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首页> 外文期刊>Japanese journal of applied physics >Investigation of dual-energy X-ray photon counting using a cadmium telluride detector and two comparators and its application to photon-count energy subtraction
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Investigation of dual-energy X-ray photon counting using a cadmium telluride detector and two comparators and its application to photon-count energy subtraction

机译：碲化镉探测器和两个比较器对双能X射线光子计数的研究及其在光子数能量减法中的应用

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摘要

To obtain two tomograms with two different photon energy ranges simultaneously, we have performed dual-energy X-ray photon counting using a cadmium telluride (CdTe) detector, two comparators, two frequency-voltage converters (FVCs), and an analog digital converter (ADC). X-ray photons are detected using the CdTe detector with an energy resolution of 1 % at 122 keV, and the event pulses from a shaping amplifier are sent to two comparators simultaneously to regulate two thresholds of photon energy. The logical pulses from a comparator are sent to an FVC consisting of two integrators, a microcomputer, and a voltage-voltage amplifier. The smoothed outputs from the two FVCs are input to the ADC to carry out dual-energy imaging. To observe contrast variations with changes in threshold energy, we performed energy-dispersive computed tomography utilizing the dual-energy photon counting at a tube voltage of 70 kV and a current of 25 μA. Two tomograms were obtained simultaneously at two energy ranges of 20.0-70.0 keV and 33.2-70.0 keV. The photon-count subtraction was carried out using photon energies ranging from 20.0 to 33.2 keV. The maximum count rate was 5.4 kilocounts per second with energies of 20.0-70.0 keV, and the exposure time for tomography was 10 min.
机译：为了同时获得两个具有两个不同光子能量范围的X线断层图，我们使用碲化镉（CdTe）检测器，两个比较器，两个频率-电压转换器（FVC）和一个模拟数字转换器进行了双能X射线光子计数ADC）。使用CdTe检测器以122 keV的能量分辨率检测X射线光子，并将来自整形放大器的事件脉冲同时发送到两个比较器，以调节两个光子能量阈值。来自比较器的逻辑脉冲被发送到由两个积分器，一个微型计算机和一个电压-电压放大器组成的FVC。来自两个FVC的平滑输出被输入到ADC进行双能成像。为了观察阈值能量变化引起的对比度变化，我们使用了在70 kV的管电压和25μA的电流下进行双能量光子计数的能量色散计算机断层扫描技术。在20.0-70.0 keV和33.2-70.0 keV的两个能量范围内同时获得了两个断层图。光子数减法是使用20.0到33.2 keV的光子能量进行的。最大计数率为每秒5.4千次计数，能量为20.0-70.0 keV，断层扫描的曝光时间为10分钟。

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  • 来源
    《Japanese journal of applied physics》 |2014年第10期|102202.1-102202.6|共6页
  • 作者

    Osahiko Hagiwara; Eiichi Sato; Manabu Watanabe; Yuich Sato; Yasuyuki Oda; Hiroshi Matsukiyo; Akihiro Osawa; Toshiyuki Enomoto; Shinya Kusachi; Shigeru Ehara;

  • 作者单位

    Department of Surgery, Toho University Ohashi Medical Center, Meguro, Tokyo 153-8515, Japan;

    Department of Physics, Iwate Medical University, Yahaba, Iwate 028-3694, Japan;

    Department of Surgery, Toho University Ohashi Medical Center, Meguro, Tokyo 153-8515, Japan;

    Central Radiation Department, Iwate Medical University Hospital, Morioka 020-0023, Japan;

    Department of Physics, Iwate Medical University, Yahaba, Iwate 028-3694, Japan;

    Department of Surgery, Toho University Ohashi Medical Center, Meguro, Tokyo 153-8515, Japan;

    Department of Surgery, Toho University Ohashi Medical Center, Meguro, Tokyo 153-8515, Japan;

    Department of Surgery, Toho University Ohashi Medical Center, Meguro, Tokyo 153-8515, Japan;

    Department of Surgery, Toho University Ohashi Medical Center, Meguro, Tokyo 153-8515, Japan;

    Department of Radiology, School of Medicine, Iwate Medical University, Morioka 020-0023, Japan;

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