| 摘要 |
<p>A portable ultrasonic diagnostic instrument including an array transducer (1), a beam former (3), signal processing, imaging circuitry (4), and a display (5) for the processed echo signals operates on no more than 25 watts of electrical power. Circuit functions can be select attend depending on mode of operation of the instrument to thereby reduce power consumption. Further, a power monitor and control (6) can monitor electrical current from a battery power source. When power consumption reaches a predetermined level the power monitor and control further alters one or more functional units in the instrument including display mode of operation, clock frequency for analog to digital conversion, signal processing, color signal processing, and 3D signal processing. Power consumption can be monitored against two or more predetermined levels wherein instrument functional units or mode of operation are altered depending on which level of power consumption has been reached. In an instrument with an analog beam former, power consumption can be limited to 10 watts, whereas in a digital beam former instrument power consumption can be limited to no more than 25 watts.</p> |
