Functional magnetic resonance imaging, or functional MRI (fMRI) is a functional neuroimaging procedure using MRI technology. It measures brain activity by detecting changes associated with blood flow. This technique relies on the fact that cerebral blood flow and neuronal activation are coupled.

No specific preparation is required. 

Patients with pacemakers, aneurysm clips or ferromagnetic metallic objects must advise the MRI staff when making their booking. Stainless steel / titanium orthopaedic prostheses are, however, not a contra-indication. 

As you are placed in a tubular gantry, you may experience some claustrophobia. It is very important that you remain still and are comfortable in the scanner – and therefore intravenous sedation is sometimes required.

You will be required to lie on the MRI bed with your head placed in a brace-like support. The table will then move into a wide-bore tubular gantry, which is open at both ends. 

During the examination you will be in constant voice contact with the radiographer. The radiographer may ask you to hold your breath for certain sequences. 

If sedation is used, your pulse and oxygen saturation levels will be monitored with a pulse oximeter. This is a small clip attached to your finger. During the examination, a relatively loud knocking noise may be heard, but this is normal. You may experience vibrations during part of the studies. The examination is entirely painless and usually lasts between 15 and 30 minutes.

There are no post-procedure side effects and you may continue normal activity.