| 摘要 |
<p>A method for assessing and displaying the true three dimensional magnitude of fluid velocity using ultrasonic imaging signals is disclosed. Fluid (12), such as blood, flowing through a vessel (10) is subjected to ultrasound imaging signals using a transducer (16). Axial velocity of fluid motion in relation to the transducer beam (14) is then determined from the imaging signals. Next, a region of laminar flow is identified using the axial velocity. Lateral transit time in the region of laminar flow is then estimated as an indication of velocity in the direction perpendicular to the transducer beam. The three-dimensional velocity magnitude is then estimated using the lateral transit time and the total distance across the lateral beam width, or by using the beam to vessel angle (22) which is estimated using the lateral transit time. The estimated three-dimensional velocity is then displayed as a numerical representaion or as an image as a two-dimensional waveform as a function of time or as a color flow map where the velocity magnitude is represented by different colors and/or intensity of color.</p> |
