Which option is a method to reduce tissue heating during ultrasound?

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Multiple Choice

Which option is a method to reduce tissue heating during ultrasound?

Explanation:
Pulsing the ultrasound limits the time tissue is exposed and allows cooling between bursts, which lowers heating. Heating from ultrasound depends on the average energy delivered over time; when the beam is on only part of the time, the off periods let tissue dissipate heat, reducing the temperature rise. Using pulsed ultrasound lowers the temporal-average intensity, so tissue heating is minimized. Increasing the duty cycle, using higher intensity, or delivering ultrasound continuously would all raise the energy delivered over time and increase heating.

Pulsing the ultrasound limits the time tissue is exposed and allows cooling between bursts, which lowers heating. Heating from ultrasound depends on the average energy delivered over time; when the beam is on only part of the time, the off periods let tissue dissipate heat, reducing the temperature rise. Using pulsed ultrasound lowers the temporal-average intensity, so tissue heating is minimized.

Increasing the duty cycle, using higher intensity, or delivering ultrasound continuously would all raise the energy delivered over time and increase heating.

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