What is the maximum SAR limit for whole-body exposure recommended by the FDA?

The correct response regarding the maximum specific absorption rate (SAR) limit for whole-body exposure as recommended by the FDA is 0.4 W/kg. This limit is set to ensure that exposure to magnetic resonance imaging (MRI) does not result in harmful thermal effects on the body due to the radiofrequency energy that is absorbed. The FDA guidelines are designed to maintain safety and protect patients from potential adverse effects associated with excessive heating during MRI procedures.

Maintaining exposure levels below this threshold ensures that the risk of tissue damage is minimized while still allowing for effective imaging capabilities. This standard is part of the safety measures that healthcare practitioners and facilities must adhere to when using MRI technology for diagnostic purposes.