Equipment surrounding MRI is made out of plastic instead of metal because *
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Answer:
Magnetic resonance imaging, or MRI, is a way of obtaining detailed images of organs and tissues throughout the body without the need for x-rays or "ionizing" radiation. Instead, MRI uses a powerful magnetic field, radio waves, rapidly changing magnetic fields, and a computer to create images that show whether or not there is an injury, disease process, or abnormal condition present.
For the MRI exam, the patient is placed inside of the MR system or scanner—typically a large donut-shaped device that is open on both ends. The powerful magnetic field aligns atomic particles called protons that exist in most body tissues. The applied radio waves then interact with these protons to produce signals that are picked up by a receiver within the MR scanner. The signals are specially characterized using the rapidly changing magnetic field. With the help of computer processing, images of tissues are created as "slices" that can be viewed in any orientation.
An MRI examination causes no pain, and the electromagnetic fields produce no known tissue damage of any kind. The MR scanner may make loud tapping, knocking, or other noises at times during the procedure. Earplugs are provided to prevent problems that may be associated with this noise. At all times, you will be monitored and you will be able to communicate with the MRI technologist or the MR scanner operator using an intercom system or by other means.
What is MRI used for?
MRI is the preferred procedure for diagnosing a large number of potential problems or abnormal conditions that may affect different parts of the body. In general, MRI creates pictures that can show differences between healthy and unhealthy or abnormal tissues. Physicians use MRI to examine the brain, spine, joints (e.g., knee, shoulder, hip, wrist, and ankle), abdomen, pelvic region, breast, blood vessels, heart and other body parts.
Equipment surrounding MRI is made out of plastic instead of metal because if we place metal objects very close to MRI machine could result dangerous in the air if they fly towards the magnetized machine.
The presence of metals can cause serious problems like:
(1) Magnetic metals can experience a force in the scanner
(2) Long wires (such as in pacemakers) can result in induced currents and heating from the RF magnetic field and
(3) Metals cause the static (B0) magnetic field to be inhomogeneous