How Long Does an MRA Take From Start to Finish?

A magnetic resonance angiography (MRA) exam typically takes somewhere between 30 and 90 minutes from the moment you check in to the moment you walk out, with the actual scanning portion usually running 15 to 45 minutes depending on which blood vessels your doctor needs to see and what technique is used. That range is wide because an MRA of the brain’s arteries and an MRA of the leg vasculature are very different exams, and a contrast-enhanced scan has a different workflow than one without contrast. The time you spend in the scanner is also only part of the story, since preparation, potential contrast injection, and the wait for results all add to the total experience.

What Happens Before the Scanner Starts

The clock starts ticking well before any images are captured. When you arrive at the imaging center, you’ll fill out a safety screening form that asks about metal implants, pacemakers, surgical clips, and other objects that could be dangerous inside a powerful magnet. A technologist reviews that form with you, and you change into a gown if your clothing has metal fasteners or zippers. This check-in and preparation phase usually takes 10 to 20 minutes, though it can stretch longer if there are questions about an implant’s MRI compatibility that need to be resolved by the radiologist.

If your MRA involves contrast, a nurse or technologist places an intravenous line in your arm. The contrast agent used for MRA is a gadolinium-based compound, not the iodine-based dye used in CT scans. IV placement usually adds only a few minutes but occasionally takes longer if veins are difficult to access. Once the IV is in and you’re positioned on the scanner table, the technologist slides you into the bore of the magnet and the scanning begins.

How Long the Scanning Actually Takes, by Body Region

The body part being imaged is the single biggest factor in how long you’ll be on the table. Each region requires different pulse sequences, and some areas demand breath-holding or special timing to get clear pictures of moving blood vessels.

For a brain or intracranial MRA, the scan portion is relatively quick. A standard time-of-flight sequence of the brain’s arteries can be acquired in roughly five to ten minutes. When contrast-enhanced MRA is used for the brain and neck vessels, that acquisition can be even shorter while providing broader coverage that includes the neck arteries feeding the brain. A study comparing the two approaches in acute stroke patients found that contrast-enhanced MRA localized vessel blockages in less time while capturing both the intracranial and extracranial arteries in a single pass.¹ Most routine brain MRAs, including the localizer images and any additional sequences the radiologist wants, keep you in the scanner for about 20 to 30 minutes total.

Renal MRA, used to check the arteries supplying your kidneys, involves breath-hold sequences because the kidneys move with each breath. A typical breath-hold for a contrast-enhanced renal MRA lasts around 30 seconds per acquisition.² Multiple breath-holds are needed, along with pre-contrast and post-contrast sequences, so the total scanning time generally falls between 20 and 40 minutes. The need to coach you through breath-holds and check image quality between runs can add a few extra minutes compared to a straightforward brain scan.

Peripheral MRA of the legs tends to be the longest common exam. These scans cover a large territory, from the abdomen down to the feet, and often involve multiple “stations” where the table moves you through the magnet in stages. A study comparing non-contrast and contrast-enhanced techniques for leg artery disease found median total examination times of about 27 minutes for one non-contrast method, about 29 minutes for another, and roughly 31 minutes for contrast-enhanced MRA.³ Those numbers represent scanning time alone; add preparation and you’re looking at 45 minutes to over an hour for the full visit.

Cardiac MRA is in its own category. Imaging the heart’s arteries is tricky because the heart is constantly beating and the chest is constantly moving with respiration. Traditional cardiac MR sequences rely on electrocardiogram triggering and respiratory gating, which extends scan time. Research into real-time cardiac MRI techniques has demonstrated that eliminating the need for ECG triggering and breath-holding can cut acquisition time to roughly a third of the conventional approach while improving spatial resolution.⁴ Still, a full cardiac MRA exam with multiple views often keeps patients in the scanner for 30 to 60 minutes.

