Design of a gain compensating circuit for medical ultrasonic system / 中国组织工程研究

ABSTRACT

BACKGROUND: To make the echo signals reflected by interface with different depth and same property display the same amplitude,amplifier gain much be gradually increased based on depth(time),and the situation that weak long-distance reflected wave caused by ultrasonic wave in the ultrasonic transmission attenuation process must be compensated.OBJECTIVE: To compensate the propagation attenuation of the echo signal in the medical ultrasonic system,a time gain compensating(TGC)circuit design scheme is presented,and the design basis and principles of the circuit are briefly introduced.METHODS: Aiming to the medical ultrasound system features,the variable gain amplifier parts VCA610 with high SNR,high-bandwidth were chosen to realize the ultrasonic gain compensation circuit.RESULTS and CONCLUSION: The design effectively solved the non-linear compensation of echo signals caused by echo distance in the medical ultrasound soft tissue measurement.Compared with traditional discrete components circuit,the scheme had the characteristics of simple circuit,stable and reliable TGC control signal,and flexible adjustment,etc.It can accurately compensate the attenuation of ultrasound in the human body,thus,provides a new and reliable method for the medical measurement system design.