Understanding How an MRI Scanner Works
Discover how MRI scanners work and their role in diagnosing knee issues. Learn about preparation steps, the scanning process, and what to expect during the procedure. MRI's safety and detailed imaging make it a preferred choice for internal body examinations, especially for detecting abnormalities and guiding treatment decisions.
Understanding the Operation of an MRI Machine
Magnetic Resonance Imaging (MRI) is a non-invasive diagnostic tool that uses strong magnetic fields and radio waves to create detailed images of the body's internal structures, such as the knee. This imaging technique aids in evaluating pain, swelling, or inflammation and helps determine if surgery is necessary. MRI does not involve ionizing radiation, making it a safe option for many patients.
Preparing for a Knee MRI
Wear loose, metal-free clothing or a gown as directed by your doctor.
Contrast agents may be administered intravenously to enhance image clarity.
Inform your healthcare provider about allergies, particularly to iodine or gadolinium, as contrast agents may be used with patient consent.
How an MRI Scanner Works
The MRI machine uses radiofrequency pulses to realign hydrogen atoms in the body without causing chemical changes. These atoms emit signals that vary depending on tissue type. The scanner detects these signals to generate detailed images of internal structures.
These images can be viewed from multiple angles, assisting in identifying abnormalities. MRI provides superior contrast between normal and abnormal tissues compared to other imaging methods.
The Knee MRI Procedure
Depending on injury severity, the procedure may be performed on inpatients or outpatients. The patient lies on a movable table, with straps used to stabilize the knee. Small radio wave receivers near the knee improve image quality. The entire process lasts approximately 15 to 45 minutes.
Most MRI scans are painless. Some patients, especially those with claustrophobia, may experience discomfort and may require sedation.
