What they are used for
- narrowing (stenosis) of the carotid and vertebral arteries, often following a carotid Doppler ultrasound;
- stenosis and occlusion of the intracranial arteries, after a stroke or TIA;
- brain aneurysms, both for diagnosis and for follow-up;
- dissections of the neck arteries;
- arteriovenous malformations and other vascular anomalies;
- cerebral venous thrombosis (venous study).
MR angiography
It is performed with the MRI scanner and uses no radiation. The intracranial arteries can be studied even without contrast; for the neck vessels a gadolinium-based contrast agent is often used. The same precautions as for MRI apply (pacemakers, implanted devices, claustrophobia, pregnancy).
CT angiography
It is performed with CT and requires an intravenous injection of iodinated contrast. It is very fast, provides detailed images and allows the vessels from the aortic arch up to the brain to be studied in a single acquisition; it is particularly useful in emergencies and when MRI cannot be performed. It involves a dose of radiation.
Preparation
For contrast-enhanced tests a recent kidney function test (creatinine) is usually required, and it is important to report any allergies, especially to previous contrast agents, and the use of drugs such as metformin. Instructions on fasting and preparation are given by the facility where the test is performed.
MR or CT angiography?
The choice depends on the clinical question, the urgency and the patient's characteristics. A combined neurological and neuroradiological assessment makes it possible to indicate the most appropriate test and to interpret it in light of the symptoms; a review of tests already performed is also possible.
Where
Assessments and consultations in Milan, Osio Sotto (Bergamo) and Pistoia. To find out where the test is available and to book, see MioDottore or write to studio@drbonacchi.it.
The information on this page is for general information only and does not replace a medical visit. For sudden or severe symptoms call 112 or go to the Emergency Department.