CAJ | 학술논문

基于部分相干光成像理论，结合X射线微分相衬成像特点，给出有限大小焦斑光源物体微分相衬成像干涉条纹强度分布。建立基于吸收光栅微分干涉条纹探测模型，该模型给出可见光探测器探测强度表达式。根据光强分布，提出一种新的相位恢复算法，该算法仅需两幅物体曝光图像，相对旧算法，减少了物体曝光次数，有利于减少物体X射线剂量的吸收。模拟实验验证了该算法的有效性。
기우부분상간광성상이론，결합X사선미분상츤성상특점，급출유한대소초반광원물체미분상츤성상간섭조문강도분포。건립기우흡수광책미분간섭조문탐측모형，해모형급출가견광탐측기탐측강도표체식。근거광강분포，제출일충신적상위회복산법，해산법부수량폭물체폭광도상，상대구산법，감소료물체폭광차수，유리우감소물체X사선제량적흡수。모의실험험증료해산법적유효성。
X-ray phase contrast imaging techniques can directly detect the structure of soft tissues in the medicine, biology and material sciences because those methods can provide higher sensitivity than the conventional X-ray radio-graphy. Based on the partial coherence theory, the intensity distribution of X-ray interferogram with the source of fi-nite focus is presented. The detecting model of visible light detector with absorption grating is built and relative in-tensity of signal is given also. A new phase retrieval algorithm, which needs only two X-ray images of sample, is pro-posed according to the detecting model. The new algorithm helps reduce the absorption of X-ray dose. The computer simulation has been performed to verify the feasibility of our proposed algorithm.