Radiofrequency Fields - Video Lesson

Hey, everybody. Welcome back. In this lesson, we'll discuss radio frequency or RF fields in MRI. We'll discuss key safety hazards, the different operating modes of MRI scanners, and how to reduce RF deposition. RF deposition or radio frequency deposition refers to the process by which RF energy is absorbed by tissues in the body during an MRI scan. This absorption of energy can lead to an increase in the temperature of the tissues, a phenomenon known as thermal heating. The amount of RF energy absorbed is quantified by the specific absorption rate or SAR, which measures the rate at which energy is deposited per unit mass of tissue, usually expressed in watts per kilogram. SAR is calculated by the scanner based on the patient's body weight. This is why it is extremely important to have an accurate weight when entering patient information at the control panel. Managing RF deposition is crucial for patients.