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Angiography

Angiography is a diagnostic method performed with X-rays to evaluate the health of blood vessels. It involves using a contrast agent, as the blood vessels are not visible during an X-ray. However, the blood vessels are visible during X-rays once the contrast agent is injected.


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  • Digital Subtraction Angiography: It is an imaging modality performed to obtain images for detecting brain blood flow-related diseases. Doctors, during this procedure, insert the catheter into the leg artery and guide it to the brain's blood vessels. A contrast agent is injected into the brain's blood vessels. The images are then obtained with X-rays. The technique is used for arterial balloon angioplasty, endovascular embolization, arterial stenting, endovascular aneurysm repair, and thrombectomy.
  • Conventional Angiography: Conventional angiography is performed similarly to digital subtraction angiography with few differences. In conventional angiography, the catheter used is relatively thicker, the dose of contrast agent is higher, and the procedure has relatively more complications than digital subtraction angiography. Further, in digital subtraction angiography, the quality of the images is superior to conventional angiography due to the electronic subtraction of the bone and other high-density structures that may interfere with vessel imaging.
  • CT Angiography: CT angiography involves using a computed tomography scan and a contrast agent to obtain images of tissues and blood vessels. It helps evaluate the blood vessels for blood clots, aneurysms, vessel rupture, cancer, vascular malformations, injuries to blood vessels, and congenital cardiovascular disorders.
  • MR Angiography: This imaging technique uses powerful magnets, radio waves, and display monitors to evaluate the health of blood vessels. Unlike conventional angiography and CT angiography, MR angiography does not use radiation. In addition, it has been reported that the contrast agent used in MR causes relatively fewer allergic reactions.
  • Venography: Venography is the imaging technique used to determine the health of veins, especially in the legs. The technique involves the use of a contrast agent. It allows doctors to detect the presence of blood clots in the veins.