本文選題：X射線　切入點(diǎn)：對(duì)比度　出處：《發(fā)光學(xué)報(bào)》2017年07期 　論文類型：期刊論文

【摘要】：X射線數(shù)字化成像系統(tǒng)的不足主要表現(xiàn)在成像末端耦合約束、微焦點(diǎn)約束瓶頸以及單光子成像缺陷與量子噪聲約束等方面,利用傳統(tǒng)的數(shù)字圖像處理手段很難實(shí)現(xiàn)有效的圖像濾波,而復(fù)雜的濾波算法進(jìn)一步限制了其工程使用效果。為了提高X射線成像系統(tǒng)的光學(xué)傳遞能力與系統(tǒng)抗噪聲能力,本文首先以熱激發(fā)X輻射源與X射線像增強(qiáng)器為例,從系統(tǒng)層面探索成像遇到的諸多技術(shù)瓶頸,并在此基礎(chǔ)上提出了一種針對(duì)X射線成像的積分濾波方法。然后,將空間頻率固定的鉛制光柵作為被測(cè)目標(biāo),通過(guò)改變中繼光學(xué)耦合系統(tǒng)的物像關(guān)系使得像方空間頻率在一定區(qū)間內(nèi)連續(xù)改變,進(jìn)而通過(guò)大量的實(shí)驗(yàn)數(shù)據(jù)實(shí)現(xiàn)在不同積分時(shí)間條件下的光學(xué)傳遞函數(shù)精確擬合。接著,分別從光學(xué)傳遞函數(shù)積分效果與歸一化后的基頻傳遞特性的角度驗(yàn)證了該濾波方法可以有效壓制熱觸發(fā)源引入的量子噪聲,避免圖像產(chǎn)生單光子成像缺陷。實(shí)驗(yàn)數(shù)據(jù)表明:該方法可以提升系統(tǒng)成像的光學(xué)傳遞能力。最后,通過(guò)幀疊加與積分濾波的對(duì)比效果驗(yàn)證了該濾波方法的優(yōu)越性。
[Abstract]:The shortcomings of X-ray digital imaging system are mainly reflected in the coupling constraints at the end of imaging, the bottleneck of micro-focus constraints, the defects of single-photon imaging and the constraints of quantum noise, and so on. It is very difficult to realize effective image filtering by traditional digital image processing methods, but the complex filtering algorithm further limits its engineering application effect. In order to improve the optical transmission ability and anti-noise ability of X-ray imaging system, In this paper, the thermal excited X radiation source and the X ray image intensifier are taken as examples to explore many technical bottlenecks encountered in imaging system, and then an integral filtering method for X ray imaging is proposed. The lead grating with fixed spatial frequency is used as the target to be measured. By changing the image relation of the relaying optical coupling system, the spatial frequency of the image square can be continuously changed in a certain range. Then through a lot of experimental data to realize the accurate fitting of optical transfer function under different integral time conditions. From the point of view of the integral effect of optical transfer function and the normalized fundamental frequency transfer characteristics, it is verified that the proposed filtering method can effectively suppress the quantum noise induced by the heat triggered source. The experimental data show that this method can improve the optical transfer ability of the system. Finally, the superiority of the method is verified by comparing the frame superposition with the integral filtering.
【作者單位】： 長(zhǎng)春理工大學(xué)理學(xué)院;
【基金】：吉林省青年科研基金(20140520122JH,20160520114JH) 吉林省科技發(fā)展計(jì)劃重點(diǎn)科技攻關(guān)項(xiàng)目(20150204083GX,20150204049GX) 吉林省教育廳“十三五”科學(xué)技術(shù)研究項(xiàng)目(吉教科2016357) 國(guó)家自然科學(xué)基金青年科學(xué)基金(51602028) 長(zhǎng)春理工大學(xué)科技創(chuàng)新基金(XJJLG-2015-02)資助項(xiàng)目~~
【分類號(hào)】：O434.1;TP391.41

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