Whether you’re heading in for a scan, supporting a loved one, or just curious about medical technology, you might wonder: how big is an MRI machine? Knowing its size can help ease anxieties, prepare for appointments, or satisfy simple curiosity.
Understanding MRI machine dimensions is important for comfort, accessibility, and planning. In this article, you’ll find clear answers, helpful tips, and insights on what to expect when it comes to MRI machine size.
Related Video
How Big Is an MRI Machine? A Complete Overview
Magnetic Resonance Imaging, better known as MRI, is a cornerstone of modern medical diagnostics. But if you’ve ever wondered, “How big is an MRI machine?” you’re not alone. From their imposing presence in hospital rooms to their central tunnel, MRIs can look intimidating. Let’s break down what makes up an MRI machine, how their size matters, the different types you might encounter, and tips for a more comfortable experience.
The Quick Answer: MRI Machine Sizes Explained
MRI machines are large pieces of equipment designed to fit patients safely and comfortably while producing clear images of internal body structures. The size of an MRI machine varies based on the type:
- Traditional (Closed) MRI: The inner tube (or bore) is typically about 60 centimeters (23.6 inches) in diameter. The outer housing may be up to 2 meters (6-7 feet) tall and as long as 7 feet.
- Wide-Bore MRI: A newer design, offering approximately 70 centimeters (27.5 inches) of bore diameter. The outer dimensions are similar to traditional models, but the tube is wider.
- Open MRI: Instead of a tube, these use a more spacious, open design. Sizes vary greatly, but the patient isn’t fully enclosed.
The Anatomy of an MRI Machine
MRI machines are intricate medical devices. Here’s what you’ll see:
- The Bore: The tube patients lie in, where the scanning happens.
- Magnet Housing: A powerful magnet surrounds the bore, creating the field needed for imaging.
- Patient Table: Slides in and out of the bore, holding the patient still during the scan.
- Console Room: Where technicians operate the machine – typically separated by a window.
Breaking Down the Dimensions
- Length and Height: Most MRI machines are about 7 feet long. Their height can reach 7 feet as well, depending on the model.
- Bore Diameter: The opening ranges from 60 cm (about 2 feet) in standard designs to 70 cm (almost 2.5 feet) in wide-bore MRIs.
- Open MRIs: These can be much larger side-to-side but may be less deep.
Types of MRI Machines and Their Sizes
1. Traditional (Closed) MRI
- Size: About 60 cm bore, 7 feet long and 7 feet high.
- Design: The patient lies inside a long, cylindrical tube.
- Best For: High-detail imaging; ideal for most medical cases.
Benefits
- Produces the clearest, most detailed images.
- Preferred for complex scans, such as brain or spinal cord imaging.
Challenges
- Some people can feel claustrophobic due to the narrow bore.
- Larger or taller patients may have limited space.
2. Wide-Bore MRI
- Size: Bore diameter increased to about 70 cm.
- Design: Similar outer size as traditional models but with more patient room inside.
- Best For: Larger individuals, or those who need more room.
Benefits
- Extra space helps ease claustrophobia.
- Accommodates a wider range of body types.
Challenges
- Image quality is still excellent, though in some cases, the traditional bore may provide slightly more precision.
3. Open MRI
- Size: No tube; horizontal panels above and below with open sides.
- Dimensions: The space around the patient is much greater, though the magnets used are often less powerful.
- Best For: Severe claustrophobia, young children, or patients with larger body sizes.
Benefits
- Greatly reduces feelings of confinement.
- Allows for assistance from a friend or parent in the room during pediatric scans.
Challenges
- Images may not always be as sharp as with traditional or wide-bore designs.
- Not all types of scans are possible.
Practical Implications of MRI Size
Why the Size Matters
The size of an MRI machine isn’t just a design choice—it directly impacts both comfort and diagnostic power.
- Comfort: A wider or open bore helps patients who feel anxious or claustrophobic.
- Accessibility: Larger interiors accommodate bigger patients, making advanced imaging more accessible.
- Image Quality: In general, closed (narrower) MRI machines have the strongest magnets and provide the highest image quality.
The Patient Experience
If you’re scheduled for an MRI, knowing what to expect can help.
Before the Scan
- Dress comfortably and avoid metal objects.
- Tell the technician if you’re worried about tight spaces or have implants.
During the Scan
- You’ll lie on a table that slides into the bore.
- Most scans last 15-60 minutes.
- The machine is loud—headphones or earplugs are often provided.
