals. Results The mean values of effective doses to paediatric patients during head, chest and abdomen CT scanning were 2.46, 5.69, 11.86 mSv, respectively. DLP was correlated positively with mAs and scan length (head, chest and abdomen examination,r=0.81, 0.81, 0.92,P<0.05). Due to higher mAs used, the effective dose from chest and abdomen CT examination among all age groups was higher than that in Germany Galanski research. Due to larger scanning length in abdominal examination among all age groups, effective doses in hospital were the highest. Conclusions Reasonablely reducing the scan length and mAs during CT scanning could lower children's CT radiation risk, while clinical diagnosis is not affected. |
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