Children and MRI Scans: A Parent's Guide

If your child needs an MRI scan, it's completely natural to feel anxious — about the safety, the noise, whether they'll need to be sedated, and how to explain it all. The good news: MRI is one of the safest imaging methods available for children precisely because it uses no radiation. This guide covers everything parents need to know, from newborns to teenagers.

Is MRI Safe for Children?

Yes. MRI has been used safely in paediatric medicine for over 30 years.

• No radiation — Unlike X-rays and CT scans, MRI uses magnetic fields and radio waves. There is zero radiation exposure, making it ideal when imaging needs to be repeated over time (e.g., monitoring a condition).
• No known harmful effects — Extensive research has found no evidence that clinical MRI (1.5T or 3T) causes harm to developing tissues, the brain, or any organ in children of any age.
• Contrast (gadolinium) — When needed, gadolinium contrast is safe for children with normal kidney function. The dose is adjusted for body weight. The safety profile is the same as in adults.

Why Might a Child Need an MRI?

Paediatric MRI is used for a wide range of conditions:

• Brain and neurological — Headaches, seizures, developmental delay, suspected tumours, hydrocephalus, congenital brain anomalies
• Spine — Scoliosis assessment, tethered cord, spinal cord anomalies, back pain with nerve symptoms
• Musculoskeletal — Sports injuries (ligament and cartilage tears in adolescents), bone infections (osteomyelitis), bone tumours, hip conditions (Perthes disease, slipped upper femoral epiphysis)
• Abdomen and pelvis — Kidney abnormalities, liver lesions, pelvic masses, inflammatory bowel disease assessment
• Cardiac — Congenital heart disease evaluation, cardiomyopathy
• Monitoring — Follow-up imaging for known tumours, vascular malformations, or post-surgical assessment

Age-by-Age Guide

Babies and toddlers (0-3 years)

The main challenge is keeping the child still for 20-60 minutes. Babies and toddlers can't do this voluntarily, so options include:

• Feed-and-sleep technique — For babies under 6 months, the scan can sometimes be timed to coincide with a natural post-feed nap. The baby is swaddled, placed in the scanner during sleep, and scanned while sleeping. Success rates vary, but when it works, it avoids sedation entirely.
• Sedation — Oral or intravenous sedation administered by a paediatric anaesthetist or trained paediatrician. The child sleeps through the scan. Commonly used agents include chloral hydrate (oral) and midazolam (IV).
• General anaesthesia (GA) — For very young or uncooperative children, or when the scan is complex and must be completed in one session. A paediatric anaesthetist is present throughout, monitoring breathing, heart rate, oxygen levels, and blood pressure continuously.

Pre-school children (3-5 years)

Some children in this age group can manage without sedation with careful preparation:

• Play therapy sessions using toy scanners or videos of the MRI machine
• Simple, honest explanations: "A big camera that takes pictures of the inside of your body. It makes funny noises but doesn't hurt at all."
• Practice lying still at home — use a timer, gradually increasing the duration
• Reward systems (stickers, choosing a treat afterwards)
• A parent staying in the scanning room (after being screened for metal), holding the child's hand or foot

If the child cannot stay still despite preparation, sedation or GA may be needed. There is no shame in this — it's about getting clear images, and some children simply aren't ready.

School-age children (6-12 years)

Most children in this age group can have an MRI without sedation if properly prepared. Effective approaches:

• Explain the noises — "It makes loud banging and buzzing sounds, like a robot talking. You'll wear headphones with music to make it quieter."
• Explain what "staying still" means — "Pretend you're a statue" or "Imagine you're sleeping but your eyes can be open or closed — just don't move your body."
• Emphasise no pain — "Nothing touches you. It's just like lying in a tunnel listening to music."
• Let them ask questions — Children manage better when they feel informed rather than surprised
• Offer choices — Let them choose the music, whether they want eyes open or closed, whether they want a parent in the room
• Practice at home — Lie still for 5 minutes, then 10, then 15. Use headphones with music. Make it a game.

Teenagers (13+ years)

Teenagers can generally be treated like adults. Provide honest, straightforward information. Address claustrophobia concerns directly — the same strategies work as for adults (closing eyes, music, breathing techniques, wide-bore scanners). Respect their autonomy and let them communicate with the radiographer directly.

Sedation and Anaesthesia: What Parents Should Know

Is sedation safe?

