Acoustical Nonlinear Parameter and Sound Speed Characteristics of Human Fat Tissues

Quantitative analysis of temperature dependent acoustic trapping characteristics by using concentric annular type dual element ultrasonic transducer

“…The above relation between speed and ambient temperature is analogous to that of a previous experimental study regarding the temperature variation of ultrasound velocity in liver and fatty tissue, where the velocity decreases for fatty specimens but increases for non-fatty tissues with temperature rise [11,12]. Another study also revealed that the sound speed for human fat tissues decreases with a rate of 2.7 m/s/°C from 1474.2 ± 7.8 m/s to 1427.8 ± 12.7 m/s in the range of 20-37°C [13]. In particular, it was shown that the sound speed in non-fatty breast tissue linearly increases from 1540 m/s to 1580 m/s through 23°C to 43°C.…”