北京生物医学工程

飞利浦iCT_256轴扫剂量特性和剂量安全管理建议

A radiation feature study and dose safety management suggestion on Philips Multislice CT iCT 256 under axial scanning mode

作者：刘小丽郑海亮李兴东冯树理王仁贵段永利

单位：                      首都医科大学附属北京世纪坛医院（北京100038）        

关键词：轴扫；辐射剂量；吸收剂量；剂量长度乘积；多排CT；患者剂量卡

分类号：

出版年·卷·期（页码）：2014·33·3（285-291）

摘要：

目的验证iCT 256执行头部轴扫时辐射剂量机显值准确性,并探讨在该条件下辐射剂量安全管理方案。
方法利用瑞典RTI公司的Solidose 400型辐射剂量计和中国计量科学研究院研制的T6M164型剂量体模（符合
IEC 61223-2-6），按头部轴扫条件重复三次测定剂量体模上5个钟点位的剂量值。结果 ①中心点CTDI100测
量相对偏差在2%以内，而四周点位CTDI100测量相对偏差在20%以内;②CTDIvol实测值比机显值高5%~16%; ③
单次头部轴扫有效剂量在0.86~3.63mGy之间。结论中心点CTDI100的测量重复性好，外围四点位测量重复性
差，且存在实测值略高于机显值的情况。应加强对患者累计辐射剂量的监管。

Objective To verify the reported CTDIvol value and explore dose safety management
protocol of Philips Brilliance iCT 256 under axial scan mode with head protocol.Methods A
pencil dosimeter, Solidose 400 from Sweden RTI Electronics, is utilized to detect radiation
dose index of phantom T6M164 (in compliance with IEC standard 61223-2-6, provided by National
Institute of Metrology of China) when scanned by iCT 256 under head axial protocol.Results
(1)Relative deviation of CTDI100 in the center point is about 2% and those in the peripheral 4
points are about 20%.(2)Tested CTDIvol value is 5%~16% greater than reported value.(3)
Effective absorbing dose during one head axial scanning is about 0.86mGy to
3.63mGy.Conclusions Accuracy of CTDI100 measurement in the center point is better than the
peripheral four points.Tested CTDIvol value might be greater than reported CTDIvol in certain
conditions and supervision on accumulated radiation dose of patient should be recommended.

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