What is OCT angiography used for?

Optical coherence tomography angiography (OCT-A) has emerged as a non-invasive technique for imaging the microvasculature of the retina and the choroid. The first clinical studies using this innovative technology were published in 2014 .

When was OCT angiography invented?

Since its invention in the early 1990s, optical coherence tomography (OCT)[1] has become one of the most important imaging modalities in ophthalmology. OCT is a noninvasive imaging technology based on low-coherence interferometry.

What is the difference between OCT and OCTA?

Because OCTA uses OCT technology, it is subject to the same rule: Anything that affects light (such as dry eye or cataract) will affect the image. The important difference between OCT and OCTA is: OCT images anatomical structure, OCTA images vascular structure.

How do you read OCTA?

When interpreting OCTA images, the easiest way to detect projection artifacts is to compare en face flow with the corresponding B-scan. On B-scan, projections artifacts appear as “tails” arising from overlying vessels and should not be interpreted as true flow (Fig. 1f).

What is cardiac OCT?

Optical coherence tomography (OCT) is an optical analog of intravascular ultrasound (IVUS) that can be used to examine the coronary arteries and has 10-fold higher resolution than IVUS.

What is OCT A imaging?

Optical coherence tomography angiography (OCT-A) is a noninvasive and dyeless imaging technology that provides volumetric, 3D maps of the retinal and choroidal vascular systems, as well as information on blood flow.

Is OCTA invasive?

OCTA is quick and non-invasive, and provides volumetric data with the clinical capability of specifically localizing and delineating pathology along with the ability to show both structural and blood flow information in tandem. Optic disc perfusion in glaucomatous eyes is notable as well on OCTA.

What layers are imaged on OCTA?

Averaged OCTA images were created. Based on clear decorrelation signals, four vascular slabs were segmented, comprising one each in the retinal nerve fiber layer (RNFL), ganglion cell layer (GCL), and top and bottom of the inner nuclear layer (INL).

What is OCTA scan?

Optical coherence tomography angiography (OCTA) is a new non-invasive imaging technique that employs motion contrast imaging to high-resolution volumetric blood flow information generating angiographic images in a matter of seconds.

Why do I need an OCT scan?

In particular, an OCT scan can help to detect eye conditions like glaucoma, age-related macular degeneration and diabetic retinopathy. Your optician may recommend that you attend an OCT scan even when your eyes are healthy in order to provide a baseline image.

What is cath lab OCT?

Optical coherence tomography (OCT) is a diagnostic procedure that is used during cardiac catheterization. Unlike ultrasound, which uses sound waves to produce an image of the blood vessels, OCT uses light.

What is chronic total occlusion procedure?

General description of procedure, equipment, technique A chronic total occlusion (CTO) is defined as the complete obstruction of a coronary artery, exhibiting TIMI 0 or TIMI 1 flow, with an occlusion duration of >3 months. The prevalence has been described as high as 30%, and 13% of cases exhibit more than one CTO.

What kind of AngioVue is used for OCT angiography?

The retina was scanned using a Zeiss Cirrus 5000 HD-OCT (Zeiss Meditec. Inc, Germany), an Angiovue, RTVue XR Avanti (Optovue, Inc), a Topcon DRI OCT Triton Swept source OCT and a prototype of Spectralis OCT2 (Heidelberg Engineering, Germany).

Which is the best Octa machine for angiography?

The Triton is the only SS-OCT added onto a multimodal platform, with the ability to take color fundus images, red-free, autofluorescence, and fluorescein angiography. It has the ability to register the OCTA images with color, FA and OCT images to allow true multimodal assessment of patients on one device.

How are Zeiss and OptoVue rated in OCT-angiography?

After the inter-grader reliability assessment, a consensus grading was performed and the modules were ranked based on their scoring. There was no significant difference in the vessel density among the modules (Zeiss 48.7±4%, Optovue 47.9±3%, Topcon 48.3±2%, Heidelberg 46.5±4%, p = 0.2).