An MRI scan (Magnetic Resonance Imaging) is one of the most advanced and accurate medical imaging techniques used today. Doctors rely on MRI scans to diagnose diseases of the brain, spine, joints, heart, and internal organs without using harmful radiation.
Unlike X-rays or CT scans, MRI uses strong magnetic fields and radio waves to create detailed images of soft tissues. This makes it extremely useful for detecting conditions that cannot be seen clearly on other imaging tests.
In this complete guide, you will learn what an MRI scan is, how it works, why it is done, its procedure, benefits, risks, cost, and preparation tip
What Is an MRI Scan?
An MRI scan is a non-invasive diagnostic test that produces high-resolution images of organs, tissues, and bones inside the body.
MRI stands for Magnetic Resonance Imaging. It does not use X-rays. Instead, it uses:
Powerful magnets
Radiofrequency waves
Computer processing
These elements work together to create clear, detailed images.
How Does an MRI Scan Work?
The human body contains a large amount of water. When you enter the MRI machine:
Strong magnets align hydrogen atoms in your body
Radio waves disturb this alignment
When atoms return to their normal position, they emit signals
These signals are converted into images by a computer
This technology allows doctors to see even tiny abnormalities.
Why Is an MRI Scan Done? (Uses of MRI Scan)
1. Brain & Nervous System
Brain tumors
Stroke
Multiple sclerosis
Seizures
Head injury
Migraines
2. Spine & Back Problems
Slip disc
Spinal cord injury
Nerve compression
Back pain
Sciatica
3. Joints & Muscles
Knee injuries
Ligament tears
Sports injuries
Arthritis
Muscle damage
4. Heart & Blood Vessels
Heart structure
Blood flow problems
Congenital heart disease
5. Abdomen & Pelvis
Liver disease
Kidney problems
Uterine fibroids
Ovarian cysts
Prostate issues
6. Cancer Detection
Tumor detection
Cancer staging
Monitoring treatment response
Types of MRI Scans
1. Standard MRI
Used for general imaging of organs and tissues.
2. MRI with Contrast
A special dye (gadolinium) is injected to enhance image clarity.
3. Functional MRI (fMRI)
Measures brain activity by detecting blood flow changes.
4. Cardiac MRI
Used specifically for heart evaluation.
5. Open MRI
Designed for claustrophobic or obese patients.
MRI Scan Procedure (Step-by-Step)
Before the Scan
Remove metal objects (jewelry, watch, phone)
Inform doctor about implants or pacemakers
Change into hospital gown
Fasting may be required for contrast MRI
During the Scan
You lie on a movable table
Table slides into the MRI machine
Loud knocking sounds occur (earplugs provided)
You must stay still
Scan lasts 20–60 minutes
After the Scan
You can resume normal activities
If contrast was used, drink plenty of water
Results are reviewed by a radiologist
Is MRI Scan Painful?
No. An MRI scan is completely painless.
However, some people may feel:
Discomfort from lying still
Anxiety due to enclosed space
Mild warmth in the scanned area
MRI Scan Side Effects & Risks
MRI scans are considered extremely safe.
Possible Risks
Claustrophobia
Allergic reaction to contrast (rare)
Issues with metal implants
⚠️ MRI is NOT recommended for patients with:
Pacemakers
Cochlear implants
Metal fragments in the body
Always inform your doctor beforehand.
MRI Scan vs CT Scan
| Feature | MRI Scan | CT Scan |
|---|---|---|
| Radiation | ❌ No | ✅ Yes |
| Soft tissue detail | Excellent | Moderate |
| Scan time | Longer | Shorter |
| Bone imaging | Less ideal | Better |
| Safety | Very high | Moderate |
MRI Scan Cost in Pakistan
The cost of an MRI scan in Pakistan depends on the body part and facility.
Average MRI Scan Prices
Brain MRI: PKR 12,000 – 18,000
Spine MRI: PKR 15,000 – 25,000
Knee MRI: PKR 10,000 – 18,000
MRI with contrast: PKR 20,000 – 35,000
Prices may vary by city and hospital.
How to Prepare for an MRI Scan
Wear loose, metal-free clothing
Inform about pregnancy
Mention kidney problems (for contrast MRI)
Take anxiety medication if prescribed
Arrive 30 minutes early
MRI Scan During Pregnancy
MRI is generally safe during pregnancy, especially after the first trimester. However:
Contrast MRI is usually avoided
Only done if medically necessary
Always consult your doctor.
MRI Scan Results
MRI results are interpreted by a radiologist and shared with your doctor.
Result Timeline
Same day to 48 hours
Urgent cases: within hours
Benefits of MRI Scan
No radiation exposure
Highly detailed images
Early disease detection
Accurate diagnosis
Safe for repeated use
FAQs – MRI Scan
1. How long does an MRI scan take?
Usually 20 to 60 minutes, depending on the body part.
2. Can MRI detect cancer?
Yes, MRI is highly effective in detecting and staging cancer.
3. Is MRI scan safe?
Yes, MRI is one of the safest imaging tests available.
4. Can I eat before MRI scan?
Yes, unless fasting is required for contrast MRI.
5. Is MRI better than CT scan?
For soft tissues, brain, and nerves—yes.
MRI Scan in Karachi & Pakistan
MRI scans are widely available in:
Government hospitals
Private diagnostic centers
Tertiary care hospitals
Booking through online health platforms helps reduce waiting time.
Final Thoughts
An MRI scan is a powerful diagnostic tool that helps doctors detect diseases accurately without radiation. Whether it’s brain disorders, spine issues, joint injuries, or cancer detection, MRI plays a vital role in modern healthcare.
If your doctor recommends an MRI scan, there’s no need to worry—it is safe, painless, and highly informative.
🧠 Early diagnosis saves lives—don’t delay your MRI scan.