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While conventional dye-based angiography is still the common gold standard, OCTA has been evaluated and used across many diseases. [4] [5] [25] OCTA was first introduced in clinical eyecare in 2014. [26] OCTA has applications in several diseases, including leading causes of blindness such as glaucoma [24] and age-related macular degeneration. [27]
The fluorescein is administered intravenously in intravenous fluorescein angiography (IVFA) and orally in oral fluorescein angiography (OFA). The test is a dye tracing method. The fluorescein dye also reappears in the patient urine, causing the urine to appear darker, and sometimes orange. [2] It can also cause discolouration of the saliva.
Angiography or arteriography is a medical imaging technique used to visualize the inside, or lumen, of blood vessels and organs of the body, with particular interest in the arteries, veins, and the heart chambers.
The diagnosis is mainly clinical, however fundus fluorescein angiography shows that the streaks appear hyperfluorescent (window defect) in the early phase. [1] Indocyanine green angiography can also be used for diagnosing angioid streaks and their associated ocular pathologies.
Angioscopy is a medical technique for visualizing the interior of blood vessels.In this technique, a flexible fibre bundle endoscope catheter is inserted directly into an artery.
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Indocyanine green angiography (ICGA) is a diagnostic procedure used to examine choroidal blood flow and associated pathology. Indocyanine green (ICG) is a water soluble cyanine dye which shows fluorescence in near-infrared (790–805 nm) range, with peak spectral absorption of 800-810 nm in blood.