1-3 Because it employs OCT imaging technology, vascular information can be viewed alongside or superimposed upon structural data. Optical coherence tomography angiography (OCT-A) is a noninvasive and dyeless imaging technology that provides volumetric, 3D maps of the retinal and choroidal vascular systems, as well as information on blood flow. In the last image, red represents retinal blood flow and green is choroidal flow. Differing reflectance patterns between scans represent red blood cell movement and blood flow. These images demonstrate the principle of motion contrast, during which the same location is imaged four consecutive times. A reduced ratio could indicate retinal venular dilation, arteriolar attenuation or both.įig. Examining the arteriolar-venular caliber ratio can assist in diagnosing vascular abnormalities and associated pathology. Changes in the shape, color and caliber of vessels can represent ocular manifestations of many systemic conditions. Studying these retinal vessels during clinical examination can give insight into a patient’s overall vascular health. The eye is unique in that it allows for direct, noninvasive visualization of the body’s microvasculature. However, the retinal venules and arterioles can provide vital diagnostic information. When performing fundus evaluations, you may be tempted to focus on the retina and optic nerve while overlooking the status of the retinal vessels. Part 4: Identify and Manage Retinal Vascular Tumors Part 2: Read the Retinal Vasculature Like a Pro Follow the links below to read the other installments of this miniseries:
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