Temperature elevation in tissues generated by finite-amplitude tone bursts of ultrasound

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Abstract
The temperature elevation in tissues generated by an ultrasonic beam of plane sawtooth wave tone bursts along its axis is calculated based on a solution of an extended Burgers'' equation for a medium with loss due to various relaxation processes. The absorption coefficient of the medium is assumed to be proportional to frequency to the b th power (1 .ltoreq. b .ltoreq. 1.4). The results show that when the power generated by a transducer is kept constant, an enhancement of temperature rise in the medium due to narrow- and light-amplitude bursts of ultrasound is evident. For example, if spatial-peak temporal-average intensity, ISPTA = 0.1 W/cm2 = const, the temperature rise generated by sawtooth wave tone bursts with a duty factor of 10-4 (ISPPA = 1000 W/cm2 at the low-loss fluid and tissue interface where the sawtooth wave just forms) is about twice that generated by its corresponding linear continuous wave counterpart.

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