How Long Does an MRI Take? Scan Times by Body Part

If you are booking an MRI and wondering how much time to set aside, here is the short answer: most MRI scans take 15 to 45 minutes. The exact time depends on which body part is being imaged, how many sequences the radiologist needs, and whether contrast is used.

Below is a clear breakdown of how long an MRI takes by exam type, what makes a scan faster or slower, and how much total time to plan for from arrival to leaving.

How Long Does an MRI Take on Average?

A typical single-region MRI takes about 20 to 45 minutes of scan time. Simpler exams can be done in as little as 15 minutes, while more detailed studies — or scans of multiple regions — can run 60 minutes or longer. The machine captures a series of image "sequences," and each sequence adds a few minutes, which is why a more thorough exam takes more time.

Importantly, the loud knocking sound you hear is normal and expected — it is simply the magnetic gradients switching on and off as images are captured. You will be given ear protection.

MRI Scan Times by Body Part

Scan times vary by the area being imaged. These are typical ranges for the imaging itself (not counting check-in and prep):

Need details on a specific exam? See our pages on Brain MRI, Spine MRI, and whole-body MRI.

What Makes an MRI Take Longer?

Several factors add time to a scan:

• Contrast. If gadolinium contrast is needed, the technologist pauses to place an IV and add post-contrast sequences — usually 10–20 extra minutes.
• Multiple regions. Imaging two areas (for example, cervical and lumbar spine) roughly doubles the time versus one.
• Detailed protocols. Specialized studies — cardiac MRI, MR angiography, or AI-enhanced brain volumetry — require more sequences.
• Movement. Holding still is essential. If motion blurs an image, that sequence has to be repeated, which adds time.

What Makes an MRI Faster?

• A single, well-defined region with a standard protocol.
• No contrast when it is not clinically needed.
• Staying still and breathing as instructed so sequences do not have to be repeated.
• Modern high-field scanners. A 3T MRI can often capture the same detail faster than an older, lower-field magnet.

How Much Total Time Should I Plan For?

Beyond the scan itself, plan for check-in, a safety screening (a short questionnaire about metal implants, devices, and — if contrast is used — kidney and allergy history), and changing into a gown. A good rule of thumb: budget about an hour total for a standard single-region MRI, and up to 90 minutes for a contrast or whole-body study.

If you are claustrophobic, let us know in advance — an open MRI or comfort measures can make the time far easier, and knowing what to expect helps most patients relax.

Will the Time Change if I Do Not Have a Referral?

No. The scan time is the same whether your MRI is ordered by your doctor or requested directly as a self-pay patient. In Florida, self-pay patients can get an MRI without an outside referral — our physician reviews your request the same day, so the imaging itself still runs on the same schedule. Learn more in our guide, Do You Need a Referral for an MRI in Florida?

The Bottom Line

Most MRIs take 15 to 45 minutes to scan, with about an hour of total time from check-in to leaving. Contrast, multiple regions, and detailed protocols add time; a single region on a modern scanner is quickest. When you schedule at AMI, we will tell you the expected length for your specific exam so you can plan your day.

Ready to book? See MRI options and pricing or request an appointment.