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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.
Many studies have demonstrated that evaluation of the retinal microvascular changes using OCTA or other methods such as fluorescein angiography may reflect the systemic microvascular functions as in patients with coronary microvascular disease, cerebral small vessel diseases or systemic sclerosis (The potential of retinal microvascularopathy as ...
From a physics perspective, both dye-based methods utilize the phenomenon of fluorescence. For FA, this corresponds to an excitation wavelength of blue (around 470 nm) and an emission wavelength near yellow (520 nm). [49] For IGCA, the newer method, the excitation wavelength is between 750 and 800 nm while emission occurs above 800 nm. [50]
Optical coherence tomography (OCT) is a technology using near-infrared light to image the eye, in particular penetrate the retina to view the micro-structure behind the retinal surface. Ocular OCT angiography (OCTA) is a method leveraging OCT technology to assess the vascular health of the retina. [15]
Digital subtraction angiography (DSA) is a fluoroscopy technique used in interventional radiology to clearly visualize blood vessels in a bony or dense soft tissue environment. Images are produced using contrast medium by subtracting a "pre-contrast image" or mask from subsequent images, once the contrast medium has been introduced into a ...
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Microangiography (/ ˌ m aɪ k r oʊ ˌ æ n dʒ i ˈ ɒ ɡ r ə f i / MY-kroh-AN-jee-OG-rə-fee) [1] is a type of angiography that consists of the radiography of small blood or lymphatic vessels of an organ. While most other types of angiography cannot produce images of vessels smaller than 200 μm in diameter, microangiography does just that. [2]
Live election results and related data for Senate, House and governor's races Senate Outlook 2014 Forecasts for 2014’s Senate races, based on HuffPost Pollster’s poll-tracking model