Contrast-Enhanced Versus Non-Contrast Techniques

Whether your MRA uses a gadolinium-based contrast agent affects both the workflow and the scanning time. Contrast-enhanced MRA (CE-MRA) requires precise timing: the contrast is injected through your IV, and the scanner captures images as the bolus of contrast travels through the arteries of interest. The injection itself takes only seconds. Injection rates in research settings have ranged from slow infusions around 0.5 milliliters per second to faster rates of 3 milliliters per second, depending on the clinical question and the vessel territory.⁵ The actual image acquisition during a CE-MRA sequence is often quite fast, sometimes under a minute for a single 3D dataset, but the overall exam includes pre-contrast calibration runs and post-contrast delayed images.

Non-contrast MRA techniques like time-of-flight rely on the natural flow of blood to generate signal, which means no IV line is needed. That saves the time spent placing an IV and the extra sequences used to time the contrast bolus. On the other hand, non-contrast acquisitions of certain vessel beds can take somewhat longer per sequence to achieve comparable image quality. For the leg arteries specifically, the data mentioned earlier showed that the non-contrast methods and the contrast-enhanced method were within a few minutes of each other in total exam time. The practical bottom line: if you’re anxious about needles, a non-contrast MRA might save you a bit of preparation time, but the total minutes in the scanner are broadly similar for most exams.

Why Your MRA Might Take Longer Than Expected

The estimates above assume a cooperative patient and a smooth technical run. Several things can stretch an MRA well beyond the typical range.

Movement is the most common culprit. MRA sequences are sensitive to motion because even small shifts blur the fine detail needed to see blood vessels. When a sequence is ruined by motion, the technologist has to repeat it. Research analyzing MRI log files found that the more a patient moved, the more likely sequences were to need repeating, and the cumulative time lost to repeated sequences across a study sample added up to more than four hours.⁶ For an individual patient, even one or two repeated sequences can add 5 to 15 minutes to the exam. Patients with tremors, pain that makes it hard to hold still, or difficulty following breath-hold instructions tend to have longer scan times.

Claustrophobia and anxiety can slow things down too. Some patients need breaks during the scan, or they may need to be repositioned after moving. Open-bore and wide-bore MRI machines are sometimes offered as alternatives for anxious patients, but individual MR sequences on those machines can take somewhat longer. Protocol data from a trial comparing a conventional tunnel scanner with an open-bore design showed that certain sequences ran 30 to 90 seconds longer on the open-bore system.⁷ The trade-off is comfort versus speed, and for a patient who otherwise could not complete the exam at all, a slightly longer scan on a more comfortable machine is clearly worth it.

Body habitus also plays a role. Larger patients require adjustments to the scanner’s field of view and sometimes need additional signal-averaging to get adequate image quality, which increases scan time. And if the initial images reveal an unexpected finding, the radiologist may ask the technologist to add extra sequences to investigate, which can tack on another 5 to 15 minutes you didn’t plan for.

Ultrafast Protocols for Emergencies

When speed is critical, particularly during a stroke, radiology departments have developed stripped-down MRA protocols that push scan times far below the usual range. A stroke MRI protocol described in the literature compressed the entire multimodal MR exam, including diffusion imaging, perfusion imaging, and MRA of the head and neck, into roughly six minutes of scan time. The researchers concluded that this abbreviated protocol provided good diagnostic quality and rivaled the speed of a CT-based stroke workup.⁸

Even more aggressive protocols have followed. A 2025 study tested an ultrafast MRI and MRA protocol that completed in about three minutes and found it could reliably identify acute ischemic stroke and large-vessel blockages with high accuracy, making it suitable as an initial triage tool.⁹ These protocols sacrifice some of the detailed vessel characterization you get from a full MRA exam, but in a stroke emergency, knowing whether a major artery is blocked matters far more than getting a complete map of every small branch. If you’re brought to the ER with stroke symptoms and sent for an MRA, expect the scanning itself to be fast, sometimes under ten minutes, with the real time cost being the transport and preparation around it.

