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Simulation study on characteristics of information extraction in multiple-image radiography

【摘要】Simulationexperimentswereperformedtoinvestigatethecharacteristicsofinformationextractioninmultiple-imageradiography(MIR)basedongeometricalopticsapproximation.DifferentPoissonnoiselevelswereaddedtothesimulation,andtheresultsshowthatPoissonnoisedeterioratestheextractionresults,withthedegreeofrefraction[USAXS[absorption.TheeffectsofPoissonnoisearenegligiblewhenthedetector’sphotoncountsareabout1000ph/pixel.Awidersamplingrangeallowsmoreaccurateextractionresults,butanarrowersamplingrangehasabettersignal-to-noiseratioforhighPoissonnoiselevels,e.g.,PN(10).ThesamplingintervalcanbesuitablyincreasedwithaminorimpactontheextractionresultsforlowPoissonnoiselevels(PN(10000)).Theextractionresultsareincompletebecauseaportionofthesamplerockingcurveisbeyondthesamplingrange.Thisinducesartifactsintheimages,especiallyforstrongrefractionandUSAXSsignals.TheartifactsarenotobviouswhentherefractionangleandstandarddeviationoftheUSAXSaresmallerthanthesamplingrangebyanorderofmagnitude.Ingeneral,theabsorptionbarelyaffectstheextractionresults.However,additionalPoissonnoisewillbegeneratedwhenthesampleismadeofhigh-Zelementsorhasalargesizeduetothestrongabsorption.Here,theextractionresultswilldeteriorate,andadditionalexposuretimeisrequired.ThissimulationprovidesimportantdetailsonpracticalapplicationsofMIR,withimprovementsininformationextraction.

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10 共11页 核技术:英文版 2018年5期 免费 中文科技期刊数据库

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