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Spatial resolution and image processing for pinhole camera-based x-ray fluorescence imaging: a simulation study

Nuclear Science and Techniques 2022年第5期33卷 135-153页

作者： Ze He Ning Huang Peng Wang Zi-Han Chen Bo Peng Key Laboratory of Radiation Physics and Technology of the Ministry of Education Institute of Nuclear Science and TechnologySichuan UniversityChengdu 610064China

Spatial resolution and image-processing methods for full-field x-ray fluorescence(FF-xRF)imaging using x-ray pinhole cameras were studied using Geant4simulations with different geometries and algorithms for image reconstruction.The main objectives were:(1)calculating the quantum efficiency curves of specific cameras,(2)studying the relationships between the spatial resolution and the pinhole diameter,magnification,and camera binning value,and(3)comparing image-processing methods for pinhole camera systems.Several results were obtained using a point and plane source as the x-ray fluorescence emitter and an array of 100×100 silicon pixel detectors as the x-ray camera.The quantum efficiency of a back-illuminated deep depletion(BI-DD)structure was above 30%for the xRF energies in the 0.8–9 keV range,with the maximum of 93.7%at 4 keV.The best spatial resolution of the pinhole camera was 24.7μm and 31.3 lp/mm when measured using the profile function of the point source,with the diameter of 20μm,magnification of 3.16,and camera bin of 1.A blind deconvolution algorithm with Gaussian filtering performed better than the Wiener filter and Richardson iterative methods on FF-xRF images,with the signal-to-noise ratio of 7.81 dB and improved signalto-noise ratio of 7.24 dB at the diameter of 120μm,magnification of 1.0,and camera bin of 1.

关键词： Full-field x-ray fluorescence(FF-xRF) x-ray pinhole camera Spatial resolution Image processing

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The beam-based calibration of an x-ray pinhole camera at SSRF

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Chinese Physics C 2012年第1期36卷 80-83页

作者：冷用斌黄国庆张满洲陈之初陈杰叶恺容 Shanghai Synchrotron Radiation Facility Shanghai Institute of Applied Physics

A pinhole camera for imaging x-ray synchrotron radiation from a dipole magnet is now in operation at the Shanghai Synchrotron Radiation Facility （SSRF） storage ring.The electron beam size is derived by unfolding the radiation image and the point spread function （PSF） with deconvolution techniques.The performance of the pinhole is determined by the accuracy of the PSF measurement.This article will focus on a beam-based calibration scheme to measure the PSF system by varying the beam images with different quadrupole settings and fitting them with the corresponding theoretical beam sizes.Applying this method at SSRF,the PSF value of the pinhole is revised from 37 to 44μm.The deviation in beam size between the theoretical value and the measured value isminimized to 4% after calibration.This optimization allows us to observe the horizontal disturbance due to injection down to as small as 0.5μm.

关键词： beam diagnostics x-ray pinhole camera point spread function beam size measurement

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