When your doctor tells you they're ordering an MRI, one of the first questions that comes to mind is how long you'll actually be inside that machine. The answer varies more than you might expect — and it matters because knowing the duration upfront helps you prepare mentally, arrange your schedule, and decide whether you need to discuss sedation options with your doctor before the appointment.
Plenty of patients go in expecting 15 minutes and find out the scan is 45 minutes long, or cancel a scan they were dreading only to learn it would have been over in 20 minutes. Getting accurate information about your specific scan type eliminates that uncertainty.
A standard MRI scan takes between 15 and 90 minutes, with most scans falling in the 30- to 60-minute range. The exact duration depends on which body part is being scanned, whether contrast dye is used, how many sequences (image sets) the radiologist needs, and whether you're able to stay still throughout the scan. Moving during a sequence means that sequence has to be repeated, which adds time — sometimes significantly.
If you're about to have your first MRI, the time question is probably what concerns you most. Lying still inside a narrow tube while the machine makes loud knocking and buzzing sounds isn't anyone's idea of a good time, and knowing what to expect makes the experience considerably less stressful. A knee MRI might be done in 20 minutes.
A brain MRI with and without contrast could take 45 minutes. A full-body MRI can run 90 minutes or longer. The variation is wide, and your doctor's office should give you an estimated scan time when scheduling, but this guide breaks down typical times by body part so you know what's realistic.
It's worth noting that total appointment time is longer than scan time. You'll arrive early for check-in and screening, change into a gown, have an IV placed if contrast is needed, be positioned on the MRI table, and then have the actual scan. After the scan, there's usually a brief observation period if contrast was administered. Plan to be at the imaging centre for 1–2 hours total even if the scan itself is only 30 minutes. Ask the facility for their specific guidance when you schedule the appointment.
This guide covers scan durations for the most common MRI types, what factors make scans longer or shorter, what happens during the scan, and tips for getting through the experience comfortably — especially if you're claustrophobic or anxious about the procedure.
You arrive at the imaging centre and complete paperwork including a safety screening questionnaire. The technologist reviews your medical history and confirms you have no metal implants, pacemakers, or other contraindications for MRI. You'll be asked about previous surgeries, metallic foreign bodies, tattoos, and pregnancy. You change into a hospital gown and remove all jewellery, watches, hair clips, and any clothing with metal fasteners. Personal items including your phone, wallet, and keys are stored in a locker outside the MRI room.
If your scan requires gadolinium contrast dye, a technologist or nurse inserts an intravenous (IV) line in your arm or hand before you enter the scan room. The contrast isn't injected until partway through the scan — the first set of images is taken without contrast, then the contrast is administered through the IV while you remain on the table, and a second set of images is taken after contrast to show how tissues enhance. The IV stays in place until the scan is complete.
The technologist positions you on the MRI table, typically lying on your back. Depending on the body part being scanned, a coil (a specialised antenna device) is placed over or around the area of interest — for example, a head coil for brain MRI, a knee coil for knee MRI. You're given earplugs or headphones to reduce the noise from the machine. The technologist explains how long the scan will take, gives you a squeeze-ball panic button you can press to stop the scan at any time, and slides the table into the MRI bore (the cylindrical opening).
The MRI machine runs a series of sequences — each lasting 2–8 minutes — during which the machine makes loud banging, clicking, and buzzing sounds. You must stay completely still during each sequence. Between sequences there are brief pauses of 10–30 seconds where you can adjust slightly if needed. The technologist communicates with you through an intercom between sequences and can see you through a window at all times. If contrast is being used, the technologist enters the room midway through the scan to administer the contrast through the IV.
When the scan is complete, the table slides out and the technologist removes the coil and IV (if applicable). If contrast was administered, you may be observed briefly for any adverse reactions (rare — mild nausea or headache occasionally occurs). You change back into your clothes and can resume normal activities immediately. Results are typically reviewed by a radiologist within 24–72 hours and sent to your ordering physician, who contacts you to discuss the findings.
The body part being scanned is the biggest factor in how long your MRI takes. Different anatomical areas require different numbers of sequences, different coil setups, and different levels of image resolution — all of which affect total scan time.
Brain MRI is one of the most common scans and typically takes 20–45 minutes. A basic brain MRI without contrast (screening for headaches, dizziness, or neurological symptoms) is usually 20–30 minutes. Adding contrast for tumour evaluation or multiple sclerosis assessment extends the scan to 35–45 minutes because additional post-contrast sequences are needed to show how tissues take up the contrast agent.
Spine MRI scans take 30–45 minutes per region (cervical, thoracic, or lumbar). If your doctor orders MRI of two spine regions — for example, cervical and lumbar — the total scan time is roughly double, since each region requires its own set of sequences and its own coil positioning. Spine MRIs are commonly ordered for disc herniation, spinal stenosis, nerve compression, and spinal cord abnormalities.
