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MRI

Last Updated: April 2026

Magnetic resonance imaging (MRI) is a diagnostic imaging system using radio waves, an extremely strong magnetic field, and a computer to visualize internal organs of the human body and obtain diagnostic information. An MRI creates images of the body in thin “slices,” similar to slicing a loaf of bread, allowing doctors to see inside the body layer by layer. Compared to a CT scan, MRI shows differences between soft tissues more clearly.

MRI images are produced without the use of ionizing radiation. The procedure is considered very safe, and significant side effects are rare. The procedure is painless and non-invasive, though you may feel a slight warmth in the area being scanned. You will hear loud tapping or knocking sounds, which is normal as the machine works to capture the images. To ensure your comfort, you will be provided with earplugs or headphones. In some instances, contrast agents, such as gadolinium, are used to enhance certain anatomical structures and increase the diagnostic accuracy of the images.

Magnetic resonance imaging (MRI) is one of the advanced imaging technologies utilized at Akumin and is used to examine virtually all areas of the body. MRI produces highly detailed images of the head, neck, spine, muscles, joints, and bones, and is also commonly used to evaluate the head, spine, joints, abdomen, and pelvis, in addition to veins and arteries of the body.

Akumin offers a range of specialized MRI exams tailored to specific diagnostic needs, including prostate MRI, cardiac MRI, and advanced brain MRI analysis at many of our outpatient imaging centers. Patients living with pain stimulators can also learn about MRI safe scanning options. MRI is especially valuable because it often allows physicians to differentiate abnormal (diseased) tissue from normal tissue more clearly than other imaging modalities such as X-ray, CT, or ultrasound, supporting more accurate diagnosis and personalized care.

Wide-Bore MRI

The wide-bore MRI is an enhanced version of the typical MRI machine used in medical imaging. Think of an MRI machine as a cylindrical apparatus; the central “chamber” where patients lie for scans is the focal point. While conventional MRI machines have a chamber about 60 cm across, the wide-bore MRI boasts a wider diameter, often 70 cm or more.

This expanded size offers multiple benefits. It’s especially beneficial for claustrophobic individuals or those with a larger build, offering more comfort and reducing anxiety. Moreover, even with its bigger size, the wide-bore MRI ensures top-notch image quality crucial for medical evaluations. Essentially, it pairs heightened patient comfort with the exacting standards of medical imaging.

Open MRI

An open MRI machine is primarily used for claustrophobic, pediatric, or bariatric patients. Traditional MRI scanners are cylinder shaped and can be noisy. For some patients, this causes a lot of anxiety, and they sometimes avoid or delay undergoing the exam completely. An open MRI scanner helps alleviate some of these concerns since instead of being in cylindrical shape, these machines do not fully surround the patient’s body and are typically open on two or three sides. They also produce lesser noise levels making the duration of the scan less stressful for the patient.

Due to the shape of the open MRI, it is not always possible to take images of certain areas of the body and the images it produces can be of lesser quality as the magnet strength of the open MRI is less than that of a closed or wide-bore MRI. For this reason, an open MRI is not always an option for all patients, and some scans must be performed on a traditional cylindrical MRI machine.

Akumin offers open MRI imaging at over 20 center locations in 6 states. Visit our Locations page for a full list of centers and their service offerings.

Upright MRI

Akumin is proud to offer the latest high field, full-body upright MRI scanner that can scan patients in the sitting or standing position. This technological breakthrough is second to none in the MRI imaging world and can be reimbursed by most insurance carriers at no additional cost to the patient.

In traditional MRI and CT scans, patients lie flat on their back during the exam. A stand-up MRI allows imaging while you are sitting or standing, helping doctors evaluate your body in positions such as bending or turning.

A stand-up MRI can be especially helpful for evaluating the spine and joints because it allows doctors to see your body in natural, weight-bearing positions—such as sitting or standing. In some cases, this can reveal problems that may not be as visible when lying down. However, not all conditions require this type of imaging, and your doctor will choose the MRI approach that provides the most accurate results for your needs.

