An evaluation of the Y2O3:Eu3+ scintillator for application in medical x-ray detectors and image receptors
An evaluation of the Y2O3:Eu3+ scintillator for application in medical x-ray detectors and image receptors
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DOI：
10.1118/1.597769
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发表时间：
1996-12-01
期刊：
影响因子：
3.8
通讯作者：
Nomicos, CD
中科院分区：
文献类型：
--
作者：
Cavouras, D;Kandarakis, I;Nomicos, CD
研究了Y2O3:Eu3+闪烁体在辐射探测器和医学图像受体中的适用性。Y2O3:Eu3+以实验室制备的不同涂层厚度的屏蔽形式使用。在50-200 kVp的管电压和透射和反射两种观察模式下，测量了屏幕的x射线发光效率。测定了Y2O3:Eu3+荧光粉材料的本征x光转换效率（n(c)）及与光散射、吸收和反射有关的其他参数。这些用于计算不同屏幕涂层厚度和x射线管电压下的图像传输特性，MTF和零频率DQE。测定了Y2O3:Eu3+的发射光谱（613 nm处的窄带峰），并测定了其与几种常用光学光子探测器的光谱灵敏度的兼容性。x射线发光效率随x射线管电压的变化而变化，在所有屏幕厚度下，x射线发光效率在80 kVp左右达到最大值。在175 mg/cm(2)下，涂层厚度分别达到25 μ W m(-2)/mR s（-1）和18 μ W m(-2)/mR s（-1）。本质x光转换效率和图像传输特性与几种商用荧光粉相当：n(c) = 0.095， MTF（0.05）范围在每毫米10到25行对之间，DQE(0)的峰值在0.33到0.14之间，涂层厚度和kVp范围适用于x射线成像。与一些红敏光子探测器的光谱兼容性很好（0.9或更好）。结果表明，Y2O3:Eu3+是一种中等到高综合性能的材料，可用于医用x射线探测器和图像受体。(C) 1996美国医学物理学家协会。
The suitability of a Y2O3:Eu3+ scintillator for use in radiation detectors and medical image receptors was studied. Y2O3:Eu3+ was used in the form of laboratory prepared screens of different coating thicknesses. The x-ray luminescence efficiency of the screens was measured for tube voltages between 50-200 kVp and in both transmission and reflection modes of observation. The intrinsic x ray to light conversion efficiency (n(c)) and other parameters of the Y2O3:Eu3+ phosphor material related to optical scattering, absorption, and reflection were determined. These were used in the calculation of the image transfer characteristics, MTF and zero frequency DQE, for various screen coating thicknesses and x-ray tube voltages. The light emission spectrum of Y2O3:Eu3+ was measured (narrow band peak at 613 nm) and its spectral compatibility to the spectral sensitivity of several commonly employed optical photon detectors was determined. The x-ray luminescence efficiency varied with x-ray tube voltage, attaining maximum value at about 80 kVp for all screen thicknesses. It also varied with coating thickness reaching 25 mu W m(-2)/mR s(-1) and 18 mu W m(-2)/mR s(-1) at 175 mg/cm(2) for reflection and transmission modes, respectively. The intrinsic x ray to light conversion efficiency and the image transfer characteristics were found to be comparable to several commercially used phosphors: n(c) = 0.095, MTF(0.05) ranged between 10 and 25 line pairs per mm and peak values of DQE(0) varied between 0.33 and 0.14 in the coating thickness and kVp ranges useful for x-ray imaging. Spectral compatibility to some red sensitive optical photon detectors was excellent (0.9 or better). Results indicated that Y2O3:Eu3+ is a medium to high overall performance material that could be used in medical x-ray detectors and image receptors. (C) 1996 American Association of Physicists in Medicine.