發(fā)布時(shí)間：2018-04-08 21:17

  本文選題：X射線(xiàn)光柵成像　切入點(diǎn)：迭代童建算法　出處：《物理學(xué)報(bào)》2017年05期

【摘要】：基于光柵干涉儀的X射線(xiàn)成像技術(shù)可以同時(shí)獲得樣品內(nèi)部的吸收信息、相位信息和散射信息,既保持了傳統(tǒng)X射線(xiàn)衰減成像的優(yōu)點(diǎn),又擁有相襯成像和散射成像的優(yōu)勢(shì).然而基于傳統(tǒng)CT重建算法的X射線(xiàn)光柵成像需要采集大量完整的原始投影數(shù)據(jù),數(shù)據(jù)采集時(shí)間過(guò)長(zhǎng)從而使得物體接受很大的輻射劑量,難以在實(shí)際中應(yīng)用.提出基于傳統(tǒng)代數(shù)迭代重建算法的光柵成像技術(shù).該方法利用現(xiàn)有X射線(xiàn)光柵成像系統(tǒng)采集少量原始投影數(shù)據(jù),基于傳統(tǒng)代數(shù)迭代重建算法,對(duì)旋轉(zhuǎn)變化的相位數(shù)據(jù)進(jìn)行CT重構(gòu),同時(shí)基于傅里葉變換的方法對(duì)微分相位數(shù)據(jù)進(jìn)行相位恢復(fù).模擬和實(shí)驗(yàn)結(jié)果表明,基于少量或不完備的原始投影數(shù)據(jù),該方法能夠準(zhǔn)確重構(gòu)成像對(duì)象的吸收、柑位和散射三維信息,同時(shí)還能對(duì)微分相位切片進(jìn)行高信噪比的相位恢復(fù),得到樣品折射率實(shí)部衰減率,為X射線(xiàn)光柵成像技術(shù)在工業(yè)、生物和醫(yī)學(xué)診斷等領(lǐng)域的應(yīng)用提供理論和技術(shù)支撐.
[Abstract]:The X-ray imaging technology based on grating interferometer can obtain the absorption information, phase information and scattering information simultaneously, which not only keeps the advantages of traditional X-ray attenuation imaging, but also has the advantages of phase contrast imaging and scattering imaging.However, X-ray grating imaging based on traditional CT reconstruction algorithm needs to collect a large number of complete original projection data, the data acquisition time is too long to make the object accept a large amount of radiation dose, so it is difficult to be applied in practice.A raster imaging technique based on traditional algebraic iterative reconstruction algorithm is proposed.This method uses the existing X-ray grating imaging system to collect a small amount of original projection data, and based on the traditional algebraic iterative reconstruction algorithm, the phase data of rotation change is reconstructed by CT.At the same time, the phase recovery of differential phase data is carried out based on Fourier transform.The simulation and experimental results show that the proposed method can accurately reconstruct the three-dimensional information of absorption, position and scattering of imaging objects based on a few or incomplete original projection data, and can also recover the phase of differential phase slices with high SNR.The real attenuation rate of sample refractive index is obtained, which provides theoretical and technical support for the application of X-ray grating imaging in industrial, biological and medical diagnostics.
【作者單位】： 中北大學(xué)信息與通信工程學(xué)院;中國(guó)科學(xué)院上海應(yīng)用物理研究所;
【基金】：國(guó)家自然科學(xué)基金(批準(zhǔn)號(hào):11375257,61301259,U1232205) 中北大學(xué)校學(xué)科研究基金(批準(zhǔn)號(hào):2015110246) 山西省自然科學(xué)基金(批準(zhǔn)號(hào):2015021099)資助的課題~~
【分類(lèi)號(hào)】：TP391.41;O434.1

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