Patients who might be considered for upright MRI include:

Patients who are claustrophobic
Patients who are obese or exceptionally large (including some endocrine patients)
Patients who are unable to lie supine for the duration of their scan
Patients who need to be observed in upright or seated positions during their scan

Benefits of an upright MRI:

Image quality is exceptionally good, and all studies are reported by specialist radiologists
Claustrophobia is not a problem with this scanner
It can be used in a variety of clinical situations where conventional MRI is unsuitable
It can sometimes reveal pathology not identified with conventional MRI

MRI Machine Type	Typical Magnetic Field Strength (Tesla)	Best Use Cases	Patient & Imaging Considerations
Cylindrical-Bore MRI Machine	1.5T–3T	Advanced brain, spine, cardiac, musculoskeletal, and abdominal MRI exams	Provides the highest image quality and supports advanced diagnostic imaging; open at both ends, the design may be uncomfortable for patients with claustrophobia
Wide-Bore MRI Machine	1.5T–3T	Patients seeking more comfort while maintaining high-resolution MRI imaging	Wider opening improves patient comfort compared to standard cylindrical MRI scanners while delivering high-field image quality
Open MRI Machine	Low- to mid-field	Patients with claustrophobia, larger body types, or pediatric patients undergoing routine MRI scans	Open design reduces anxiety and improves accessibility; may have longer scan times or reduced image detail for complex MRI studies
Upright MRI Machine	Mid-field	Patients requiring seated or standing MRI exams, including weight-bearing musculoskeletal imaging	Enables functional and positional imaging; availability may be limited and not suitable for all MRI procedures

Akumin also offers specialized MRIs such as cardiac MRI, prostate MRI, advanced brain MRI analysis, and safe MRI procedures for patients with paint simulators at many of our centers.

Prior to scheduling, discuss any concerns with your provider. In many cases, wide-bore systems offer an effective compromise—providing the diagnostic power of high-field MRI with more space and comfort. Your medical team will select MRI machines that align with the clinical indication and your comfort preferences.

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Frequently Asked Questions (FAQS)›

What is the difference between open MRI machine and wide-bore MRI?

Open MRI scanners have an open design with more space around you, which can help reduce feelings of claustrophobia and make the experience more comfortable.

Wide-bore MRI scanners are still cylindrical but have a wider opening (about 70 cm compared to standard machines), giving you more room while maintaining high-quality imaging. These systems provide detailed images similar to traditional MRI scanners, while offering improved comfort for many patients.

The best option depends on your specific exam and comfort needs. At Akumin, both open and wide-bore MRI options are available, and your care team will help choose the right scanner for you.

Are imaging results the same despite the MRI machine?

Image quality can vary depending on the type of MRI scanner and how the exam is performed. In general, traditional and wide-bore MRI machines provide the most detailed images and are often used for more complex exams.

Open MRI scanners can work well for many routine studies and may be a better option for patients who need more space or feel uncomfortable in enclosed areas. However, they may not always capture the same level of detail as other MRI systems.

Your care team will choose the MRI scanner that best fits your medical needs while also keeping your comfort in mind.

Is MRI procedure safe?

Yes. MRI is considered very safe for most patients because it does not use radiation. Before your exam, you’ll be carefully screened to make sure any implants or devices you may have are safe for MRI. During the scan, a technologist will monitor you the entire time to ensure your comfort and safety. In some cases, a contrast agent may be used to improve image quality and reactions to this are rare. If you have certain medical conditions, such as severe kidney disease, or specific implants, your care team will review everything with you ahead of time to make sure MRI is safe for you.

Does MRI use radiation?

No, MRI does not use radiation. Instead, it employs an extremely strong magnetic field and radiofrequency energy to produce images of the body’s internal structures. This makes MRI a preferred imaging choice for many applications, especially when repeated scans are necessary, as it minimizes the patient’s exposure to radiation.

How long will it take to get MRI?

Most MRI exams take 20 to 60 minutes, depending on the body area, the number of scans, and whether contrast is used. Complex studies, cardiac imaging, or multi-body part exams may take longer.

You should also allow extra time for check-in, safety screening, and any preparation required. The type and speed of the MRI scanner can further influence the total duration.

Contributors

Dr. Nasir Siddiqui, MBA
Chief Medical Officer

Dr. Siddiqui is a board-certified diagnostic radiologist with over 15 years of experience advancing innovation across imaging, healthcare technology, and clinical operations. He currently serves on the Board of Directors at Learner’s Digest International, a leading provider of continuing medical education. Trained at the University of Pittsburgh Medical Center and Northwestern University, Dr. Siddiqui also holds an MBA from the University of Chicago Booth School of Business. He is recognized for leveraging data, AI, and workflow optimization to enhance access, efficiency, and patient outcomes across imaging services.

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