key parameters and control of high focused piezo(二)

The measurement of 250Khz hifu piezo is mainly the focus sound field characteristic - it is the focusing parameter. Because ultrasonic waves are prone to cavitation and nonlinear effects under water and human tissues, it is unpredictable factors, especially the focused sound field characteristics of high-power HIFU ultrasound piezo ceramic in the sound field of water and tissue are different from the focused sound field characteristics of the ideal sound field. Therefore, the measurement of the focused ultrasound and its sound field characteristics is much more difficult than that of the ultrasound diagnostic apparatus. It has passed the review of the national standard for high-intensity focused ultrasound therapy systems "industry standards and acoustic high-intensity focused ultrasound sound power and sound field characteristics". The basic ideas and practices of these two standards for focusing sound field characteristics and ultrasonic power measurement basins, Under the low power conditions (10% to 20% of full power output)