Evaluation of bone status based on ultrasonic axial transmission technique using empirical mode decomposition and Kalman filter

Ultrasonic axial transmission technique has become one of the most potential methods for measuring bone mineral density because of its advantages of low-cost, no radiation and high precision. According to the ultrasonic axial transmission characteristics, the velocity of the quantitative ultrasound propagating in long bone can evaluate bone status. A system using its own data acquisition module to collect ultrasonic signal is designed in this paper, and DSP is used because of its powerful processing and fast data transmission. At the same time, the empirical mode decomposition and the Kalman filter are combined as the processing method to remove the noise and extract the speed of sound (SOS) with high Precision.