Analysis of absorption signal and noise in thin phosphor detectors for high-energy transmission radiography

IF 1.3 4区工程技术 Q3 INSTRUMENTS & INSTRUMENTATION

Journal of Instrumentation Pub Date : 2023-10-01 DOI:10.1088/1748-0221/18/10/c10017

Seungjun Yoo, Hubeom Shin, Seokwon Oh, Junho Lee, Hunhee Kim, Ho Kyung Kim

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引用次数: 0

Abstract

Abstract We investigated the detective quantum efficiency (DQE) of thin gadolinium oxysulfide phosphor-based flat-panel detectors (FPDs) using cascaded-systems analysis and Monte Carlo (MC) simulations for applications in megavoltage (MV) x-ray industrial imaging. We decomposed the DQE formula into (dose-independent) upper-limit DQE and (dose-dependent) DQE-reduction factors. We obtained the absorbed energy distributions (AEDs) for various x-ray detector designs and photon energies using MC simulations and applied the AED analysis to the DQE formula. The investigations examined include the x-ray-detector-only DQE and the effect of the coupling efficiency between the x-ray detector and readout panel, including electronic noise, on the upper-limit DQE. This study confirms that the design of the metal build-up layer on the phosphor is effective for MV imaging and emphasizes the importance of designing the readout panel to maintain the upper-limit DQE. We expect the proposed DQE analysis to be suitable for designing and evaluating FPDs for high-energy nondestructive x-ray testing.

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高能透射射线照相用薄荧光粉探测器的吸收信号和噪声分析

摘要利用级联系统分析和蒙特卡罗(MC)模拟研究了薄氧化硫化钆磷基平板探测器(FPDs)在兆伏(MV) x射线工业成像中的探测量子效率(DQE)。我们将DQE公式分解为(剂量无关的)上限DQE和(剂量相关的)DQE还原因子。我们利用MC模拟得到了不同x射线探测器设计的吸收能量分布(AED)和光子能量，并将AED分析应用于DQE公式。研究包括仅x射线探测器的DQE，以及x射线探测器和读出面板之间的耦合效率(包括电子噪声)对上限DQE的影响。本研究证实了荧光粉上金属堆积层的设计对MV成像是有效的，并强调了设计读数面板以保持上限DQE的重要性。我们期望所提出的DQE分析适用于设计和评估用于高能无损x射线检测的FPDs。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

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.