Optical Coherence Tomography OCT part1

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PROCEDURE OF OCT: • • • STEP-1: PATIENTS DATA •  Activation of instrument entering patients data • • STEP-2: PATIENTS PREPARATION: •  Pupil dilate with mydriatics (tropicamide) •  Asked to look into the internal fixation target light in the • ocular lens • • STEP-3: PROTOCOL FOR SCAN ACQUISITION: •  Selected as per the case requirements •  The scanning beam is placed on the target area and scans • are obtained • • STEP-4: PRODUCTION DISPLAY IMAGE: •  Several data points are integrated by the interferometer to • construct a tomogram of the target area •  The tomogram is displayed in either grey scale or false color • on a high-resolution computer screen • INTERPRETATION OF OCT: • • • VITREOUS: • Anterior to retina is non-reflecting is seen as a dark space • • VITREORETINAL INTERFACE: • Is well defined due to the contrast between the non-reflecting • vitreous backscattering retina • • RETINAL LAYER: • • o ANTERIOR BOUNDARY: • Formed by highly reflective RNFL is seen as red layer due to bright • backscattering • o POSTERIOR BOUNDARY: • Its also seen as red layer representing highly reflecting retinal • pigment Epithelium (RPE) choriocapillaries. • o OUTER SEGMENTS OF RETINAL PHOTO-RECEPTOR LAYER: • As minimally reflective are represented as dark layer just anterior to • RPE-choriocapillaries complex • o DIFFERENT LAYER OF RETINA: • Between the dark layer of photoreceptor red layer of RNFL are • seen an alternating layers of moderate and low reflectivity • • OCT ONH: • Optic disc has also been shown to demonstrate useful • discrimination between normal glaucomatous eyes. • • MACULAR OCT: • Has demonstrated clear visualization of macular hole, macular edema lesion associated with Age Related Macular Degeneration (ARMD). • RNFL ASSESSMENT WITH OCT: • • • Retinal nerve fiber layer (RNFL), is highly reflective and its thickness • increases from the macula to optic disc margin • • OCT-3 offers a variety of RNFL thickness measurement and analysis • protocol like: RNFL thickness scan, fast circular scan, concentric • three-ring protocol, RFNL map and proportional circles • • Circular scan of 1.34 mm radius on the Optic nerve hypoplasia has been • shown to exhibit maximum reproducibility foe RNFL measurement • • The mean RNFL thickness is calculated using age-adjusted RNFL • thickness protocol. • INDICATION OF OCT: • • A. RETINAL DISEASE: • • • PRE POST MACULAR HOLE SURGERY: • o Helps to determine presence grade of macular hole • o To determine whether anatomical closure has occurred or not • • MACULAR EDEMA: • o Detection monitoring edema during treatment • • SUB-RETINAL NEOVASCULAR MEMBRANE: • o To evaluate pre post treatment features • B. GLAUCOMA: • • o OCT scan patterns for the optic nerve head and peripapillary retinal • fiber layer • o Glaucoma follow-up to detect evidence of progresson • Optical Coherence Tomography - OCT | part-1: • Optical Coherence Tomography - OCT | ...

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