- Stay as still as possible for clear images.
After the Scan
- The table slides out, and you can leave right away—no lingering side effects.
- Results are reviewed by a radiologist and sent to your doctor.
Choosing the Right MRI Machine
If you have a choice, consider these tips:
- Ask About Options: Many centers offer multiple machine types—mention if you’re anxious or need more space.
- Request a Wide-Bore or Open MRI: Especially helpful if you have a larger body or claustrophobia.
- Communicate: Talk openly with your provider about concerns. They can recommend the best fit.
Comparing MRI Machine Sizes at a Glance
| Machine Type | Bore Diameter | Length | Comfort Level | Image Quality |
|---|---|---|---|---|
| Traditional (Closed) | 60 cm (~2 ft) | ~7 feet | Moderate (tight) | Highest |
| Wide-Bore | 70 cm (~2.3 ft) | ~7 feet | Higher (roomier) | Very High |
| Open | Varies | Varies | Highest (open sides) | Good to Fair |
The Benefits and Challenges of Different MRI Sizes
Benefits of Larger (Wide-Bore/Open) MRIs:
- Reduces Anxiety: More space equals less feeling of confinement.
- Accommodates All Patients: Larger diameters are essential for bigger bodies.
- Easier for Children: Open designs make it possible for a parent to be nearby.
Challenges:
- Image Detail: Sometimes, strongest images come from closed MRIs.
- Availability: Not all medical facilities have wide-bore or open MRIs.
- Magnet Strength: Open MRIs often use weaker magnets, which can limit scan types.
Tips for a Comfortable MRI Experience
- Prepare Mentally: Knowing the size and sounds of the machine helps reduce anxiety.
- Ask Questions: Before your appointment, call the imaging center to ask about machine type and size.
- Request Comfort Items: Some centers offer blankets, music, or even movies.
- Use Relaxation Techniques: Deep breathing or guided imagery can help you relax.
- Bring a Friend: Sometimes, having someone waiting nearby can be reassuring.
MRI Machine Size in Everyday Terms
Still wondering how big that machine is? Imagine this: A typical closed MRI is like a large donut with a narrow tunnel running through the middle—long enough for an adult to lie flat, encased in a housing about the size of a large refrigerator set on its side. Wide-bore MRIs give you more breathing room, while open MRIs feel more like lying between two big shelves.
Common Myths About MRI Machine Size
- Myth: All MRI machines are tiny tubes.
- Today, many options exist, including open designs.
- Myth: Larger MRIs have lower quality.
- Wide-bore MRIs provide almost the same detail as standard ones.
- Myth: All facilities use the same size.
- Machine size and type can vary widely depending on the location.
In Summary
MRI machines are significant in both size and diagnostic ability. Traditional closed models are about 7 feet long with a bore diameter of 60 cm, while wide-bore models expand the space to 70 cm. Open machines vary widely in form, prioritizing patient comfort over image detail in some cases. Knowing the types of machines and how size impacts your scan can help you feel more at ease and make informed decisions.
Frequently Asked Questions (FAQs)
How big is a standard MRI machine?
A standard (closed) MRI machine is usually about 7 feet long, with a bore (tunnel) diameter of about 60 centimeters (about 2 feet). The entire unit is similar in size to a large home appliance, like a refrigerator laid on its side.
Will my entire body fit inside the MRI machine?
For most scans, your whole body may go inside, especially for scans of the head, torso, or spine. Wide-bore and open MRIs offer more room for larger patients and those who may have mobility concerns.
How does the size of the MRI impact the scan?
A larger bore or open design makes the scan more comfortable, especially for people prone to claustrophobia. Traditional closed MRIs often provide the highest image clarity, but wide-bore and open MRIs are excellent alternatives for many uses.
Can I request a specific MRI size or type?
Yes, you can request a particular machine type—especially if you have concerns about tight spaces. Not all centers have every type, so it’s best to discuss your needs with your doctor or the imaging facility in advance.
What if I’m too big or tall for a standard MRI machine?
Many imaging centers now offer wide-bore or open MRI machines, ideal for larger or taller individuals. It’s important to tell the imaging center about your size so they can schedule you on an appropriate machine and ensure your comfort.
Understanding how big an MRI machine is—and how machine size can influence your experience—can reduce anxiety and help you approach your scan with confidence. If you have questions or worries, reach out to your doctor or the imaging center before your appointment.
You deserve an experience that is both comfortable and informative, leading to the best results for your health and peace of mind.