Energy-Discriminating Gadolinium K-Edge X-ray Computed Tomography System
Energy-Discriminating Gadolinium K-Edge X-ray Computed Tomography System
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DOI：
10.1143/jjap.49.027001
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发表时间：
2010-01-01
影响因子：
1.5
通讯作者：
Onagawa, Jun
中科院分区：
文献类型：
--
作者：
Matsukiyo, Hiroshi;Watanabe, Manabu;Onagawa, Jun
能量判别k边x射线计算机断层扫描（CT）系统是有用的，以提高对比度分辨率的目标区域利用造影剂和减少患者的吸收剂量。CT系统是第一代使用碲化镉（CdTe）的探测器。CT是通过物体的反复平移和旋转来实现的。来自物体的穿透x射线光子由CdTe探测器检测，x射线光子的事件信号由电荷敏感和整形放大器产生。光子能量和能量宽度都是用多通道分析仪选择出来的，光子的数量是用计数器计算出来的。为了进行能量鉴别，研制了一种用于光子计数的低剂量率x射线发生器。其最大管电压为110 kV，最小管电流为1 μ A。在辨能CT中，管电压为100 kV，管电流为20 μ A，在距离源1.0 m处，管电压为100 kV时，x射线强度为2.98 μ Gy/s。通过选择能量刚好超过50.3 keV的光子，对增强的钆k边缘x射线CT进行了论证。(C) 2010日本应用物理学会
An energy-discriminating K-edge X-ray computed tomography (CT) system is useful for increasing the contrast resolution of a target region utilizing contrast media and for reducing the absorbed dose for patients. The CT system is of the first-generation type of detector using cadmium telluride (CdTe). CT is performed by repeated translations and rotations of an object. Penetrating X-ray photons from the object are detected by a CdTe detector, and event signals of X-ray photons are produced using charge-sensitive and shaping amplifiers. Both photon energy and energy width are selected out using a multichannel analyzer, and the number of photons is counted by a countercard. To perform energy discrimination, a low-dose-rate X-ray generator for photon counting was developed. Its maximum tube voltage and minimum tube current were 110 kV and 1 mu A, respectively. In energy-discriminating CT, the tube voltage and tube current were 100 kV and 20 mu A, respectively, and the X-ray intensity was 2.98 mu Gy/s at a distance of 1.0 m from the source and a tube voltage of 100 kV. The demonstration of enhanced gadolinium K-edge X-ray CT was carried out by selecting photons with energies just beyond the gadolinium K-edge energy of 50.3 keV. (C) 2010 The Japan Society of Applied Physics