<human>: My doctor says I need to get an MRI. What is an MRI and why is it important?
<bot>: An MRI is a medical imaging technique that uses magnetic fields to visualize the interior of the body. It is used to diagnose many different conditions, including brain tumors, spinal cord injuries, and strokes. An MRI can also be used to evaluate the extent of damage caused by trauma or disease. The images produced by an MRI are very detailed and provide doctors with valuable information about the condition of the patient's body.