What is MRI? | Does MRI Use Radiation? (Complete Guide)

 

What is MRI? | Does MRI Use Radiation? (Complete Guide)

What is MRI?

MRI stands for Magnetic Resonance Imaging.
It is an advanced medical imaging test used to see detailed images of soft tissues inside the body.

MRI is commonly used to examine:

• Brain

• Spine

• Joints (knee, shoulder)

• Abdomen & pelvis

• Muscles and nerves

MRI provides high-quality and detailed images, which helps doctors make an accurate diagnosis.

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How does MRI work?

An MRI machine uses:

• A strong magnetic field

• Radiofrequency (RF) waves

• A powerful computer system

In simple words:

• The magnet aligns hydrogen atoms in the body

• RF waves send and receive signals

• The computer converts these signals into images

👉 No X-rays are used in MRI.

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❓ Does MRI use radiation?

No ❌ MRI does NOT use radiation.

This is an important point:

• MRI does not use ionizing radiation like X-ray or CT scan

• It works only with magnetism and radio waves

• Therefore, MRI is considered a safe imaging modality

✔ Suitable for follow-up studies
✔ Safer option for children
✔ Can be done in pregnancy (only if advised by a doctor)

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Difference between MRI and CT Scan

MRI	CT Scan
No radiation	Uses radiation
Best for soft tissues	Best for bones & lungs
Longer scan time	Faster scan
Uses magnet	Uses X-rays

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Precautions before MRI

Before undergoing MRI, inform the technician if you have:

• Pacemaker

• Metal implants or surgical clips

• Cochlear implant

• Any metallic foreign body

Remove all metallic items such as:

• Jewelry

• Watch

• Mobile phone

• Belt, coins, keys

Patients with claustrophobia (fear of closed spaces) should inform staff in advance.

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Why is MRI done?

Doctors may advise MRI for:

• Brain stroke or tumor

• Spine problems and disc disease

• Joint injuries

• Tumor and infection detection

• Nerve-related conditions

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Conclusion

✔ MRI is a safe, painless, and advanced imaging test
✔ No radiation exposure in MRI
✔ Excellent for detailed soft-tissue evaluation

If you have any questions related to MRI or other imaging tests, feel free to comment.
Radiographic Gyan is always here to guide you.