What is the potential tissue temperature rise associated with 240 W-min/kg?

The correct answer is associated with understanding the specific absorption rate (SAR) in magnetic resonance imaging (MRI) and its relationship to tissue temperature rise. A SAR of 240 W-min/kg indicates the amount of energy absorbed per kilogram of tissue over a period of time.

This energy absorption ultimately leads to an increase in tissue temperature. The average tissue temperature rise can be calculated based on established models relating SAR values to expected temperature increases. A SAR of 240 W-min/kg is significant enough to elevate the temperature to around 43°C, which is a key temperature threshold in MRI safety considerations. This temperature is important for assessing the risk of thermal injury to tissues during MRI scans.

Tissue temperatures above the normal body temperature (which is approximately 37°C) can lead to physiological responses, and temperature increases above approximately 40°C can increase the risk of thermal damage. Therefore, knowing that a SAR of 240 W-min/kg is sometimes associated with a maximum tissue temperature rise approaching that 43°C level is critical for MRI safety protocols.

This understanding emphasizes the importance of monitoring SAR levels during MRI procedures to prevent overheating and ensure patient safety.