![]() See the detailed images they were able to capture in just 2.8 seconds. Kostadinka Bizheva at the University of Waterloo as a future method to advance disease diagnosis & treatment. Ultra hi-resolution SD-OCT imaging of the cornea is being explored by Dr. Examining the posterior region is relevant in the diagnostic of age-related macular degeneration (AMD) which is a leading cause of vision loss in elderly people. By means of spectral-domain optical coherence tomography, high resolution details of the retina may also be obtained with 800 nm wavelength, while a wavelength of 1050 nm is suitable for examinations of the optic nerve. The main parts of the posterior segment are the retina, macula, and optic nerve. Examination of the anterior segment is crucial for treatments of diseases such as glaucoma and cataracts. For example, the cornea, part of the anterior segment, is examined with 800 nm wavelength in proximity to the surface while 1300 nm wavelength is suitable for deeper anterior structures such as the lens. Imaging these two segments with spectral-domain optical coherence tomography requires different wavelengths in the infrared region to probe the eye perfectly. Ophthalmologists commonly divide the eye into two parts: the front of the eye, known as the anterior segment, and the area behind the lens, the posterior segment. It is perhaps the easiest medical imaging test that a patient can take and it only lasts about 5 minutes. Key advantages of SD-OCT include the non-contact and non-destructive approach to observing the eye, a very high imaging resolution, and its ability to be performed quickly, without any special patient prep. Spectral-domain optical coherence tomography, often abbreviated to SD-OCT, therefore provides a unique method for ophthalmologists to observe retinal structure that is key to the diagnosis of injury and disease during eye examinations. The eye is a very sensitive and complex organ that consists of several different intricate structures. It gains its name from the spectra of back-scattered light that are collected from different depths within a sample to generate the OCT image. Spectral-domain optical coherence tomography is a subset of OCT technology that combines a light source with broad optical bandwidth and a high sensitivity spectrometer with high signal-to-noise-ratio for detection. This imaging technique uses infrared light to probe the eye and creates a 3D image from a series of cross sections on a very short time scale. Optical coherence tomography, or OCT, is the method of choice for ophthalmologists looking to examine the back of the eye, known as the retina, where standard techniques reach their limits. It enables ophthalmologists to image actual living tissue deep in the human eye at microscopic resolution and thus provides the basis for treatments of eye diseases. Ophthalmic imaging is an integral part of diagnostic procedures evaluating eye conditions. ![]()
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