| 摘要 |
An ultrasound imaging method includes the step of transmitting two ultrasonic transmit pulses into a region. First components of the transmit pulses are inverted with respect to each other while second components of the transmit pulses are not. Received ultrasound pulses associated with the transmit pulses are summed to selectively cancel the harmonic or fundamental components. By properly selecting the inverted and noninverted portions of the transmit pulses, the transmit pulses may be made unipolar, or they may be pre-distorted to further reduce second harmonic energy associated with system or tissue non-linearities. |
