Principle

To take an MRI image, the patient lies on a movable bed. The bed enters a strong magnetic field and then a second magnetic field is applied for a short time in a different direction. This sudden shift causes certain atoms in the patient's body make special signals. The MRI scanner detects those special signals. The MRI scanner then sends the signal information to a computer, and the computer creates an image of the inner body by using the signal information.

Pros and Cons

The MRI is used to diagnose disorders of the body that cannot be seen by X-rays. The MRI is painless and has the advantage of avoiding X-ray radiation exposure. It is an expensive medical procedure to have. A person who has metallic objects or implants in the body cannot generally have an MRI.

Where to use?

The MRI is also used to study nerves, muscles, bones, and many other tissues in the body. MRI are very useful for finding blood clots.

When to use?

An MRI scan can be used as an extremely accurate method of disease detection throughout the body.

Neurosurgeons use an MRI scan not only in defining brain anatomy but in evaluating the integrity of the spinal cord after trauma. An MRI scan can evaluate the structure of the heart and aorta, where it can detect aneurysms or tears.

It provides valuable information on glands and organs within the abdomen, and accurate information about the structure of the joints, soft tissues, and bones of the body.

Exercise: a) Read the text:

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<== попередня сторінка	\|	наступна сторінка ==>
B. Magnetic Resonance Imaging	\|	Magnetic Resonance Imaging (MRI)

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