Research On Acoustic Parameter Detection Technology Of High Intensity Focused Ultrasound

High Intensity Focused Ultrasound(HIFU)has achieved breakthrough development in the field of medical ultrasound due to its minimally invasive and even non-invasive characteristics.However,the measurement of HIFU indicators is still in the laboratory method stage currently,and there is a lack of methods and devices that can be applied to multi-index detection at medical sites.To this end,this paper cites near-field cross-spectrum methods.The characteristics of HIFU ultrasound field are analyzed,a portable detection device for the scene is developed and the research of HIFU acoustic parameter detection technology is carried out.The main contents include:The development status of HIFU and acoustic parameter detection at home and abroad are reviewed.The detection method of near-field cross-spectrum measurement is introduced.The basic nonlinear acoustic equation and the second-order nonlinear acoustic wave equation Westervelt equation are calculated and derived.The simulation of HIFU ultrasound field was performed in COMSOL finite element software.The characteristics and propagation law of the HIFU were studied.The influence of nonlinear harmonics on acoustic parameter detection was obtained,and a nonlinear energy compensation correction for the measurement method was proposed.According to the needs for on-site testing of HIFU medical equipment,a portable detection device including mechanical hardware structure design,motion control and acquisition module design and key component selection was developed,The host computer software was developed on the Lab VIEW platform.The experimental study of HIFU acoustic parameter detection which using two HIFU probes with a center frequency of 1.065 MHz as the test object was conducted and the uncertainty evaluation of the device was performed.The results show that the portable detection device which can realize the detection of sound pressure,sound intensity,acoustic power and sound focal range of HIFU meets the design indicators and the requirements of on-site detection for HIFU acoustic parameter.At the same time,the result of the acoustic power range from 0W to 60 W is compared with the radiation force balance method which shows that the two methods have good consistency.Therefore,it shows that the measuring device has strong stability and can realize the acoustic parameter detection work in the medical site.