For continuous ultrasound operated underwater, the water should be:

For continuous ultrasound operated underwater, the water should be:

• A. Cold
• B. Warm
• C. Hot
• D. Room temperature

Answer: (B)

Continuous ultrasound used underwater relies on the water to carry and transfer heat to the tissues. When the modality is set for continuous operation, it produces a thermal effect, so the surrounding medium should help deliver heat in a controlled, comfortable way. Warm water—around body temperature or slightly warmer—allows the tissue to absorb heat effectively without rapid cooling or risk of burns. Cold water would carry heat away too quickly and reduce the heating effect, making the treatment less effective and potentially uncomfortable. Room temperature water can cool the tissue and blunt the thermal response, while hot water increases the risk of overheating or superficial burns. So warm water provides the best balance of effective heating and safety for underwater continuous ultrasound.

Continuous ultrasound used underwater relies on the water to carry and transfer heat to the tissues. When the modality is set for continuous operation, it produces a thermal effect, so the surrounding medium should help deliver heat in a controlled, comfortable way. Warm water—around body temperature or slightly warmer—allows the tissue to absorb heat effectively without rapid cooling or risk of burns. Cold water would carry heat away too quickly and reduce the heating effect, making the treatment less effective and potentially uncomfortable. Room temperature water can cool the tissue and blunt the thermal response, while hot water increases the risk of overheating or superficial burns. So warm water provides the best balance of effective heating and safety for underwater continuous ultrasound.