【摘要】 为改善光学相干层析成像(OCT)技术图像的获取速度和灵敏度,搭建了一套基于光谱干涉法的谱域光学相干层析成像系统(SD-OCT).该系统采用宽带光源照明,通过光纤迈克尔逊干涉仪产生物体的干涉图形并被光谱仪采集,物体内部结构图像则由干涉图形的傅里叶变换获得.研究表明,SD-OCT的数据获取速度比传统的OCT系统提高了将近40倍,达到了16 000/s的轴向扫描速率,其灵敏度也改善了20~30 dB.因此,SD-OCT可实现工程和生物材料内部结构的实时三维图像重构.更多还原

【Abstract】 To improve the image acquisition rate and sensitivity of optical coherence tomography(OCT) technique,a spectral-domain optical coherence tomography(SD-OCT) system based on a spectral interferometric is constructed,where a broadband light source is chosen as the illumination source and a Michelson fiber interferometer is employed to generate interference pattern of object collected by a spectrometer.The object inner structure is obtained from the interference pattern by a Fourier transform.It is theoretically stated and experimentally verified that SD-OCT system outperforms the conventional OCT system in acquisition rate and sensitivity.The acquisition rate gets 16 000 axial scans per second and 40 times the conventional OCT;the sensitivity is enhanced by 20-30 dB.As a result,the SD-OCT system enables to realize near real time three dimensional imaging reconstructions of internal structure of engineering and biological materials.更多还原