DyeAngiographie

Dye angiography is a medical imaging technique that uses intravenous or intra-arterial administration of a dye or contrast agent to visualize blood vessels. Depending on the modality, different dyes and imaging methods are used to depict arterial and venous structures.

In radiology and interventional procedures, iodinated contrast agents are injected and images are acquired with X-ray fluoroscopy, enabling angiography and digital subtraction techniques. CT angiography and MR angiography use CT or MRI scanners with iodinated or gadolinium-based contrast to create three-dimensional maps of the vasculature.

In ophthalmology, fluorescein angiography or indocyanine green angiography involve injecting a fluorescent dye and capturing sequential photographs of the retina to assess circulation, detect leaks, neovascularization, or capillary nonperfusion.

Procedure overview: access is gained via femoral, radial, or peripheral vessels, followed by sterile injection of dye under imaging guidance. Real-time imaging may be performed with fluoroscopy or CT/MR sequences, and, in eye imaging, specialized cameras capture dye transit through retinal vessels.

Indications include diagnosis and evaluation of vascular diseases such as arterial occlusions, stenosis, aneurysms, and arteriovenous malformations; assessment before endovascular treatment; and monitoring organ perfusion. In ophthalmology, dye angiography helps diagnose diabetic retinopathy, age-related macular degeneration, vein occlusions, and other retinal vascular disorders.

Risks and limitations encompass possible allergic reactions to contrast, kidney injury from iodinated agents, radiation exposure for X-ray–based studies, and injection-site or vasovagal complications. Contraindications include severe contrast allergy and significant renal impairment.