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| 头部CT扫描时受检者剂量研究 | |
| 引用本文： | 冯定华,张增,付引弟,莫亚哄,程祺钧.头部CT扫描时受检者剂量研究[J].核技术,2001,24(11):941-945. |
| 作者姓名： | 冯定华 张增 付引弟 莫亚哄 程祺钧 |
| 作者单位： | 1. 苏州大学核医学院, 2. 香港城市大学 3. 苏州第一人民医院, |
| 基金项目： | 香港城市大学科研基金 (710 0 190 ) |
| 摘 要： | 应用热释光剂量和头部CT剂量监测模体，在日立W-1000型机器上测定了模体中心和距体表1cm处，单层和多层扫描时的剂量分布。给出了单层扫描时，散射线所致剂量与扫描中心距离的拟合方程，分析了用不同积分区间计算CT剂量指数（CTDI）时对结果的影响。为今后进行广泛的CT受检者的剂量监测，推广使用国际电离辐射防护和辐射源安全基本标准（IBSS）推荐的CT受检者剂量指导水平提供统一标准。并对CT剂量监测中一些值得关注的问题进行探讨。 |
| 关 键 词： | 头部剂量监测模体 TLD CT剂量指数 多层扫描平均剂量 放射诊断 头部 CT扫描 辐射剂量 |
| 修稿时间： | 2000年6月20日 |
A study on head dose in computed tomography |
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| FENG Dinghua,ZHANG Zeng,FU Yindi,MO Yahong,CHENG Qijun.A study on head dose in computed tomography[J].Nuclear Techniques,2001,24(11):941-945. | |
| Authors: | FENG Dinghua ZHANG Zeng FU Yindi MO Yahong CHENG Qijun |
| Affiliation: | FENG Dinghua 1) ZHANG Zeng 2) FU Yindi 3) MO Yahong 1) CHENG Qijun 1) 1 |
| Abstract: | The dose profiles at the center and the places 1cm away from the surface of a standard dosimetry phantom of a head were measured with thermoluminescent dosimeters (TLD) by using a Hitachi W-1000 CT system. Regression equations for the scattered radiation dose as a function of the distance from the radiation center were obtained by fitting the measured data. The CT dose index (CTDI) was different from those computed by integrating over different intervals. Some problems worthy of special attention were discussed. This study provides a technical base for CT dose monitoring and promoting application of International Basic Standard of Radiation Protection and The Safety of Radiation Source (IBSS) guide level. |
| Keywords: | Head dosimetry phantom TLD Computed tomography dose index Multiple scan average dose |
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