Magnetic resonance imaging is a medical imaging technique used in radiology to form pictures of the anatomy and the physiological processes of the body. MRI scanners use strong magnetic fields, magnetic field gradients, and radio waves to generate images of the organs in the body.
MRI is a test that uses powerful magnets, radio waves, and a computer to make detailed pictures inside your body.
How does MRI machine work?
The MRI scanner is a tube surrounded by a giant circular magnet. The patient is placed on a moveable bed that is inserted into the attraction. The magnet creates a strong magnetic field that aligns the protons of hydrogen atoms, which are then exposed to a beam of radio waves. This spins the various protons of the body, and they produce a faint signal that is detected by the receiver portion of the MRI scanner. A computer processes the receiver information, which provides an image.
Need to Get an MRI?
An MRI (magnetic resonance imaging) lets the doctor see the organs, bones, and tissues inside the body without having to do surgery. This test can help diagnose a disease or injury. A patient might need an MRI if an X-ray or CT scan is unable to give enough information about the severity of the illness, .and also helps in monitoring the response to treatment.
MRI image and resolution is quite detailed, and it can detect tiny changes of structures within the body. For some procedures, contrast agents, such as gadolinium, are used to increase the accuracy of the images.
Advantages of using MRI :
MRIs can be done in different parts of the body. It’s especially useful for looking at soft tissues and the nervous system. MRI scan helps to detect problems in the tense, thoracic, and the pelvic regions of the body.
An MRI of the brain and spinal cord looks for:
Blood vessel damage
Spinal cord injuries
An MRI of the heart and blood vessels looks for:
Blocked blood vessels
Damage caused by a heart attack
Problems with the structure of the heart
An MRI of the bones and joints looks for:
Damage to joints
Disc problems in the spine
Neck or low back pain with nerve signs
MRI scan can also be done to check the health of these organs:
A special kind of MRI scan called a functional MRI (fMRI) maps brain activity.
This test looks at blood flow in your brain to see which areas become active when you do specific tasks. An fMRI scan detects brain problems, such as the effects of a stroke, or for brain mapping if you need brain surgery for epilepsy or tumors. The doctor can use this test to plan treatment.
MRI scanning is painless and does not involve x-ray radiation.
Patients with heart pacemakers, metal implants, or metal chips or clips in or around the eyes cannot be scanned with MRI because of the magnetic field.