According to the 2003 FDA revision, what is the RF absorption limit for the head?

The correct answer is based on the specific absorption rate (SAR) guidelines established by the FDA regarding the safe levels of radiofrequency (RF) energy exposure, particularly for the head. The FDA's RF absorption limit for the head is set at 3.0 watts per kilogram (W/kg) averaged over a 10-minute period. This regulation aims to protect patients from potential thermal effects due to RF exposure during magnetic resonance imaging (MRI) procedures.

By specifying this limit, the FDA ensures that the energy absorbed by the head during an MRI scan remains within a threshold that is considered safe, minimizing risks such as tissue heating. This established limit helps guide MRI protocols and ensures that the technology is applied without posing significant risk to patients.

Understanding these guidelines is crucial for MRI technologists as they play a vital role in monitoring and managing RF exposure during scans to adhere to safety standards while still obtaining high-quality images.