Research On The Detection System Of Bone Mineral Density By Quantitative Ultrasound Method Based On DSP

The incidence of osteoporosis is getting higher and higher as our country steps into the aging population society. Osteoporosis can be given timely and symptomatic treatment in early detection by measuring Bone Mineral Density (BMD). Currently, DXA is generally accepted as the best method to diagnose osteoporosis for its high measuring accuracy and wide range of applications, but it has disadvantages of high cost and radiation. Quantitative ultrasound measurement is a new type of method developed in recent years which has advantages of low-cost, portability, non-ionizing radiation, simple operation and high accuracy, etc. Therefore it has become one of the most potential methods for measuring BMD.Broadband Ultrasonic Attenuation (BUA) and Speed of Sound (SOS) are the two important parameters of quantitative ultrasound measurement. According to the osteoporosis diagnosis theory based on quantitative ultrasound technology, we develop a quantitative ultrasound diagnostic system for BUA and SOS combining with modern electronic technology of DSP. Transversal propagation quantitative ultrasonic technology and pulse transmission method are used in the system design. Ultrasound transceiver sensors are designed and manufactured based on the principle of ultrasound sensor. In order to get the maximum efficiency in transmit and receive state, power and impedance matching are studied based on the study of impedance matching principle. In order to improve the performance of the transceiver and data acquisition circuit, we use Pspise to simulate the hardware circuit, so reasonable parameters of the circuit are determined. Digital filtering and cross-correlation processing for the ultrasonic signals through the bone are carried out by DSP based on the simulation, and then the detection of the BUA and SOS is achieved.Through the in vivo detection for 10 people by the designed system, we can see that the estimations of BUA and SOS are reasonable according to the relevant literature, which indicate that the system is effective in detecting quantitative ultrasound parameters. In order to reduce the random error, the arithmetic mean principle is used to deal with measured values of BUA and SOS.