| Ce片滤过在基于光子计数X射线骨密度测量中的优势 |
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| 引用本文： | 莫镜清,杜强,李颖锐,吴森,孙明山.Ce片滤过在基于光子计数X射线骨密度测量中的优势[J].CT理论与应用研究,2018,27(5):573-582. |
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| 作者姓名： | 莫镜清 杜强 李颖锐 吴森 孙明山 |
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| 作者单位： | 1. 中国科学院苏州生物医学工程技术研究所医学影像室, 江苏 苏州 215163; |
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| 基金项目： | 国家重点研发计划仪器专项（2016YFF0101303）。 |
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| 摘 要： | K边缘滤过常用于双能X射线骨密度的测量中，但它与不加K边缘滤过时的多能谱光子计数探测器在骨密度测量中的应用还需要进一步的对比、研究。本文选择利用稀土材料铈（Ce）的K边特性，对广谱X射线进行能谱优化，从而获得双能谱，并针对此种情况下的双能谱提出了一种对应的能量-阈值校准方法，希望一定程度上提高骨密度仪中物质分解的准确度。本文对未加Ce时的三能分解、双能分解与加了Ce片后的双能分解做了对比实验。实验结果显示，在未加Ce片滤过时，三能分解精度比双能分解精度高；经过Ce片滤过后，双能分解精度优于所有未加Ce片滤过时的分解精度。
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| 关 键 词： | X射线骨密度测量 K边滤过 能量-阈值校准 物质分解 光子计数探测器 |
| 收稿时间： | 2018-06-04 |
The Advantages of Ce Filtration in the Measurement of Bone Mineral Density Using Photon Counting X-ray Detector |
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| Institution: | 1. Suzhou Institute of Biomedical Engineering and Technology, Chinese Academy of Sciences, Suzhou 215163, China;2. Chinese Academy of Sciences University, Beijing 100049, China;3. Imdetek Corporation Limited, Xi'an 712000, China |
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| Abstract: | K-edge filter is often used in dual-energy X-ray bone densitometry. However, its use with multi-energy bin photon counting detector without Ce and dual-energy with Ce in bone densitometry requires further studies and comparisons. We chose to optimize the spectrum of broad X-ray by using the K-edge characteristic of cerium (Ce) of rare earth material, so as to obtain the dual-energy spectrum. A corresponding energy-threshold calibration method is proposed for dual-energy spectrum in this case, hoping to improve the accuracy of material decomposition in bone densitometry. In this paper, we did a comparison experiment between the triple/dual-energy decomposition without Ce and the dual-energy decomposition after Ce filtration. The experimental results show that the accuracy of the triple-energy decomposition is higher than that of the dual-energy decomposition when without the Ce filtration, and the accuracy of the dual energy decomposition after the addition of Ce filtration is better than that of all the non-Ce filtration obsolete. |
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