Understanding How MRI Scanners Work for Knee Imaging

An MRI (Magnetic Resonance Imaging) machine is a donut-shaped device that uses strong magnetic fields and radio waves to generate detailed images of body structures, such as the knee. These scans are valuable for identifying pain, swelling, or inflammation in the knee joint. Unlike X-rays, MRIs do not utilize ionizing radiation, making them a safer choice for detailed internal imaging and helping determine if surgical intervention is needed.

Preparing for a Knee MRI

• Patients may be asked to wear a loose gown or clothing without metal fasteners during the scan.
• In some cases, contrast agents administered intravenously enhance image clarity, especially for detailed examination of knee tissues.

The radiologist may inquire about allergies before administering contrast substances. For those allergic to iodine, gadolinium might be used as an alternative contrast agent, requiring patient consent.

How MRI Works

The MRI scanner sends radiofrequency pulses that temporarily realign hydrogen atoms within the body. These atoms emit signals based on their tissue environment, which the machine detects to create detailed images. These images can be viewed from various angles, helping identify abnormalities with higher contrast compared to other imaging techniques.

The entire knee MRI procedure can take between 15 to 45 minutes, depending on the complexity. Patients are positioned on a movable table, with straps used to keep the knee steady. Small radio wave emitters are placed near the knee to improve image quality. Most scans are non-invasive and painless, though some patients may feel discomfort or claustrophobia, for which sedation can be arranged.

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