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A physical therapist uses therapeutic ultrasound for deep heating of the left piriformis muscle prior to soft tissue mobilization and stretching. Which of the following would be the MOST appropriate treatment parameters?1.3 MHz, 1.0 W/cm2, 100% duty cycle, for 12 minutes2.1 MHz, 1.0 W/cm2, 100% duty cycle, for 12 minutes3.3 MHz, 1.5 W/cm2, 100% duty cycle, for 8 minutes4.1 MHz, 1.5 W/cm2, 100% duty cycle, for 8 minutes
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