认识光相干断层扫描血管成像技术特色，提升光相干断层扫描血管成像技术临床应用水平

Clinical applications of optical coherence tomography angiography

光相干断层扫描（OCT）经历时域OCT、频域OCT等技术演进后推出的OCT血管成像（OCTA）技术是视网膜影像检查技术发展的里程碑。OCTA无需注射造影剂，通过更快的扫描速度，更密集的扫描模式对同一位置进行多次扫描，提取变化的OCT信号，以不同算法去除伪迹并转换成血流，安全快速地得到视网膜脉络膜微血管的三维成像；对黄斑区血管病变等视网膜脉络病疾病有不同于传统血管造影的诊断评估优势。充分认识OCTA的技术特色，不断提升其临床应用水平，将为眼底疾病临床诊疗提供更多病理生理特征信息，有助于加深对眼底疾病发病机制的认识，为眼底疾病检查诊疗模式改进带来划时代变化。

Optic coherence tomography （OCT） is one of the most rapid developing technologies in ophthalmology. OCT angiography （OCTA） has been made possible by the development of even faster scanning and sampling techniques, which is the next milestone after stratus OCT and spectral domain OCT. Without the need of injection of the contrast agent, OCTA is capable of providing a three-dimensional reconstruction of the perfused microvasculature within the retina and choroid by detecting the motion of scattering particles such as erythrocytes within sequential OCT cross-sectional scans performed repeatedly at the same location of the eye with different analysis algorithms. Comparing to fundus fluorescein angiography and indocyanine green angiography, with improved OCT technology and understanding, OCTA has showed certain advantages to diagnose retinal and choroidal diseases, especially macular vascular diseases. It is important to establish the contributions that OCTA can make to diagnosing, managing and understanding of ocular fundus diseases.