「画像診断の進歩」「眼底画像診断の進歩」―光干渉断層計Ｏｐｔｉｃａｌ Ｃｏｈｅｒｅｎｃｅ Ｔｏｍｏｇｒａｐｈｙ：ＯＣＴ―

Abstract

We describe the recent use of Optical Coherence Tomography (OCT) for ocular fundus imaging diagnoses. OCT is a device for imaging the ocular fundus which previously could only be obtained non-invasively, as planar, sectional images similar to tissue slices observed under a light microscope. OCT is similar to ultrasonographic devices, except for the fact that low-interference waves at a near-infrared wavelength are used as to image the tissue, instead of ultrasound wave forms. Since its initial development, improvements, from the use of time domain OCT to spectral domain OCT, have now made it possible to obtain images more quickly and at a higher resolution. The latest Spectralis HRA+OCT is able to obtain OCT images, together with ocular fundus angiography images, which represent the standard approach for imaging diagnoses. OCT is useful for ascertaining and diagnosing the pathological conditions of ocular fundus diseases.