At a glance
MRI (Magnetic Resonance Imaging) is a scan that uses a strong magnetic field and radio waves to produce detailed images of the inside of your body, without using radiation.
During the scan, the magnetic field causes hydrogen atoms in your body's water and fat to line up. Radio waves then briefly disturb that alignment, and the machine detects the signals the atoms release as they settle back. A computer translates those signals into cross-sectional images, which a radiologist (a doctor who specialises in reading medical images) then interprets. Different tissues, such as muscle, fluid, and bone marrow, produce distinct signals, which is why MRI can reveal soft-tissue detail that X-ray or CT often cannot.
Medical Condition
Doctors request an MRI when they need a clear picture of soft tissue, organs, or the nervous system that other imaging cannot provide well enough.
- Brain and spinal cord problems: tumours, stroke, multiple sclerosis (a disease where the immune system attacks nerve coverings), and spinal disc injuries.
- Joint and musculoskeletal conditions: torn ligaments, cartilage damage, tendon injuries, and bone marrow abnormalities.
- Heart and blood vessels: structural heart defects, aortic (main artery) disease, and vascular (blood vessel) malformations.
- Abdominal and pelvic organs: liver disease, kidney tumours, prostate conditions, uterine fibroids (non-cancerous growths in the womb), and ovarian cysts.
- Cancer staging and treatment monitoring: checking how a tumour has responded to treatment.
- Unexplained symptoms such as persistent headaches, vision changes, or weakness in a limb when a cause has not been found.
MRI is not suitable for everyone. People with certain implanted metal devices may not be able to have the scan safely. Your doctor will review your medical history before proceeding.
- Some cardiac pacemakers and implantable defibrillators (devices that control heart rhythm).
- Certain cochlear implants (electronic hearing devices placed in the ear).
- Metal fragments or shrapnel in or near the eyes.
- Some older aneurysm clips (surgical clips placed on blood vessels in the brain).
- Severe claustrophobia (fear of enclosed spaces) that cannot be managed, though open MRI or sedation are sometimes options.
Risks & Complications
A standard MRI carries very little risk for most patients, because it does not use ionising radiation (the kind used in X-rays).
- Anxiety or discomfort from lying inside a narrow, noisy tube for an extended period.
- Allergic reaction to gadolinium contrast dye (a liquid sometimes injected to highlight certain structures), ranging from mild skin flushing to, rarely, a more serious response.
- Nephrogenic systemic fibrosis (a rare condition affecting skin and organs), a risk linked to gadolinium contrast in people with severely reduced kidney function.
- Heating or movement of implanted metal devices if the radiographer is not informed about them before the scan.
- Acoustic discomfort from the loud knocking sounds the machine produces, though earplugs or headphones are usually provided.
- In patients who need sedation, the usual risks associated with sedative medication apply.
Preparation & Procedure
Preparation for an MRI is straightforward, but some steps depend on which part of the body is being scanned and whether contrast dye will be used.
If contrast dye will be injected, most facilities ask you to stop eating and drinking for at least four to six hours before the appointment. For scans without contrast, fasting is usually not required, though some centres ask you to avoid large meals. Your doctor will give you specific instructions.
Tell the radiology team about any metal implants, tattoos with metallic ink, patches on your skin, or dental work before you arrive. Blood-thinning medications and medications that affect the kidneys may need to be reviewed if contrast dye is planned. Bring a list of all your current medications to the appointment.
A kidney function blood test is sometimes ordered before contrast MRI to check whether gadolinium can be used safely. If you have known kidney problems, inform the team in advance.
On the day of the scan, the steps typically unfold as follows.
- You change into a hospital gown and remove all metal objects, including jewellery, hairpins, hearing aids, and glasses.
- A radiographer (the technician who operates the scanner) reviews a safety checklist with you and confirms you have no contraindications.
- If contrast dye is being used, a small cannula (thin plastic tube) is placed in a vein in your arm.
- You lie on a motorised table that slides into the MRI machine. Positioning aids or coils (specialised antennas placed near the body part being scanned) may be placed around you.
- You are given earplugs or headphones to reduce the noise from the machine.
