Why Do You Have to Stay Still During an MRI? Understanding the Importance of Body Movement
Have you ever wondered why the MRI technologist asks you to stay completely still during an MRI scan?
Many patients find it difficult to remain in one position for 20–40 minutes. But staying still is very important for getting clear and accurate MRI images.
Let's understand why in simple words.
1. MRI Machines Capture Detailed Images of Your Body
MRI stands for Magnetic Resonance Imaging.
It uses a strong magnetic field and radiofrequency waves to produce detailed images of internal body structures such as:
Brain
Spine
Joints
Muscles
Ligaments
Internal organs
To capture these detailed images, the patient must remain still during scanning.
2. What Happens If You Move During an MRI?
When you move your body during an MRI scan, the position of the body changes while the machine is collecting signals.
This can create image problems called motion artefacts.
Motion artefacts may cause:
Blurred images.
Ghosting or repeated structures.
Loss of image sharpness.
Difficulty identifying small abnormalities.
Poor diagnostic image quality.
For example, if a patient moves their head during a brain MRI, the brain images may become blurred or show unwanted artefacts.
3. What Are Motion Artefacts in MRI?
Motion artefacts are unwanted patterns or distortions that appear in MRI images due to patient movement.
Common types of movement include:
Head movement.
Breathing movement.
Swallowing.
Body movement.
Movement of hands or legs.
These movements can affect the quality of the final images.
Example: During a brain MRI, even small head movements can affect image quality, especially in sequences that take longer to acquire.
4. Why Does Breathing Matter During MRI?
During some MRI examinations, breathing can affect image quality.
For example:
MRI Abdomen
MRI Liver
MRCP
MRI Upper Abdomen
The MRI technologist may ask you to hold your breath for a few seconds during certain sequences.
This helps reduce breathing-related motion artefacts and produces clearer images.
5. What Happens If You Move During Scanning?
If you move during image acquisition, the MRI technologist may need to repeat some sequences.
This can increase the total scanning time.
For example, if a sequence takes 4 minutes and movement affects the images, the technologist may need to acquire that sequence again.
Therefore, staying still helps save time and improves image quality.
6. Tips to Stay Comfortable During an MRI Scan
Here are some simple tips:
Choose a comfortable position before scanning begins.
Follow the MRI technologist's instructions.
Keep your body relaxed.
Avoid unnecessary head and body movements.
Use the earplugs or headphones provided.
Inform the technologist if you feel uncomfortable or anxious.
If you have difficulty staying still, inform the MRI staff before the examination.
7. Can I Move Between MRI Sequences?
Yes, but only when instructed by the MRI technologist.
Some MRI examinations contain multiple sequences. The technologist may communicate with you between sequences if repositioning or additional instructions are required.
Do not move unnecessarily during image acquisition.
Conclusion
Staying still during an MRI scan is very important because even small movements can affect image quality.
Movement can cause motion artefacts, blurred images and sometimes require repeated scanning.
Remember, Clear Images Need a Still Patient!
Follow your MRI technologist's instructions, stay relaxed and help make your MRI examination successful.
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