Research On Ultrasound Detection System For Bladder Volume Measurement

In China,many people are suffering from urinary system diseases.the prevalence of urinary system is 33.4%,and the mortality rate is 1.39%.Bladder residual urine volume is regarded as one of the important indicators for the diagnosis and treatment of urinary system diseases.At present,there are many methods to detect residual urine in bladder.However,these methods have many disadvantages.The magnetic resonance imaging examination is expensive and the inspection duration is long.The implantable sensor has poor biocompatibility and low sensitivity.Electrical impedance method has more reliable electrical contact with the skin and more factors leading to impedance changes.To address these issues,the researchers focused on ultrasound imaging systems to measure bladder volume.Due to their non-invasive,non-radiative and repeatable scanning advantages,ultrasound imaging systems are widely used for medical examinations.However,there are still many problems with current ultrasound imaging methods,such as the complexity of the imaging system algorithm,resulting in long measurement time;low spatial resolution,resulting in unclear imaging and affecting measurement results.In this thesis,we develop an ultrasonic bladder volume detection technique without imaging.To begin with,a new bladder volume measurement algorithm,"three-point positioning" algorithm,is proposed to measure the bladder volume.Next,a new type of ultrasonic probe structure,"three-element" ultrasonic probe,was designed to realize three-direction transmission and reception of ultrasonic waves.Finally,in order to improve the volumetric measurement efficiency,the existing ultrasonic echo signal processing algorithm is optimized,and the envelope of the ultrasonic signal is extracted by the Hilbert demodulation algorithm.Experimental results show that the ultrasonic detection system measurement time is less than 5s,and the relative error rate of the measurement results is less than 10%.The promising results indicate that this system is beneficial for the patients with urinary system diseases.