How AI and New Techniques Are Shrinking Scan Times

The scan times patients experience today are likely to get shorter in the coming years. Compressed sensing combined with deep-learning image reconstruction is one of the most promising developments. In a recent study, researchers tested a cervical (neck) MRA technique that used artificial intelligence-assisted reconstruction and achieved diagnostic-quality images of the neck arteries in under one minute, specifically about 55 seconds, without requiring contrast or cardiac gating.¹⁰ Compared to a version of the same technique without AI enhancement, the AI-assisted version maintained image quality at the faster speed.

The practical impact of these advances is cumulative. An MRA exam typically consists of several individual sequences run back to back. If each sequence can be shortened by even 30 to 60 seconds through better acceleration and reconstruction, the total saving across a full exam can easily reach 5 to 10 minutes. For a peripheral MRA that currently runs half an hour, shaving off a third of that time makes the experience meaningfully more comfortable, especially for patients who struggle to hold still. These accelerated techniques are already appearing in newer clinical scanners, though availability varies by hospital and machine model.

When You’ll Get Your Results

The MRA itself is only half the waiting game for most patients. After the scan, the images go to a radiologist who reviews them and generates a report for your referring doctor. How long that takes depends on the clinical setting and the urgency of the exam.

In emergency departments, preliminary reads are often available within minutes. For outpatient MRAs, the turnaround is longer. A study of radiology report turnaround times found that MRI reports took a median of several hours to be finalized, with one institution reporting second-signature turnaround times dropping from around 1,050 minutes to roughly 400 minutes after implementing subspecialized reporting.¹¹ In practical terms, that means your doctor may have the official report within one to three business days for a routine outpatient MRA. Some imaging centers now offer patient portal access where results appear a day or two after they are finalized, though interpretation of what the report means still belongs with your physician.

If your MRA was ordered urgently or shows something unexpected, the radiologist typically contacts your doctor directly with a phone call or a secure message, and you may hear back the same day. For routine screening MRAs, such as those checking for an aneurysm in someone with a family history, expect the slower outpatient timeline.

Tips to Keep Your Appointment on Track

You can’t control the scanner, but you can control some of the factors that extend an MRA appointment. Arriving early enough to complete paperwork without feeling rushed helps. Wearing comfortable clothing without metal, like sweatpants and a cotton T-shirt, can save a wardrobe change. Knowing ahead of time whether your exam involves contrast allows you to ask about IV placement logistics, and if you have a history of difficult IV access, mentioning that when you schedule can help the center prepare.

During the scan, the single most useful thing you can do is hold still. Every repeated sequence adds minutes. If you know you tend to get anxious in enclosed spaces, tell your doctor when the MRA is ordered rather than when you’re already on the table. Mild sedation or anti-anxiety medication can be arranged in advance, and scheduling at a facility with a wide-bore or open-bore machine is sometimes an option. For breath-hold sequences, practicing a consistent hold at home (breathe in, hold for 20 to 30 seconds, exhale) gives you a sense of what will be asked and builds some confidence.

Pediatric MRA and the Sedation Factor

For children, the timeline can look quite different. Young children often cannot hold still for the duration of an MRA, and infants certainly cannot follow breath-hold instructions. Many pediatric MRAs require sedation or general anesthesia, which adds substantial time to the visit. The sedation process itself, from induction to recovery, can turn a 30-minute scan into a two- to three-hour appointment when you count pre-sedation fasting requirements, the anesthesia team’s assessment, the induction period, the actual scan, and the post-sedation observation period during which the child must demonstrate alertness and the ability to drink fluids before being discharged.

Advances in fast MRI techniques are particularly significant for pediatric patients, because shorter scan times increase the chances of completing an exam without sedation in older toddlers and school-age children. Some pediatric centers now use feed-and-sleep protocols for infants, timing the scan to coincide with a nap after a feeding. When it works, this approach avoids sedation entirely. When it doesn’t, and the baby wakes up mid-scan, the team may need to reschedule, which adds an entirely different kind of delay to the process.