How long does a head MRI take?
An MRI is an imaging examination that produces very detailed cross-sectional pictures of the brain and the surrounding structures, all without using X-rays.
What happens during a head MRI?
During a head MRI, you lie on a table that slowly moves into the tube-shaped opening of the MRI machine. Inside, strong magnetic fields and radio waves are used to create detailed pictures of the inside of your head. It is important to stay as still as possible during the scan so that the images do not come out blurry. The machine itself makes loud knocking and humming noises, which is completely normal.
Sometimes you will also be given something called a contrast agent, which is injected into a vein. This helps to make certain structures or changes more visible. Whether this is needed is decided by the radiologist depending on what is being investigated.
How much time should you allow for a head MRI?
The actual scanning time inside the machine is usually between 15 and 30 minutes. In some cases it can be a little quicker, for example when only very specific areas need to be examined. If a contrast agent is used or special images are needed, the time can extend to up to 45 minutes.
Before the scan itself, there is a short conversation where any possible risks are discussed and questions are answered. After that comes getting changed (usually into a special gown with no metal parts) and getting settled on the table. After the scan, it also takes a few minutes before you can get changed again and have a follow-up chat about the results. Overall, you should allow around 45 to 60 minutes for your appointment, even though you will not be inside the machine for all of that time.
What affects how long the scan takes?
The exact length of the scan can be influenced by several factors. One factor is how many different image sequences need to be taken. The more questions that need to be answered, the more images are required and the longer it takes. How well you can keep still also plays a role, as staying calm and not moving helps to produce clear, sharp images.
If a contrast agent needs to be used, the process takes a little longer because a cannula has to be inserted into a vein and the agent has to be injected. For some people, getting settled or prepared takes a bit more time, for example if positioning aids are needed or if extra reassurance is required for those who feel anxious in enclosed spaces.
What else is useful to know?
During the scan, it is important to stay as relaxed as possible and not to move. The machine is noisy, but you will usually be given headphones or earplugs, and sometimes music is played. An intercom system keeps you in contact with the staff throughout the whole time, so you can let them know at any point if you are not feeling well.
Anyone who feels anxious in enclosed spaces can speak to the team beforehand. Sometimes small things help, such as a sleep mask, music, or a few calming words. In rare cases, a mild sedative may be offered to help ease any anxiety.
When will the results be ready?
The images are produced during the scan itself, but they still need to be reviewed by a radiologist. In many clinics, you will receive an initial impression or a written report shortly after the MRI. Sometimes it takes one to two days for the full report to be sent to your treating doctor.
In summary: how long does a head MRI take?
For the actual imaging inside the machine, you should expect 15 to 30 minutes. Including preparation, getting changed, and a follow-up conversation, the whole appointment usually takes between 45 and 60 minutes. This allows enough time to go through every step calmly and to get the most informative result possible.
