Direction separation in Doppler audio of ultrasound diagnosis equipment: Signal processing for Doppler audio dealiasing

Abstract

Medical Doppler ultrasound system has time varying spectrum display and Doppler audio stereo output based on blood flow. We examined the digital signal processing system of Doppler audio from a viewpoint of cost and size reduction. We newly developed the direction separation system of Doppler audio processing interlocking with spectrum Doppler image processing for aliasing. We made the target performance, developed three kinds of signal processing systems, and evaluated each system. Consequently, we could know that the complex IIR filter system was excellent in a response and low calculation load. We confirmed the Doppler audio signal processing for aliasing by simulation and could solve the problem caused by conventional system.