频域光相干断层扫描：眼底影像检查技术的新时代

光相干断层扫描（OCT）技术从时域转入频域，使得图像的清晰度增加，分辨率提高。能够更好地观察视网膜各层组织结构及病理改变，并对病变进行三维立体重建，使得黄斑视网膜外界膜、视细胞内外段等改变清晰可见，不仅为临床诊断提供了更为详尽的图像信息，而且还有助于更加深入全面的了解眼底疾病的特征及病理机制，引领我们进入了一个眼底疾病观察的新时代。在应用过程中，需要了解OCT图像不同色彩表达的意义，重视随诊时图像采集部位的一致性。提倡通过频域OCT技术直接地对病变进行动态观察以及对多种眼底影像检查资料进行整合分析是今后眼底影像检查的发展方向。

Optical coherence tomography: a new era of ocular-fundus imageological technology

Optical coherence tomography (OCT) has developed from time-domain into Fourier-domain OCT (FD-OCT) which indicates clearer details and higher resolution of images. FD-OCT can indicate the structure and pathological changes of each retinal layer, and reveal the retinal external limiting membranes and changes of inner-and outer-segment of visual cells by 3D solid reconstruction. FD-OCT not only provide detailed information of the images for the clinical diagnosis, but also help us investigting the characteristics and pthological mechanisms of ocular fundus diseases, which lead us to a new era of technology of observation on ocualr fundus diseases. In the application, we should pay attention to the significance of different colors of OCT images, and focus on the cohenrence of the position in the image acquistion during the follow-up period. Dynamic observation on the lesions by FD-OCT and aggregated anaylsis of resutls of several imageological examination would be the development direction of imageological examination of ocular fundus diseases.