What is NIR ICG?
What is NIR ICG?
The use of indocyanine green (ICG) together with light at wavelengths in the near infrared range (NIR) permits visualizing anatomic structures, for instance. KARL STORZ considers fluorescence technology a future standard imaging technique.
What is ICG dye used for?
Indocyanine green injection is a medical dye used in tests to help determine the cardiac (heart) output, liver function, and blood flow in the liver. It is also used to help certain parts of the eye to become more visible during medical procedures such as angiography.
Is ICG a dye?
ICG is a water-soluble tricarbocyanine dye that binds to albumin and distributes rapidly and uniformly in the blood after intravenous injection. ICG is exclusively cleared from the bloodstream by the liver in a similar manner to bilirubin and toxins, and then excreted unchanged into bile.
What are NIR dyes?
Fluorescent dyes based on small organic molecules that function in the near infra red (NIR) region are of great current interest in chemical biology. They allow for imaging with minimal autofluorescence from biological samples, reduced light scattering and high tissue penetration.
How does near-infrared fluorescence imaging work?
NIR fluorescence imaging and tomography involves administration of a fluorescent contrast agent that (i) can be excited at wavelengths of 780 nm or greater, and (ii) has a significant Stoke’s shift emitting fluorescence at wavelengths of 800 nm or greater.
How does indocyanine green work?
ICG is a tricarbocyanine dye which fluoresces, i.e. emits light, after excitation under near-infrared light at 806 nm light. ICG is highly soluble in water and binds to β-lipoproteins, particularly to albumin. Because of the high protein content of lymph, ICG accumulates in the lymphatic pathways and lymph nodes.
How long does ICG dye last?
Because of the plasma protein binding, ICG stays for up to 20 to 30 minutes in the vessels (intravasally). When the eye is examined, it thus stays for a long time in tissues with a higher blood flow, such as the choroid and the blood vessels of the retina.
Is indocyanine green a contrast?
Nanoparticles 100 nm in diameter containing indocyanine green (ICG) have been developed as a contrast agent for photoacoustic (PA) imaging based on (photonic explorers for biomedical use by biologically localized embedding PEBBLE) technology using organically modified silicate (ormosil) as a matrix.
What is the range of NIR dyes?
Near infrared dyes show light absorption in the near infrared area of 700-2000 nm. Their intense absorption normally originates from a charge transfer of an organic dye or metal complex.
What Colour is Cy5?
Cy5 dye is a traditional far-red–fluorescent label for protein and nucleic acid conjugates used for imaging, flow cytometry, and genomic applications.
What is fluorescence imaging used for?
Fluorescence imaging is one of the most widely used diagnostic techniques, which allows for visualization of biomolecule or imaging probe location, gene expression, and enzyme activity in living cells or tissues to study their biological functions.
What is near IR fluorescence?
Near-infrared (NIR) fluorescence is a light wavelength of 650–950 nm, and is generally preferred for in vivo fluorescence imaging because of its good tissue penetration and low autofluorescence from adjacent tissues.
How is ICG used in the NIR-II domain?
In vivo imaging further confirmed the utility of ICG as a fluorescent dye in the NIR-II domain, with the CNR values being ~2 times those in the NIR-I window. The availability of an FDA approved imaging agent could accelerate the clinical translation of NIR-II imaging technology.
What kind of fluorescence is used in NIR-II?
Fluorescence imaging in the second near-infrared window (NIR-II) holds promise for real-time deep tissue imaging. In this work, we investigated the NIR-II fluorescence properties of a liposomal formulation of indocyanine green (ICG), a FDA-approved dye that was recently shown to exhibit NIR-II fluor …
When was ICG dye first used in photography?
ICG dye was developed for near infra-red (NIR) photography by the Kodak research laboratories in 1955 and was approved for clinical use in 1959 by the FDA [13]. Following intravenous injection, ICG is rapidly bound to plasma proteins, especially lipoproteins, with minimal leakage into the interstitium.
How are green nanoparticles used in NIR II imaging?
NIR-II fluorescence imaging using indocyanine green nanoparticles Sci Rep. 2018 Sep 27;8(1):14455.doi: 10.1038/s41598-018-32754-y. Authors