Detective quantum efficiency of a double-layered detector for dual-energy x-ray imaging

IF 1.3 4区 工程技术 Q3 INSTRUMENTS & INSTRUMENTATION Journal of Instrumentation Pub Date : 2023-11-01 DOI:10.1088/1748-0221/18/11/c11005
Hubeom Shin, Seungjun Yoo, Seokwon Oh, Junho Lee, Ho Kyung Kim
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Abstract

Abstract A sandwich-like double-layered detector can perform dual-energy imaging (DEI) using a single x-ray exposure without object motion artifacts. The energy separation between measurements obtained from the front and rear-detector layers can be tuned by introducing an x-ray beam-attenuating material between them. However, the design of the interdetector filter significantly influences dose efficiency by altering the number of x-ray photons reaching the rear-detector layer within the sandwich detector. Since the sandwich detector typically incorporates phosphors of differing thicknesses for its two detector layers, it exhibits a unique spatial resolution characteristic in the reconstructed dual-energy (DE) images. To comprehensively assess detector performance in terms of design (filter) and operation (reconstruction), we established a framework that describes the dual-energy detective quantum efficiency (DE-DQE) using linear-systems theory. The developed DE-DQE model was validated through comparison with measurements. The agreement between the modulation-transfer functions was reasonable, and the correspondence between noise-power spectra was excellent. This proposed DE-DQE concept is universally applicable to any linearly operating DE system and holds a significant value in enhancing the performance of sandwich detectors or ensuring their optimal operation.
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双能x射线成像双层探测器的探测量子效率
一种三明治状双层探测器可以在单次x射线曝光下进行双能成像(DEI),而不产生物体运动伪影。通过在前后探测器层之间引入x射线束衰减材料,可以调节从前后探测器层获得的测量值之间的能量分离。然而,探测器间滤波器的设计通过改变夹层探测器内到达后探测器层的x射线光子的数量来显著影响剂量效率。由于夹层探测器通常在其两个探测器层中包含不同厚度的荧光粉,因此它在重建的双能(DE)图像中表现出独特的空间分辨率特征。为了全面评估探测器在设计(滤波)和操作(重建)方面的性能,我们利用线性系统理论建立了一个描述双能探测量子效率(DE-DQE)的框架。通过与实测数据的对比,验证了所建立的DE-DQE模型的有效性。调制传递函数之间的一致性较好,噪声-功率谱之间的对应关系较好。提出的DE- dqe概念普遍适用于任何线性操作的DE系统,并在提高三明治探测器的性能或确保其最佳运行方面具有重要价值。
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来源期刊
Journal of Instrumentation
Journal of Instrumentation 工程技术-仪器仪表
CiteScore
2.40
自引率
15.40%
发文量
827
审稿时长
7.5 months
期刊介绍: Journal of Instrumentation (JINST) covers major areas related to concepts and instrumentation in detector physics, accelerator science and associated experimental methods and techniques, theory, modelling and simulations. The main subject areas include. -Accelerators: concepts, modelling, simulations and sources- Instrumentation and hardware for accelerators: particles, synchrotron radiation, neutrons- Detector physics: concepts, processes, methods, modelling and simulations- Detectors, apparatus and methods for particle, astroparticle, nuclear, atomic, and molecular physics- Instrumentation and methods for plasma research- Methods and apparatus for astronomy and astrophysics- Detectors, methods and apparatus for biomedical applications, life sciences and material research- Instrumentation and techniques for medical imaging, diagnostics and therapy- Instrumentation and techniques for dosimetry, monitoring and radiation damage- Detectors, instrumentation and methods for non-destructive tests (NDT)- Detector readout concepts, electronics and data acquisition methods- Algorithms, software and data reduction methods- Materials and associated technologies, etc.- Engineering and technical issues. JINST also includes a section dedicated to technical reports and instrumentation theses.
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