Have you got the OCT image of the fundus, are you still worrying about how to interpret it？
Welcome to science time! This article will discuss optical coherence tomography (OCT), an advanced technology widely used in eye examination, and introduce the basic principles and sequence of OCT image reading to help people better understand this convenient and non-invasive ophthalmic examination tool. Have you got the OCT image of the fundus, are you still worrying about how to interpret it?
Looking at the complex structure of the retina, are you still wondering where to start?
OCT, or Optical coherence Tomography, is a technique that uses the principle of light reflection to make microscopic images. It has the advantages of non-invasive, simple, rapid and accurate, and has become an important tool for the study of various fundus diseases. The principle of OCT film reading is based on the difference in optical reflection between different microscopic tissues. When the light shines on the surface of the tissue, a part of the light will be reflected back, and the internal structure of the tissue can be analyzed by detecting the reflection. In OCT images, the level of reflectance can be represented by color or gray scale, forming a false color or gray scale map.
When reading OCT, the following principles should be followed:
1. Before analyzing the light reflection characteristics of the tissue, it is necessary to first determine the way (false color or gray scale) of the OCT film to indicate the level of reflection.
2. Perform OCT image analysis in a certain sequence to ensure that no important information is missed.
3. Through qualitative and quantitative analysis, find out the changes of morphological structure and explore the reasons for the changes.
4. Combined with the patient's chief complaint, medical history, fundus color ultrasound, angiography and other examinations, the correct diagnosis was obtained after comprehensive evaluation.
OCT image reading can be performed in the following steps: general outline → structure of retinal layers (see the figure below) → choroidal layer → measurement of relevant data, paying attention to the symmetry of both eyes → comprehensive analysis to give a diagnosis.
The qualitative analysis includes morphological observation of the changes in the overall contour and structure of the retina, as well as based on reflexes
Quantitative analysis mainly measures thickness, volume and area.
Through the introduction of this article, I believe that everyone has a deeper understanding of the magic of OCT, let us look forward to the future development of OCT technology in the field of ophthalmology! Also welcome to contact us, we are Zhiding Medical Technology Co., Ltd.
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