If you've got an MRI scheduled and you're wondering how to plan your day around it, you're not alone. "How long does an MRI take?" is one of the most common questions patients ask before stepping into that loud, narrow tube. The honest answer: it depends—but you'll typically spend anywhere from 15 minutes to well over an hour in the scanner, depending on what's being imaged and whether contrast dye is involved.
Most routine MRI scans fall in the 30–60 minute range. That said, a quick brain MRI for a concussion follow-up might wrap up in 20 minutes, while a full spinal series could keep you on that table for 90 minutes or more. Knowing what to expect takes a lot of the anxiety out of the experience—and MRI anxiety is real for a lot of people.
This guide breaks down scan times by body part, explains the key factors that stretch (or shrink) your appointment, and gives you practical tips so you go in prepared.
Different anatomical regions require different numbers of imaging sequences, which is the main reason scan durations vary so much. Here's a realistic breakdown based on standard clinical protocols:
The raw anatomy is just one part of the equation. Several other factors can add significant time to your scan—some within your control, some not.
Gadolinium-based contrast agents are used to highlight inflammation, tumors, blood vessels, and abnormalities that might be invisible on non-contrast images. If your scan requires contrast, a technologist will insert an IV line (if you don't already have one), inject the dye mid-scan, and then run additional sequences. That process typically adds 10–20 minutes to the total time. You'll also wait a few minutes after the injection before the next sequences begin, since the dye needs to distribute through your tissues.
Each distinct set of images is called a sequence—think of it like a different camera setting capturing a different slice of information. A basic knee might use 5–6 sequences. A detailed brain scan for tumor staging could use 10 or more. More sequences = more time, simple as that. Your radiologist sets the protocol based on what your doctor is looking for, so you can't exactly negotiate the number—but knowing this helps explain why one MRI feels so much longer than another.
MRI images are extremely sensitive to motion. Even swallowing during a cervical spine scan can blur the images enough to require a repeat sequence. If you shift around, cough, or can't hold still, the technologist may need to rerun one or more sequences from scratch. This is probably the single biggest variable that patients can actually influence. More on that below.
Higher-field scanners (3T) can acquire images faster and at higher resolution than older 1.5T units, though the clinical difference for scan time isn't always dramatic. Open MRI scanners—which many claustrophobic patients prefer—often use lower field strengths and may take longer to acquire the same images. If scan time is a priority, ask whether a closed high-field scanner is an option for your type of study.
Functional MRI (fMRI), diffusion tensor imaging (DTI), MR spectroscopy, and other advanced protocols dramatically extend scan time. These are typically research or highly specialized clinical scans. If your order includes any of these, your technologist should tell you upfront to expect a longer session—sometimes 2 hours or more.
Equipment glitches happen. RF noise from a malfunctioning gradient coil, a patient call button accidentally pressed mid-sequence, or an image artifact that the radiologist wants re-run can all add 10–20 minutes. It's uncommon, but it's worth knowing that the estimated time you're given isn't always what you'll actually experience.
The scan itself is only part of your appointment. Here's a more realistic picture of total time at the imaging center:
Add it up and a "30-minute scan" easily becomes a 60–75 minute appointment at the facility. A 60-minute scan might mean you're there for 90 minutes or more. Budget accordingly when you schedule time off work.
If you're interested in MRI scan preparation and what the procedure actually involves, that's a solid overview of the full experience. And if you're studying for credentialing, our resources on magnetic resonance imaging cover the technical side in depth.
You can't control how many sequences your radiologist ordered, but you can absolutely control whether those sequences need to be repeated. Here's what actually helps:
This sounds obvious, but it's harder than it sounds when you've been lying still for 40 minutes and your nose itches. Before the scan starts, get your body into the most comfortable position you can sustain. Ask for a foam wedge under your knees if your lower back tends to ache. Scratch any itches before you slide into the bore. The few seconds of comfort prep can save you 10 minutes of rescan time.
MRI scanners are genuinely loud—some sequences hit 110 decibels, comparable to a jackhammer. The noise isn't harmful with proper hearing protection, but it's startling if you're not ready for it. Most facilities offer earplugs automatically; many also offer music through MRI-compatible headphones. The music helps pass the time and gives you a focal point instead of the banging.
If you're claustrophobic, tell your referring doctor and the scheduling staff before your appointment. There are options—open MRI, mild sedation, or anti-anxiety medication—that require advance planning. Showing up at the scanner and announcing severe claustrophobia mid-setup delays your scan and potentially everyone else's after you.
You'll be screened, but make sure you've removed everything metal before arriving—or at minimum before changing into your gown. Jewelry, hair clips, underwire bras, piercings, and even some cosmetics with metallic components need to come off. Metal causes image artifacts and, depending on the item, can be a safety hazard. Having to track down a safe place for your jewelry mid-appointment just adds time.
