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Ultrasonically induced gas bubbles on the surface of SOAB rubber: the consequence for measurement of power output from ultrasonic instruments

SOAB rubber has been used as the absorbing target for measuring the total power outputs from medical ultrasonic instruments. The studies described show that ultrasound irradiation from a therapeutic instrument can generate significant temperature rises inside SOAB rubber and cause gas bubbles to form on its surface. The temperature rise is believed to be responsible for the formation of gas bubbles. The likely effects of these gas bubbles on the accuracy of measurement of power output are discussed.