Multi-energy X-ray Imaging Technique and Its Application in Computed Tomography
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摘要: 随着探测器技术的不断发展,具有能谱分辨能力的光子计数探测器成为人们研究的焦点,并在X射线成像领域开始得到应用。使用该种探测器,可以将具有较宽能谱分布的X射线分为不同的能区分别进行计数,获得详细的能谱信息及不同能量射线的衰减信息,由此引出了“多能谱成像”的概念。本文介绍了近些年来光子计数探测器技术的发展及其在X射线成像中的应用,同时分析了多能谱技术应用于CT成像所带来的一些优势,如降低辐射剂量、提高信噪比、提高物质识别精度、提高造影剂成像效果等。目前,许多研究机构都致力于研究更快速的电子学设备,以适应高计数率下快速成像的需求,随着多能谱成像技术研究的不断深入,必将为X射线成像及CT领域带来许多新的变革。Abstract: With the rapid development of X-ray detectors,photon counting energy dispersive detectors become more and more popular in X-ray imaging area. Using this kind of detectors,a polychromatic X-ray spctrum can be seperated into different energy regions and the photon number in each energy region can be counted independently,thus attenuation coefficients under different photon energies can be obtained. Multi-energy X-ray imaging technique opens up new perspectives within the fields of X-ray imaging. This paper introduces the latest development of photon counting X-ray detector and its application in medical imaging. Also some advantages of this technique in CT imaging are presented in this paper such as dose reduction,SNR improvement and precision improvement of material discrimination. Recently,a lot of research institutes are dedicated to faster electronic device and readout chip for photon counting detectors. With the rapid development of multi-energy imaging,it will bring a large revolution for X-ray imaging.
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