3D ellipsoidal backprojection images from large arrays. II

For pt.I see Medical Imaging VI: Instrumentation, SPIE vol.1651 (1992). Ellipsoidal backprojection imaging allows 3D ultrasonic images to be obtained in real time, i.e., at 30 frame/s. In doing this, it overcomes a fundamental limitation of conventional focused beam imaging. High-quality ellipsoidal backpropagation images of a point are shown, wherein transmitter and receiver arrays of up to 512 elements are used. A method of synthesizing multiple transmitters using a defocused annular array is described