Magnetic resonance imaging (MRI) is a type of scan that is often used to diagnose health conditions that affect organs, tissue and bone.
MRI scans use strong magnetic fields and radio waves to produce a detailed image of the inside of the body. The device that carries out MRI scans is known as an MRI scanner. The scanner consists of a large tube that contains a series of powerful magnets. The patient lies inside the tube during the scan.
History
The scientific principles behind MRI were discovered in 1946, but it was not until the 1970s that the technology became available to use these principles.
At first, most MRI scanners were only available at large research centres. However, as the price of the scanners decreased, they started to become more widely available and now many NHS hospitals offer MRI facilities.
Safety
One of the main advantages of MRI is that, unlike X-rays, it does not involve exposing the body to radiation.
Extensive research has also been conducted into whether the magnetic and radio waves that are used in MRI could pose a risk to the human body. No evidence that there is a risk has ever been found. This means that MRI is one of the safest medical procedures currently available.
Glossary
MRI
MRI stands for magnetic resonance imaging. It is the use of magnets and radio waves to take detailed pictures of the inside of the body.
Joints
Joints are the connection point between two bones that allow movement.
Bone marrow
Bone marrow is the soft, spongy tissue in the centre of bones that produces blood cells.
Blood vessels
Blood vessels are the tubes in which blood travels to and from parts of the body. The three main types of blood vessels are veins, arteries and capillaries.
Structures
Structure is the way something is put together and how its different parts relate to each other.
Brain
The brain controls thought, memory and emotion. It also sends messages to the body controlling movement, speech and senses.
Spine
The spine supports the skeleton and surrounds and protects the delicate spinal cord and nerves. It is made up of 33 bones called the vertebrae.
Abdomen
The abdomen is the part of the body between the chest and the hips.
