北京生物医学工程

CT-SD16探测器辐射剂量测量原理和参数设定

Principal analysis on radiation dosimetry of CT-SD16 detector and its parameter setting

作者：郑海亮李兴东刘小丽冯树理何宝新段丛漆毅

单位：首都医科大学附属北京世纪坛医院(北京 100038)

分类号：

出版年·卷·期（页码）：2012·31·3（278-282）

摘要：

目的介绍了一种用半导体电离室测量多排CT辐射剂量的原理和方法，为完善我国现有医疗CT检测规范提供技术信息。方法通过介绍X射线辐射剂量计Barracuda的测量原理和多排CT辐射剂量测量的参数设置依据，并结合在Philip Brilliance iCT 256机器上的应用实例，阐述了用半导体电离室的探测器测量多排CT辐射剂量的关键技术。结果基于CT扫描参数合理设置探测器参数后，多排CT辐射剂量空间分布情况得以较好展示。100 mm长杆空气电离室的测量范围远小于多排CT线束覆盖范围，需要对多排CT辐射剂量测量方法和技术进行更新。结论新型探测器有利于揭示多排CT辐射剂量的特性规律。

Objective A mechanism and method of multi-detector or multi-slice CT dosimetry based on semi-conductor slice ionization chamber was introduced to provide technical information for the existing medical CT inspection criterion in China. Methods Through the introduction of X-ray dosimeter Barracuda’s detection principle, the basis of relevant parameter setting, and the application examples of Philip Brillinace iCT 256, the key technologies of multi-slice CT dosimetry was expounded. Results The spatial distribution of CT radiation dosage could be illustrated well by the detector with the slice ionization chamber after proper parameter setting. A pencil ionization chamber with a length of 100 mm was not sufficient to cover the irradiating range by X-ray beam of multi-slice CT, which was expected to renew the detection technology of radiation dosage for multi-slice CT. Conclusions This new detector is helpful to reveal the characteristics of the radiation dosage regularity in multi-slice CT.

参考文献：

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