- The table moves into the scanner and the scan begins. You must lie still; movement blurs the images.
- The radiographer monitors you from an adjacent room and can communicate with you at any time through an intercom. You are usually given a call button to press if you feel unwell.
- When all the required sequences are complete, the table moves back out. The cannula is removed if one was placed.
- A radiologist analyses the images and sends a report to your referring doctor, usually within one to a few days depending on the facility.
Aftercare
Most people can resume normal activities immediately after an MRI, because the scan itself does not alter the body in any physical way.
- If no sedation or contrast dye was used, you can eat, drink, and drive as normal right after the scan.
- If you were sedated, you will need to rest in the facility until the medication wears off and should arrange for someone to take you home. Driving is not permitted for the rest of that day.
- If contrast dye was injected, drinking plenty of water in the hours after the scan helps your kidneys clear the dye from your body.
- Watch for any delayed allergic reaction to contrast dye, such as hives (raised, itchy welts on the skin), difficulty breathing, or swelling of the face. Seek medical attention promptly if these occur.
- Your referring doctor will discuss the scan results with you at a follow-up appointment. Ask your doctor's office how and when you will receive the report so you are not left waiting without information.
- No wound care or physical restrictions are needed after a routine MRI.
Cost & What Determines It
The cost of an MRI varies widely depending on factors that go beyond the scan itself, including where it is performed, what body part is examined, and the technical specifications of the machine used.
- Body region scanned: a scan of the brain differs in complexity and time from a scan of the abdomen or multiple body parts in one session.
- Whether contrast dye (gadolinium) is used, as this adds both material cost and clinical monitoring time.
- Field strength of the MRI machine: a 3 Tesla (high-strength) scanner generally costs more to operate than a 1.5 Tesla unit, and may be recommended for specific diagnostic needs.
- Hospital class and country: a private hospital in a major city, especially in a medical tourism destination, will typically price differently from a public or regional facility.
- Radiologist's reading and reporting fee, which may or may not be bundled with the scan price.
- Any additional sequences or specialised protocols requested by the referring doctor.
- Sedation or anaesthesia, if required, which adds both a medication cost and the fee of the anaesthetist.
A hospital package for MRI often includes the scan itself, the radiologist's written report, and use of the changing area. Items commonly billed separately include the specialist consultation to review results, blood tests ordered alongside the scan, contrast dye, and sedation if needed.
BPJS Kesehatan and most Indonesian private insurance policies do not cover medical procedures performed abroad, so patients who travel for an MRI typically pay out of pocket or through an international health insurance plan that explicitly covers overseas treatment. Before travelling, request a written cost estimate from the hospital that itemises every component, including the scan fee, contrast charges, and reporting fee. This protects you from unexpected charges on arrival.
Frequently Asked Questions
Does an MRI hurt?
An MRI scan does not hurt. The machine creates detailed images using a magnetic field and radio waves, so there is no needle, no cut, and no radiation involved. You will hear loud knocking or buzzing sounds during the scan, and the technologist will usually offer you earplugs or headphones to make it more comfortable.
How do I prepare for an MRI? Do I need to fast?
For most MRI scans you can eat and drink normally beforehand, though your doctor may ask you to fast for a few hours if your scan involves the abdomen or requires a contrast dye injected into a vein. You will need to remove all metal objects such as jewellery, glasses, and hearing aids before entering the scanner room. Always tell the team if you have any metal implants, a pacemaker, or if you might be pregnant.
How long does an MRI take?
Most MRI scans take between 20 and 60 minutes, depending on which part of the body is being scanned and how many sequences the radiologist needs. Scans of a single joint tend to be shorter, while brain or spine scans with contrast can take longer. Staying as still as possible helps the process go faster and produces clearer images.
How much does an MRI cost?
The cost of an MRI depends on the part of the body being scanned, whether a contrast agent is used, and the class of hospital or imaging centre you choose. A scan covering multiple areas or requiring special sequences will generally cost more than a straightforward single-region scan. Requesting a written cost estimate from the hospital before your appointment is the most reliable way to know what you will pay.
This page is general information, not a substitute for medical advice. Every case is different. Your doctor decides what is right for you.