Knee MRI is relatively quick — typically 20–35 minutes — because the knee is a small, well-defined area and the coil setup is straightforward. Knee MRIs are among the most common orthopaedic MRI scans, frequently ordered for meniscus tears, ligament injuries (ACL, MCL), and cartilage damage. The short scan time makes knee MRI one of the more tolerable scans for first-time patients.
Shoulder MRI takes 30–45 minutes and is ordered for rotator cuff tears, labral tears, impingement, and other shoulder pathology. Some shoulder MRIs use a contrast injection directly into the shoulder joint (MR arthrogram) rather than intravenous contrast, which adds time for the joint injection before the scan begins.
Abdomen and pelvis MRI takes 30–60 minutes and often involves contrast. These scans are used to evaluate liver lesions, kidney abnormalities, pancreatic pathology, reproductive organs, and other abdominal and pelvic conditions. Abdominal MRI may include breath-hold sequences where the technologist instructs you to hold your breath for 15–20 seconds during specific sequences to reduce motion artefacts from breathing.
Breast MRI takes 30–45 minutes and uses contrast in virtually all cases. You lie face down on a special table with openings for the breasts, which are positioned in dedicated coils. Breast MRI is used for screening high-risk patients, evaluating extent of known breast cancer, and assessing breast implant integrity. The prone position is different from other MRI scans and some patients find it less claustrophobic than lying on their back in the standard bore position.
Cardiac MRI is one of the longest common scans at 45–90 minutes. It uses ECG gating — synchronising the MRI sequences to your heart rhythm — which requires additional setup time and specialised sequences. Cardiac MRI evaluates heart structure, function, blood flow, and tissue characterisation (including scarring and inflammation). The length and complexity make cardiac MRI one of the most technically demanding MRI procedures.
Prostate MRI, ordered increasingly often as an alternative or complement to biopsy for prostate cancer evaluation, takes 30–45 minutes. It uses a multiparametric protocol (mpMRI) that acquires several types of image sequences to characterise prostate tissue in detail. The scan is performed without an endorectal coil at many centres now (using a 3T machine with surface coils instead), which makes the experience considerably more comfortable than it was when endorectal coils were standard.
Wrist and ankle MRI scans are among the shortest at 15–25 minutes, since these are small anatomical areas that require fewer sequences and straightforward coil positioning. If your MRI is for a hand, wrist, foot, or ankle injury, you can expect to be in and out relatively quickly compared to larger body-area scans.
For these extremity scans, some facilities have dedicated extremity MRI machines — smaller, open units that scan only the limb rather than the whole body, which eliminates claustrophobia entirely since your body doesn't enter an enclosed bore. Ask your ordering physician whether a dedicated extremity MRI unit is available and appropriate for your specific diagnostic scan.
If your scan requires contrast, expect 15–30 minutes of additional time. The IV placement takes 5–10 minutes, and additional post-contrast sequences add another 10–20 minutes of scan time. Your doctor orders contrast when they need to see how blood vessels, tumours, inflammation, or infections enhance — which means the additional time is diagnostically necessary. Not all MRIs require contrast — your ordering physician determines this based on what they're looking for.
Moving during a sequence creates motion artefacts — blurry or distorted images that can't be used diagnostically. When this happens, the technologist has to repeat the affected sequence, adding time to the scan. Even small movements (swallowing, coughing, shifting position) can degrade image quality. Staying as still as possible is the most important thing you can do to keep scan time short. If you know you'll have difficulty staying still, discuss sedation options with your doctor before the appointment.
An MRI scan consists of multiple sequences, each producing images with different tissue contrast (T1-weighted, T2-weighted, FLAIR, diffusion-weighted, etc.). A basic screening scan may require 4–6 sequences. A detailed diagnostic scan investigating a specific pathology may require 8–12+ sequences, each adding 2–8 minutes. The radiologist or ordering physician determines how many sequences are needed based on the clinical question being addressed.
MRI machines vary in magnetic field strength — commonly 1.5 Tesla (1.5T) and 3 Tesla (3T). Higher field strength (3T) produces higher-resolution images but doesn't necessarily reduce scan time — in some cases 3T scans take longer because more detailed sequences are acquired. Open MRI machines (designed for claustrophobic or larger patients) use lower field strength and typically produce lower-resolution images, which may require longer sequences to compensate. The machine available at your imaging centre affects both image quality and scan duration.
Claustrophobia and general anxiety are the most common reasons patients struggle with MRI scans. Several strategies can help:
If claustrophobia is a significant concern, ask your doctor about open MRI as an alternative to the standard closed-bore machine.
Preparation for an MRI is straightforward — there's no fasting required for most scans (except some abdominal MRIs where your doctor may ask you not to eat for 4–6 hours before), and no dietary restrictions apply. The main preparation is practical: wearing comfortable clothing without metal (or being prepared to change into a gown), removing all jewellery and accessories, and arriving with enough time for check-in and screening.
