Measuring Temperature Rise in Phantom to Determine High Power High-Intensity Focused Ultrasound Sound Field

To investigate high-power High-Intensity Focused Ultrasound (HIFU) generated acoustic field and the characteristic and significance of the method of acoustic field measurement. In this paper, thermocouple measurements of HIFU using power of 40W, 70W, 100W, 150W and 200W. The irradiation time at the phantom focal region was 1 second for temperature field distribution. The relationship between instantaneous temperature rise and the acoustic intensity was used to determine HIFU acoustic field distribution. The results showed that, as the acoustic power increases, the radius of the focal region gradually grows toward the width of -6dB; the focal region is widest when the acoustic power is 100W. The focal plane area and acoustic surface area increases with the increase in power. The use of thermocouples to measure the instantaneous temperature rise in the phantom focal region to describe the high-intensity acoustic field distribution of HIFU is a feasible method.