The Research Of The Measurement Of Ultrasonic Velocity Based On The Quantitative Ultrasound Technology

Osteoporosis (OP) is a great healthy problem in an aging society, and studies on its diagnosis are getting popular these days. Among all related studies, it is fundamental to find new parameters for assessment of cancellous bone and osteoporosis diagnosis. Quantitative ultrasound (QUS) measurement is a new method to measure the bone, and it has played a growing role in the assessment of skeletal status. Compared to conventional X-ray techniques, QUS is inexpensive, noninvasive, nonradioactive and easy to use. In the aspect of clinical application, Ultrasonic Transmission Technique is typically used. However, methods based on ultrasonic reflection have gained more and more attention during the past few years. Such approaches use setups where emission and receiving transducers are place at the same side of the subject and measure the reflected ultrasonic wave, which is further used to evaluate the bone's status. This technique is more and more commonly used, due to ease of operations.Our research aims at developing a novel method based on the theory of lateral wave and critical angle, with lower measurement error, further simplified operations and better performance in common environment. Specifically, our subject has made some meaningful work in the following aspects:1. We discuss the current state-of-the-art methods for measuring SOS and analyze the factors affecting the measurement accuracy.2.Through studies of current state-of-the-art methods for measuring SOS, we propose a novel approach that is more suitable in common environment.A new parameter is introduced, through which interferences of skin and other tissues that occur in typical methods are suppressed; and in conjunction with polynomial fitting enable achieving high measurement accuracy.3. Our method improves measurement accuracy, by applying polynomial fitting on observed waves.