MRI Insights > MRI's Practical Application: A Closer Look
MRI’s Practical Application: A Closer Look
Author: Lawrence Reyes, MBA, MRSO, PGC-MRI I 23 April 2024
Magnetic resonance imaging (MRI) is a medical imaging technique that uses a strong magnetic
field and radio waves to create detailed images of the inside of the body. MRI is a non-invasive
procedure that does not involve needles or incisions.
MRI scans can be used to diagnose a wide variety of medical conditions, including:
Brain and spinal cord disorders
Heart disease
Cancer
Bone and joint disorders
Soft tissue injuries
Vascular diseases
Infections
MRI scans also guide minimally invasive procedures, such as biopsies and needle aspiration.
How does MRI work?
MRI works by using a strong magnetic field to align the protons in the water molecules in the body.
When a radiofrequency pulse is applied, the protons absorb energy and change their alignment.
When the radiofrequency pulse is turned off, the protons release the energy they absorbed and
realign with the magnetic field. This realignment of the protons produces a signal detected by the
MRI scanner. It is used to create images of the body.

A more comprehensive overview of the science behind MRI imaging is provided in the following
video (Science Museum, 2019): https://www.youtube.com/watch?v=nFkBhUYynUw
Types of MRI scans
There are many different types of MRI scans, each used to image a specific body part or diagnose a
particular medical condition. Some of the most common types of MRI scans include:
Brain MRI: This type of MRI scan is used to image the brain and spinal cord. It diagnoses various brain disorders, including stroke, tumours, and multiple sclerosis.
Heart MRI: This MRI scan images the heart and blood vessels. It is used to diagnose heart disease, suchas coronary artery disease and heart failure.
Knee MRI: This MRI scan is used to image the knee joint. It is used to diagnose knee injuries, such as torndivgaments and cartilage.
Shoulder MRI: This type of MRI scan is used to image the shoulder joint. It is used to diagnose shoulder injuries, such as rotator cuff and labrum tears.
Hip MRI: This MRI scan is used to image the hip joint. It is used to diagnose hip injuries, such as torn labrums and cartilage.
What are the risks of MRI?
MRI is a safe procedure with few risks. The most common risk is claustrophobia, or the fear of
enclosed spaces. Other risks include:
Allergic reaction to the contrast dye that is sometimes used during an MRI scan.
Movement artifacts, which can occur if the patient moves during the scan.
Heating, which can occur in very rare cases.
What should I do before an MRI scan?
If you have an MRI scan, you must remove all metal objects from your body, including jewellery,
watches, and hearing aids. You may also need to change into a hospital gown.

If you are taking any medications, be sure to tell your doctor. Some medications, such as pain patch
medication, can interfere with the quality of the MRI images.
What happens during an MRI scan?
You will lie on a table that slides into the MRI scanner during an MRI scan. The scanner is a large,
tube-shaped machine with a powerful magnetic field. You will be asked to lie still during the scan.
The scan is painless, but you may hear loud noises from the scanner.

The entire scan usually takes about 30 minutes, but it can take longer depending on the type of
scan you are having.

A more detailed explanation of how MRI works can be found in the following video (Siemens
Healthineers, 2021):
https://www.youtube.com/watch?v=g-jj4KrmYPI
What happens after an MRI scan?
You can usually go home immediately after an MRI scan. However, if you have contrast dye, you
must be clear of any allergic reaction before driving.

Your doctor will discuss the results of your MRI scan with you.
About the Author
Lawrence Reyes is a seasoned MRI radiographer and a certified Magnetic Resonance Safety Officer with a rich background in healthcare management. With decades of experience, he has led transformations in MRI services and developed comprehensive training programs in the UK and Singapore. Lawrence is passionate about improving MRI safety protocols and patient care through education and innovative management strategies. As a leader and educator, he continues to share his expertise widely. For more about Lawrence and his work, connect with him on LinkedIn.
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MRI Practical Application: A Closer Look

Magnetic resonance imaging (MRI) is a medical imaging technique that uses a strong magnetic field and radio waves to create detailed images of the inside of the body. MRI is a non-invasive procedure that does not involve needles or incisions.

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