Cerebral CT angiography is an imaging exam that allows the blood vessels of the brain to be seen in great detail. It is a fast exam and very useful to investigate changes in cerebral circulation, helping the doctor make safer decisions – both in an emergency setting (for example, stroke) and in scheduled assessments.
What is Cerebral CT Angiography and what is it for?
Cerebral CT angiography is a CT scan with an angiographic protocol, focused on the intracranial vessels, performed with iodinated contrast administered intravenously.
The contrast “highlights” the arteries (and, in some protocols, also the veins), allowing the identification of changes that may not be visible on a standard CT scan.
This exam is particularly important to accurately assess the state of the arteries that supply the brain and to detect changes that may increase the risk of neurological complications.
What is the price of Cerebral CT Angiography?
The private price of Cerebral CT angiography is €270.
However, you may have Cerebral CT angiography through several agreements, including:
- SNS / ARS: When Cerebral CT angiography is performed through the SNS, the patient does not pay any amount (you must bring the prescription from the Health Centre);
- ADSE: If Cerebral CT angiography is performed through ADSE, the patient pays the fee of €25;
- IASFA, ADM GNR, SAD PSP;
- Insurance providers: Médis, Multicare, Advance Care, Allianz, Saúde Prime, Future HealthCare, SS CGD, SAMS Quadros, SAMS, Montepio, RNA, Generali, Mudum, MGEN, Aegon, Vitória, Una Seguros, other insurers. In this case, the price varies depending on the insurance you use;
- Health plans: Medicare, Saúde Prime, Future HealthCare, Continente Wells, ACP, other health plans. In this case, the price varies depending on the plan you use;
- Protocols: NRD has protocols with several clinics and institutions that allow you to have the exam at very competitive rates. For Cerebral CT angiography, the protocol price is €175.
How is it performed?
Cerebral CT angiography is performed with the patient lying on a table (bed) that slides into the scanner. Iodinated contrast is administered intravenously and sequential images are then acquired while the contrast travels through the circulation. On average, the exam takes between 10 and 20 minutes.
NRD has a latest-generation Philips 128-slice scanner, which provides sharp images with a low radiation dose, ensuring safety and effectiveness in every exam.
What does it detect?
Cerebral CT angiography can detect various changes in the cerebral vascular system, such as:
- Cerebral aneurysms;
- Stenoses (narrowing) of intracranial arteries;
- Arterial occlusions (blockages);
- Arteriovenous malformations and other vascular abnormalities;
- Arterial dissections (in specific contexts);
- Relevant vascular changes in the study of stroke / TIA (according to the clinical indication);
- Assessment / follow-up in some cases after treatment (for example, stents), when indicated.
In which cases is it indicated?
Cerebral CT angiography is generally requested by the doctor in situations such as:
- Suspected aneurysm or aneurysm assessment;
- Investigation of changes in cerebral circulation and stroke risk;
- Assessment of acute stroke (as part of specific protocols, according to clinical decision);
- Study of vascular malformations;
- Planning and follow-up of neurosurgical or endovascular treatment;
- Clarification of some cases of sudden/intense headache when there is clinical suspicion of a vascular cause.
Cerebral CT Angiography with Contrast
As a rule, Cerebral CT angiography is performed with intravenous iodinated contrast. For the exam, a 4-hour fast is usually required (confirmed at the time of booking).
The contrast injection may cause a temporary warm sensation.
Although rare, allergic reactions to contrast can occur. To help prevent complications, it is essential to inform the team if you have known allergies (to medicines, foods, etc.), asthma, allergic rhinitis, or previous reactions to contrast agents. These types of allergies or other allergic conditions may increase the risk of contrast reactions.
Preparation for Cerebral CT Angiography
| Topic | Guidance |
| Exam prescription (paper copy) | You must bring the exam prescription in paper format. |
| Fasting | If the exam will be performed with contrast, you should fast for 4 hours. If the exam is performed without contrast, fasting is not necessary. |
| Arriving early | Generally, you only need to arrive 15 minutes before the exam, except in cases where oral contrast will be used. In this case, you should arrive 1 to 2 hours before the exam (you will be informed at the time of booking). |
| Previous exams | Bring any relevant previous exams. |
| Previous medical history | Be aware of your previous medical history regarding allergies, cardio-respiratory and kidney diseases, and your usual medication. |
| Water | If needed or if you wish, you may drink water. |
NRD will provide you with all instructions at the time of booking.
Instructions during the exam
To ensure the best image quality and that the exam is completed quickly, it is important to:
- Remain still during image acquisition;
- Follow breathing instructions (you may be asked to hold your breath for a few seconds);
- Remove metal objects that may interfere with the exam (for example, jewellery, glasses, hearing aids and dentures, when applicable).
When and how do you receive the results?
You will receive the CT results within up to 7 days after the exam, by email or on paper at the clinic. On the day of the exam, you will take the CD with the images with you.
Where to have it done?
Cerebral CT angiography can be performed at NRD, at the following address:
Avenida Columbano Bordalo Pinheiro, nº 11-B, ground floor, 1070–060 Lisbon (near Praça de Espanha)