When the technologist is positioning you, ask them to briefly describe what each sequence will sound like and roughly how long it'll run. Many technologists will say something like "this next one is about 4 minutes and sounds like rapid clicking." That kind of heads-up makes the noises feel predictable rather than alarming, which makes it much easier to stay still.
For patients who can't hold still due to severe anxiety, dementia, or pediatric cases, sedation or general anesthesia is sometimes used. This extends total time significantly—you'll need time for anesthesia preparation, the scan itself, and recovery. Pediatric MRI under anesthesia is common because children can't reliably stay still, and the entire appointment at a children's hospital might run 2–4 hours when you factor in anesthesia induction and recovery. If your child is scheduled for sedated MRI, your team will give you detailed pre-appointment instructions including fasting requirements.
Open MRI scanners don't enclose you in a tube—they're more comfortable for claustrophobic patients and those with larger bodies. The trade-off is typically lower field strength (often 0.7T or 1.5T open vs. 3T closed), which can mean longer scan times to achieve comparable image quality. An open MRI knee scan that takes 30 minutes on a closed 3T scanner might take 45–50 minutes on a lower-field open unit. The clinical difference in image quality also matters for some diagnoses—your doctor or radiologist can advise whether open MRI is appropriate for your specific scan.
For career-related questions about becoming an MRI technologist, check our guide on MRI tech school and information about MRI tech salary expectations. Understanding MRI safety is also critical—both for patients and technologists in training.
Most patients can leave immediately after their scan and resume normal activities—there's no recovery time for a standard MRI without sedation. If contrast was used, drink plenty of water to help your kidneys flush the gadolinium. Results typically take 24–72 hours; your radiologist reads the images and sends a report to your referring physician, who will contact you with findings.
If you had sedation, you'll need someone to drive you home and should plan to rest for the remainder of the day. Don't make major decisions or operate heavy machinery for 24 hours after any sedation or anesthesia.
A standard brain MRI takes 30–45 minutes. If contrast is ordered or your doctor wants a more detailed protocol—such as for epilepsy, multiple sclerosis, or brain tumor follow-up—it can run up to 60 minutes. You'll also need to add check-in and setup time, so budget 60–90 minutes total at the imaging facility.
A lumbar, cervical, or thoracic spine MRI typically takes 45–60 minutes each. If your doctor orders imaging of the entire spine in one session (common for MS workups or certain spinal cord conditions), expect 90 minutes or more in the scanner. Full-spine appointments can run 2+ hours total including setup and check-in.
Yes — contrast MRI adds roughly 10–20 minutes to your scan. After the technologist injects the gadolinium-based dye through an IV, there's a short wait for the contrast to distribute through your tissues, then additional sequences are run to capture the enhanced images. Make sure to mention any kidney issues to your doctor before a contrast scan, as gadolinium is filtered by the kidneys.
Minor involuntary movements like breathing and your heartbeat are accounted for in most protocols. What you need to avoid is deliberate movement—shifting your body, scratching, or repositioning. Even small movements can cause image blur or artifacts that require repeating a sequence, which adds significant time. If you need to move or have a concern during the scan, use the call button and the technologist will pause the sequence.
The loud banging and clicking sounds come from rapidly switching magnetic gradient coils inside the scanner. These coils change the magnetic field thousands of times per second to create slice-by-slice images, and that rapid switching causes mechanical vibration in the coil housing. Different sequences produce different sounds—some are slower and rhythmic, others are fast and staccato. Earplugs or headphones with music can make the experience significantly more comfortable.
For most MRIs, no special preparation is needed the night before. However, abdominal MRIs often require fasting for 4–6 hours beforehand to reduce bowel movement artifacts. Pelvic MRIs may require a full bladder. Your scheduling team will give you specific prep instructions. Remove all metal-containing items before your appointment, and let your doctor know about any implants, prior surgeries, or claustrophobia so accommodations can be arranged in advance.
A knee MRI typically takes 30–45 minutes—it's one of the faster scans. A shoulder MRI runs a bit longer at 45–60 minutes because the shoulder's anatomy requires more imaging sequences. If you're getting an arthrogram (where contrast is injected directly into the joint before scanning), add another 15–30 minutes for the injection procedure performed before you enter the MRI room.
Before your appointment, run through this checklist to avoid delays and make sure your scan goes smoothly:
Understanding the MRI machine itself—how it works and what to expect from it—can also reduce anxiety significantly before your first scan. Knowledge is genuinely calming when you know exactly what that noise is and why it's happening.
If you're a student or professional in the field, our MRI vs CT scan comparison covers the technical and clinical differences between the two most common cross-sectional imaging modalities. And if you want to explore working in MRI, our resources on MRI tech school and magnetic resonance imaging credentials are a great starting point.
The bottom line on MRI timing: most scans run 30–60 minutes, you'll spend 60–90 minutes total at the facility, and staying still is the single biggest thing you can do to keep your scan efficient. Go in informed, stay calm, and you'll be done before you know it.