ULTRASONIC COLOR DOPPLER DIAGNOSTIC DEVICE AND SIGNAL PROCESSING METHOD FOR ULTRASONIC COLOR DOPPLER IMAGING

摘要

PROBLEM TO BE SOLVED: To surely eliminate clutter components from a practical internal organ with movement by color displaying the information of the blood flow of a cross section based on doppler signals from which the clutter components accompanying the reflection of the ultrasonic wave signals of the internal organ of a testee body are removed by using characteristics decided by the property of the doppler signals. ;SOLUTION: A movement target instruction(MTI) filter part 45 bypass-processes the doppler signals of a real number part and an imaginary number part from which the clutter components are tentatively removed further in a bypass filter 45g and supplies phase inversion signals from a phase inverter 45h to a complex multiplier 45i on the output side of the bypass filter 45g and the phase inverter 45h receives the output signals of a multiplication signal generator 45b, performs a prescribed phase inversion processing and supplies complex signals for which a phase correction amount is turned to an opposite phase to the complex multiplier 45i. The signals of the opposite phase are multiplied in the complex multiplier 45i to the doppler signals from which the clutter components are removed in the bypass filter 45g, the effect of phase correction to the clutter components is canceled and conversion to the signals capable of obtaining a blood flow speed is performed.;COPYRIGHT: (C)1998,JPO