Magnetic Resonance Imaging (MRI) of the head is a powerful, non-invasive tool that allows doctors to see detailed images of your brain, blood vessels, eyes, inner ears, and other critical structures. If your physician has recommended a head MRI, it’s natural to have questions, especially about the duration of the scan and what the experience will be like. Knowing what to expect can ease anxiety and help you prepare effectively.
How Long Does a Head MRI Take?
A standard MRI of the head typically takes between 30 to 60 minutes. However, the exact time can vary based on several factors:
- Type of Scan: A basic scan might be quicker, while a more comprehensive study that requires multiple “sequences” or specialized views will take longer.
- Use of Contrast Dye: If your doctor needs enhanced images of blood vessels or to look for inflammation, tumors, or infection, a contrast agent (usually gadolinium) may be injected intravenously. Administering the dye and taking additional images can add 10-20 minutes to the procedure.
- Specific Area of Interest: A scan focused on the brain may differ in length from one targeting the pituitary gland, internal auditory canals (for hearing issues), or orbits (eyes).
- Patient Cooperation: Remaining completely still is crucial for clear images. Any movement can blur the pictures, potentially requiring retakes and extending the time.
- Technology: Newer, high-field MRI machines can sometimes acquire images faster than older models.
As a rule of thumb, plan for an appointment slot of about 1 to 1.5 hours. This includes time for check-in, changing clothes, a pre-scan discussion, the scan itself, and a brief wait afterward if contrast was used.
What to Expect: A Step-by-Step Guide
1. Before the Scan: Preparation
- Scheduling & Screening: When you book your appointment, you’ll be screened for any metal in your body (e.g., pacemakers, old aneurysm clips, cochlear implants, metal fragments), as the MRI uses a powerful magnet. Inform the staff if you are pregnant or think you might be.
- Clothing & Items: You will change into a hospital gown. You must remove all metal objects—jewelry, watches, hairpins, glasses, and dentures. Lockers are usually provided.
- Contrast Discussion: If your scan requires contrast, a technologist will explain the process and ask about kidney function or allergies.
- Ear Protection: You will be given earplugs or headphones. The MRI machine makes loud, repetitive knocking and humming noises, and protection is essential.
2. During the Scan: The Experience
- The Machine: You will lie on a narrow, padded table that slides into the MRI scanner, which is a large tube with a circular opening. A head coil—a cushioned device that helps capture detailed images—will be placed around your head.
- Position & Comfort: The technologist will ensure you are as comfortable as possible, providing blankets and possibly a cushion under your knees. They will emphasize the importance of staying still.
- Communication: You will be given a call button or squeeze ball to hold. You can communicate with the technologist at any time through an intercom. They will be watching you from the control room.
- The Noise: Once the scan begins, you will hear a series of loud sounds—thumping, buzzing, and knocking. This is normal. Many facilities offer music through headphones to help mask the noise.
- Sensation: The MRI itself is painless. You will not feel the magnetic field or radio waves. If contrast is used, you may feel a cool sensation and a metallic taste in your mouth briefly when it’s injected. Some people feel a slight warming in the head area during scanning, which is also normal.
- Staying Still: This is the most challenging part. Focus on taking slow, deep breaths. Some people find it helpful to close their eyes before entering the machine to avoid feeling closed in (claustrophobia).
3. After the Scan: Post-Procedure
- Once the images are approved by the technologist, the table will slide out. If an IV line was placed for contrast, it will be removed.
- You can change back into your clothes and resume your normal activities immediately, unless you were given a sedative (sometimes offered for severe anxiety), in which case you’ll need a ride home.
- A specially trained radiologist will analyze the images and send a detailed report to your referring doctor, who will discuss the results with you, usually within a few days to a week.
Tips for a Successful MRI
- Communicate Anxiety: If you are prone to claustrophobia or anxiety, tell your doctor beforehand. They may prescribe a mild sedative to help you relax.
- Ask About “Open” MRI: While traditional “closed” MRI provides the highest image quality, “open” MRI machines are less enclosed and may be an option for some patients, though they use a weaker magnet.
- Wear Comfortable Clothing: Even if you change into a gown, comfortable clothes make the process easier.
- Use Relaxation Techniques: Practice mindfulness, meditation, or simply keep your eyes closed throughout the procedure.
A head MRI is a routine and highly valuable diagnostic procedure. By understanding the timeline and process, you can approach your scan with confidence, knowing you are taking an important step in managing your health. Always follow the specific instructions given by your healthcare provider and the imaging center for the best experience.