The Study On The Measurement And Comprehensive Analysis System For Ultrasound Field Based On A Precise Robot

Biomedical ultrasound engineering is combined with ultrasound technology and medical applications, using the ultrasound as a non-invasive treatment. Medical ultrasonic transducers, which characteristics of frequency and radiation field are the assessment in treatment. The important parameters of designing ultrasonic transducer, to researchers and users, is the key technology in this filed. Therefore, in order to adapt to design and meet requirements of the evaluation for complex ultrasonic transducer, a precision robotic measurement system and comprehensive analysis systems was developed in the paper, to overcome the difficulties in the actual measurement for the complex ultrasonic field.The system includes three parts, such as the mechanical, hardware and software components. Precision four-axis robot driven with stepper motor assembly was used to locate hydrophone sensor to receive ultrasonic signal in water tank. Through the fast and efficient data acquisition module, the real-time data of three-dimensional ultrasound field were displayed and recorded using software system. The entire software platform of the system with a good interactive interface can communicate with hardware in real-time between the robot and the control platform, to achieve coordination between the control and data acquisition, and show a good visual results, to facilitate assessing the features of ultrasonic transducer. Actual measurement results show that the system has characteristics of high spatial resolution and frequency response to meet the accuracy and reliability of the ultrasound field measurement.In this paper, the characteristics of ultrasound field distribution and frequency for self-focusing concave shaped ultrasonic transducer was studied as the validation of system function, and the factors of the transducers, the media and the parameters of ultrasound filed was analyzed. The research results show that the geometry factors of concave spherical transducer could affect the long axis and short axis and the sound pressure distribution in focal areas. Comparing repeated measuring data with the values from geometric acoustics field model, the experimental results show that the model of focused ultrasound field can be used for the measurement and modeling ultrasound field. The focal size of single frequency transducer has some restrictions. In medical applications because of the complexity of biological tissue, single frequency transducers are often unable to meet the applications, and need to design multi-frequency and ultrasonic transducer with complex field feature. The research results of this paper have important reference value for the theoretical research on ultrasound, clinical treatment, and providing an effective way to model biological effects in human tissue. According to ultrasonic theory, the parameters of the ultrasound pressure field in core frequency and the transducer of Extracorporeal Focused Shock Wave Therapy (EFSWT) are measured, and a model based on the ultrasound field has been developed and simulated with measured data. The results suggest the model has good performances to analyze and model EFSWT, and is helpful to design transducer parameters, and model them to estimate effect in tissue treatment in the future clinical researches.