光电工程
光電工程
광전공정
OPTO-ELECTRONIC ENGINEERING
2010年
3期
44-50
,共7页
X射线同轴相衬成像%成像质量%参数优化%台阶模糊边分布
X射線同軸相襯成像%成像質量%參數優化%檯階模糊邊分佈
X사선동축상츤성상%성상질량%삼수우화%태계모호변분포
X-ray in-line phase contrast imaging%imaging quality%parameter optimization%step blurred edge distribution
采用图像衬度,信噪比,分辨率和探测器抽样数作为X射线同轴相衬成像质量的综合评价标准,针对具有广泛应用意义的台阶模糊边分布特征的物体,提出了参数优化方法并建立了优化流程.通过数值模拟的方式分别对具有广泛代表性的亚微米焦点源、激光驱动微米焦点源及同步辐射源3种X射线源下成像系统的相关参数进行了优化.结果表明,基于优化方法的优化流程很好地完成了3种X射线源的同轴相衬成像参数优化.可见,这种优化方法具有广泛的应用意义,在根据具体情况对方法进行简单修正的基础上,可以完成任意X射线源下对具有台阶模糊边分布特征物体的同轴相衬成像优化工作.
採用圖像襯度,信譟比,分辨率和探測器抽樣數作為X射線同軸相襯成像質量的綜閤評價標準,針對具有廣汎應用意義的檯階模糊邊分佈特徵的物體,提齣瞭參數優化方法併建立瞭優化流程.通過數值模擬的方式分彆對具有廣汎代錶性的亞微米焦點源、激光驅動微米焦點源及同步輻射源3種X射線源下成像繫統的相關參數進行瞭優化.結果錶明,基于優化方法的優化流程很好地完成瞭3種X射線源的同軸相襯成像參數優化.可見,這種優化方法具有廣汎的應用意義,在根據具體情況對方法進行簡單脩正的基礎上,可以完成任意X射線源下對具有檯階模糊邊分佈特徵物體的同軸相襯成像優化工作.
채용도상츤도,신조비,분변솔화탐측기추양수작위X사선동축상츤성상질량적종합평개표준,침대구유엄범응용의의적태계모호변분포특정적물체,제출료삼수우화방법병건립료우화류정.통과수치모의적방식분별대구유엄범대표성적아미미초점원、격광구동미미초점원급동보복사원3충X사선원하성상계통적상관삼수진행료우화.결과표명,기우우화방법적우화류정흔호지완성료3충X사선원적동축상츤성상삼수우화.가견,저충우화방법구유엄범적응용의의,재근거구체정황대방법진행간단수정적기출상,가이완성임의X사선원하대구유태계모호변분포특정물체적동축상츤성상우화공작.
Contrast,signal-to-noise ratio,resolution and sampling are used as an integrated evaluation standard for the imaging quality of the X-ray in-line phase contrast imaging system.The optimization flow of parameters for the proposed optimized method is erected for the object which has the feature of one dimensional step blurred edge distribution widely applied in many fields.The correlative parameters of the imaging systems under the radiation of sub-micrometer sized focus X-ray source,laser-based micrometer sized focus X-ray source and synchrotron radiation X-ray source are optimized by the means of numerical simulation.The outcome shows that the parameter optimization is completed commendably by the optimized flow.It is obvious that the method can be applied to the optimization of each X-ray source based on simple correction if necessary.
