| 摘要 |
PURPOSE:To display blood flow movement three-dimensionally and to obtain good ultrasonic diagnostic data by calculating the speed component in an ultrasonic beam direction on the basis of the max. value of an autocorrelation function by a cross-correlation method and calculating the speed component in the direction crossing the beam direction at a right angle on the basis of a change of the max. value with the elapse of time. CONSTITUTION:An annular probe 1 is applied to the region to be observed of a living body and the ultrasonic pulse from an ultrasonic transmission circuit 2 is transmitted from the probe 1. The ultrasonic pulse receives Doppler deflection to be received by an ultrasonic receiving circuit 3 and the signal inputted to a B-mode detection part 5 is subjected to envelope detection to be inputted to a display part 9 as white and black data. The echo signal inputted to a cross-correlation operation part 4 is subjected to phase detection to be analyzed in its frequency and a dispersion value sigma of Doppler deflection and blood flow power P are obtained and blood flow velocity Vz is measured to be outputted to an absolute flow velocity operation part 8. Velocity Vxy is measured by an x-y direction flow velocity operation part 7. The Vz component inputted to the absolute flow velocity operation part 8 and the x-y direction velocity component from the x-y direction velocity operation part 7 are synthesized and the synthetic speed is displayed on the display part 9 and three-dimensional absolute blood flow data can be obtained. |
