| 摘要 |
<p>A transmitter-receiver device for an ultrasonic imaging unit for producing cross-sectional images of a body, the said unit operating by the pulse echo method and comprising the following means: an array of transducer elements which are disposed side by side and which in response to transmission signals fed to the transducer elements directs ultrasonic pulses into the body along a plurality of beams, receives echoes of these pulses reflected by irregularities of the acoustical resistance within the body, and generates electrical echo signals in response to the received echoes and first electrical connecting means for transmitting the transmission and the echo signals between the transducer elements and electrical connections in the transmitter -receiver device, said connecting means either being in the form of permanent connections or connections which are adapted to be established in response to first control signals. To enable different scanning processes to be carried out with substantially one and the same ultrasonic imaging unit and at the same time enable high-quality images to be produced, the transmitter-receiver device contains the following: a transmission signal generator which in response to second control signals delivers by way of a plurality of outputs groups of selected transmission signals having predetermined positions in time, one transmission signal being delivered via one output in each case; an echo signal processing circuit having plurality of inputs and containing first variable delay means by means of which the echo signals reaching the inputs of the echo signal processing circuit can be selectively delayed in response to third control signals; an array of lines each connecting one output of the transmission signal generator to one input of the echo signal processing circuit; signal transmission means inserted between the array of lines and the first electrical connecting means, said signal transmission means containing second variable delay means by means of which the transmission signals and the echo signals can be selectively delayed in response to fourth control signals, and second electrical connecting means by means of which the transmission signal generator, the first and the second delay means and, as required, the first electrical connecting means are adapted to be connected to a control circuit delivering the second, third, fourth and, if required, the first control signals. Fig. 1</p> |
