What is MRI (Magnetic Resonance Imaging)? Why is MRI done?

MRI (Magnetic Resonance Imaging) is a test used to diagnose several medical conditions. This is an imaging test, which means it can be used to find out more about what is happening in the body. This test can be used to look at bones, muscles, brain substances, joints, arteries, and more. MRI is one of the least harmful tests available and is used by physicians around the world to make accurate diagnoses and treatment plans.

How does MRI work?

MRI uses strong magnets to generate a strong magnetic field. When a person is placed on an MRI machine, a strong magnetic field forces the protons in the body to align with the magnetic field. Sensors in the machine can detect the speed at which protons move and create images. Different tissues in the body have molecules that move at different speeds. A trained radiologist can distinguish the type of tissue shown in the image.

What is MRI used for?

MRI is usually prescribed by a doctor to get a closer look at what is happening inside the patient’s body. Especially good for giving insights into soft tissues and the nervous system. It can be done on any part of the body to diagnose the condition, determine the degree of the condition, see if the patient is responding well to the treatment, and understand the degree of injury. Used for MRI is important for imaging the nervous system and finding the following conditions:

  • Brain injury
  • stroke
  • cancer
  • Blood vessel damage
  • Multiple sclerosis or MS
  • Inner ear problems
  • Evaluate spinal and other joint injuries, degeneration, etc.
  • Eye problems

When MRI is prescribed to the heart and circulatory system, you can look for:

  • Heart disease
  • Abnormalities associated with the structure of the heart
  • Occlusion of blood vessels
  • Degree of damage from heart attack

MRI of the bone and musculoskeletal system can detect:

  • cancer
  • Damaged joint
  • Bone infection
  • Degree of spinal damage
  • Damage to nerves in the spine

Other organs for which MRI is used are:

  • kidney
  • liver
  • breast
  • pancreas
  • Ovary
  • prostate

Functional MRI or fMRI is used to map the functional aspects of the brain. Visualize blood flow in the brain to see which parts of the brain are activated when performing certain activities. After the brain is affected by trauma caused by a disease such as an injury or stroke, it is important to know if the brain is functioning as expected. It can also detect if the tumor is blocking blood flow to the brain. These tests are important for planning appropriate treatment for any condition that affects the brain.

What are the risks of MRI?

Obtaining an MRI is a relatively safe option. In fact, this is one of the safest imaging tests available. That said, testing people in certain conditions carries certain risks. Women in early pregnancy should avoid getting an MRI because the foetation is in the process of developing organs.

Some MRI scans use contrast media to improve the image. However, few people are allergic to dyes. If you have allergies, please contact your doctor and laboratory technician in advance. This type of MRI should also not be given to people with advanced kidney disease.

MRI is not prescribed for patients with the following conditions:

  • Patients using a pacemaker or defibrillator. However, MRI-compatible pacemakers are currently available.
  • People with cochlear implants

How do I prepare for an MRI?

Your doctor will ask you for a complete medical history before prescribing an MRI scan. In either case, you need to be notified of any of the following conditions:

  • Kidney or liver disease
  • Recent surgery
  • Food or medical allergies or asthma
  • pregnancy

MRI machines are large and powerful magnets in nature, so no metal can be placed in the imaging chamber. You should notify your doctor if you have any of the following:

  • Cochlear implant
  • Body piercing
  • Drag pump
  • Insulin pump
  • Embedded nerve stimulator
  • Artificial heart valve
  • Pacemaker or defibrillator
  • piece of metal
  • Pins or screws used in surgery
  • Metal joints or limbs
  • Metal filling in dental treatment
  • tattoo

On the day of the MRI scan, wear loose and comfortable clothing without metal zippers or clasps. You may be asked to wear a hospital gown instead of your own clothes for testing.

Here’s a checklist of all the items you should not bring into the imaging room:

  • mobile phone
  • Dentures
  • glasses
  • coin
  • Wire bra
  • Key
  • to see

What does an MRI machine look like?

There are two types of MRI equipment, closed type and open type. The closed type is the most commonly used MRI machine. It is a large cylindrical machine with a table in the center. You will be asked to lie down on the table and the part of the body to be scanned will be placed inside the cylinder. The cylinder contains magnets that form the core technology of the MRI machine. When the machine scans your body, you need to be completely stationary. Otherwise, the generated image will be blurry.

Open-type MRI machines are used for patients who are unable to fit the general type or who have claustrophobia and cannot stay in the device for extended periods of time. However, it is important to note that open MRI machines do not produce as high quality images as regular closed MRI machines.


MRI is used for a variety of reasons, including diagnosing a disease and checking if the body is responding to treatment. It is one of the safest imaging tools available in the medical industry. MRI measurements can be read by a professional radiologist. If you are asked to get an MRI, go to a reputable hospital or diagnostic lab for an examination.

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Frequently Asked Questions (FAQ)

1.1. What happens during an MRI?

An MRI scan can take 20-90 minutes, depending on the part of the body that needs to be scanned. Depending on the scan, contrast may or may not be injected. The machine makes a loud loud noise that you can ask for earplugs.

2.. Is it possible to go home immediately after an MRI?

It is okay to leave the diagnostic lab immediately after MRI. If you are given medicine to help you relax during the scan, you should ask someone to drive home.

3.3. Are there any side effects of getting an MRI scan?

Some people may be allergic to the contrast media used in MRI scans. However, this is very rare and your doctor will make sure you are not allergic before scanning. reference:

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