Paediatric sedation for MRI is a routine procedure performed thousands of times daily across UK hospitals. It carries a small but real risk — primarily related to breathing (respiratory depression, airway obstruction). This is why it's administered by trained specialists with continuous monitoring of oxygen levels, heart rate, and breathing.

Is general anaesthesia safe for children?

Modern paediatric anaesthesia is very safe. The risk of serious complications is extremely low. In 2016, the FDA issued a communication about potential effects of prolonged or repeated anaesthesia exposure on brain development in children under 3 — but this relates to lengthy surgical procedures (hours), not the short anaesthetics used for MRI scans (typically 30-60 minutes). A single brief anaesthetic for MRI is considered very low risk.

Recovery after sedation/GA

• After sedation: Your child will be monitored until fully awake (typically 30-60 minutes). They may be drowsy, irritable, or unsteady for several hours. Normal diet and activity can resume once fully alert.
• After GA: Extended recovery monitoring in a dedicated area (1-2 hours). Follow the anaesthetic team's specific instructions about eating, drinking, and activity. Your child may be sleepy for the rest of the day.

Preparing Your Child: Practical Checklist

Before the appointment

• Explain what will happen using age-appropriate language
• Watch child-friendly MRI videos together (many hospitals have these on YouTube)
• Practice lying still at home with headphones and music
• If your child has any metal implants, surgical hardware, or medical devices, locate documentation
• Dress them in comfortable clothing with no metal — tracksuit, pyjamas, t-shirt. No zips, buttons, or decorative metal.

Fasting instructions

• No sedation/GA: No fasting needed (unless it's an abdominal scan — check your instructions)
• Sedation: Typically no food for 4-6 hours before. Clear fluids (water, diluted squash) usually allowed up to 2 hours before.
• General anaesthesia: No food for 6 hours, clear fluids for 2 hours before. Breast milk for 4 hours before (for infants). Follow the specific instructions from the anaesthetic team.

What to bring

• A comfort item (soft toy, blanket — must be metal-free)
• A change of clothes (in case of accidents or vomiting post-sedation)
• Snacks and drinks (for after the scan)
• Entertainment for the waiting room (books, colouring, tablet)
• Your child's medication list and any relevant medical records

During the Scan: What Happens

• A parent can usually stay — One parent can remain in the scanning room after being screened for metal. You may be able to hold your child's hand or foot. Your presence makes an enormous difference to younger children.
• Ear protection is provided — Earplugs and/or child-sized headphones with music
• An alarm button — Either the parent or the child holds the button to stop the scan at any time
• The radiographer watches constantly — Through a window and via intercom, monitoring the child throughout

If your child becomes upset

The scanning team deals with this routinely. Options include pausing for a break, repositioning for comfort, trying different distraction strategies, or stopping and rescheduling with sedation. Nobody will be frustrated — getting a usable scan from a distressed child isn't possible anyway, so there's no pressure to push through.

After the Scan

• No sedation: Your child can eat, drink, and return to normal activities immediately. Go and get ice cream.
• After sedation: Monitor until fully awake. May need to rest for the remainder of the day. Watch for nausea or unsteadiness.
• After GA: Extended monitoring, then home with specific instructions. Rest for the day.
• Results: A consultant radiologist reviews the images and produces a report, typically within 7 working days for private scans.

Frequently Asked Questions

At what age can a child have an MRI without sedation?

There's no fixed age — it depends on the individual child. Some 4-year-olds manage well with preparation; some 7-year-olds need sedation. As a rough guide, most children aged 6+ can cooperate with good preparation. Children aged 3-5 are variable. Children under 3 almost always need sedation or the feed-and-sleep technique.

Will my child remember the MRI?

If done without sedation, yes — but prepared children usually remember it as "noisy but boring." If done under sedation or GA, they typically have no memory of the scan itself.

Can my child go to school the next day?

If no sedation was used, yes — there's no reason not to. After sedation or GA, most children are fine the next day, but follow the medical team's advice.

Is an MRI better than a CT for my child?

For most paediatric conditions, yes. MRI provides superior soft tissue detail and uses no radiation — both significant advantages in children. CT is faster (seconds vs minutes) and better for lung and acute bone injuries, so it's preferred in emergencies. The choice depends on the clinical question. See our MRI vs CT comparison.