![]() They may also cause peripheral muscle or nerve stimulation that may feel like a twitching sensation. The magnetic fields that change with time create loud knocking noises which may harm hearing if adequate ear protection is not used.Careful screening of people and objects entering the MR environment is critical to ensure nothing enters the magnet area that may become a projectile. The strong, static magnetic field will attract magnetic objects (from small items such as keys and cell phones, to large, heavy items such as oxygen tanks and floor buffers) and may cause damage to the scanner or injury to the patient or medical professionals if those objects become projectiles.But while there are no known health hazards from temporary exposure to the MR environment, the MR environment involves a strong, static magnetic field, a magnetic field that changes with time (pulsed gradient field), and radiofrequency energy, each of which carry specific safety concerns: MR images are made without using any ionizing radiation, so patients are not exposed to the harmful effects of ionizing radiation. ![]() ![]() These images provide information to physicians and can be useful in diagnosing a wide variety of diseases and conditions. MRI provides better soft tissue contrast than CT and can differentiate better between fat, water, muscle, and other soft tissue than CT (CT is usually better at imaging bones). An MRI scanner can be used to take images of any part of the body (e.g., head, joints, abdomen, legs, etc.), in any imaging direction. ![]()
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