Bring your photo ID, your insurance card, and the MRI order from your doctor. If you have any previous imaging (CT scans, X-rays, prior MRIs on disc or through a patient portal), bringing or uploading these for comparison can help the radiologist interpret your new scan. Let the scheduling staff know if you have claustrophobia so they can schedule extra time for the appointment and arrange sedation if needed.
If you have any metal implants — joint replacements, spinal hardware, cardiac stents, dental implants — tell the MRI team during screening. Most modern orthopaedic implants are MRI-compatible, but the technologist needs to verify compatibility before proceeding. Pacemakers and certain other electronic implants may be contraindicated for MRI, though many modern pacemakers are designed to be MRI-conditional under specific protocols. Bring documentation of your implant (the implant card from your surgeon) if you have one.
For contrast-enhanced MRIs, let the team know if you have kidney problems — gadolinium contrast is processed by the kidneys, and impaired kidney function increases the risk of a rare but serious side effect called nephrogenic systemic fibrosis. A blood test to check kidney function may be required before contrast administration if your medical history suggests risk. Also mention any previous allergic reactions to MRI contrast, which are uncommon but can occur.
After your MRI scan, the images are reviewed by a radiologist — a physician specialising in medical imaging interpretation. The radiologist produces a report describing the findings, which is sent to your ordering physician (the doctor who requested the MRI). Turnaround time for results varies: routine outpatient MRIs are typically reported within 24–72 hours, while urgent scans ordered from the emergency department may be read within hours.
Your ordering physician — not the MRI technologist — is the appropriate person to discuss results with. The technologist who performed the scan cannot provide diagnostic information or discuss findings, even if you ask during the scan. This can feel frustrating when you're anxious about results, but the technologist's role is to acquire quality images, and interpretation requires the radiologist's specialised training and access to your full medical history.
Some imaging centres offer patient portal access where you can view the radiologist's report and even the MRI images themselves. While reading your own report can be informative, radiology reports use technical language (describing signal characteristics, anatomical locations, and comparison to normal) that can be confusing or alarming without clinical context. A finding described as 'nonspecific signal abnormality' might sound serious but could be entirely benign — or it could warrant further investigation. Your ordering physician interprets the report in the context of your symptoms, medical history, and physical examination to determine what the findings mean for you specifically.
MRI costs vary dramatically depending on where you have the scan, what's being scanned, whether contrast is used, and your insurance coverage. Without insurance, MRI scans can range from $400 to $3,500 or more. With insurance, your out-of-pocket cost depends on your plan's deductible, copayment structure, and whether the facility is in-network.
Freestanding imaging centres (not attached to a hospital) are typically 40–60% cheaper than hospital-based MRI facilities for the same scan — because hospital-based facilities include facility fees that freestanding centres don't charge. If you have a choice of where to get your MRI and cost is a concern, ask your doctor if a freestanding centre is appropriate for your scan. Most routine outpatient MRIs can be performed at freestanding centres with equivalent image quality.
Prior authorisation from your insurance company is commonly required before an MRI scan. Your doctor's office typically handles this process, but it can take 1–5 business days for approval. If your MRI is urgent, your doctor can request expedited authorisation. If authorisation is denied, your doctor can appeal with additional clinical justification. Don't schedule the MRI until authorisation is confirmed — having a scan without authorisation can result in the full cost being your responsibility.
If you're uninsured or have a high-deductible plan, ask the imaging centre about cash-pay pricing before scheduling. Many centres offer significant discounts for cash payment at the time of service — sometimes 50% or more below the billed insurance rate. Shopping around between facilities is legitimate and encouraged: the same MRI scan can cost $500 at one centre and $3,000 at another in the same city. Websites like Healthcare Bluebook and MDsave provide pricing transparency tools that show typical costs for MRI scans in your area.
MRI is a safe procedure with essentially no recovery time — you can drive, eat, drink, and resume normal activities immediately after the scan (unless you received sedation, in which case you shouldn't drive until the medication wears off). There's no residual effect from the magnetic field or radio waves used during the scan.
Some patients report mild muscle stiffness or back discomfort from lying still on the MRI table for an extended period — particularly for longer scans like cardiac or full-body MRI. This resolves quickly once you're able to move and stretch after the scan. If you have pre-existing back problems, let the technologist know before the scan starts — they can provide additional padding, a knee bolster to reduce lower back strain, or position you more comfortably.
If gadolinium contrast was administered, mild side effects are possible but uncommon: headache, nausea, and a cool sensation at the IV site during injection are the most frequently reported. These typically resolve within minutes to hours. Serious allergic reactions to gadolinium are extremely rare (much rarer than reactions to CT contrast), but if you experience difficulty breathing, hives, swelling of the face or throat, or severe nausea after leaving the imaging centre, seek medical attention immediately.
The most common post-MRI anxiety is waiting for results. As mentioned, routine results take 24–72 hours. If you haven't heard from your doctor within a week, call the office to follow up — sometimes reports are received but not reviewed promptly, and a polite call ensures your results don't get overlooked. If the MRI was ordered urgently (for example, from the emergency department), results are typically communicated much faster — often the same day.