| 摘要 |
<p>This invention presents a multi-beam base band processor (R-125) for making post-beam formation adjustments to the complex (imphase/quadrature) pre-detection scan line samples acquired from a receive beam former (R-100) of an ultrasound imaging system (R-20). Specifically, the invention includes a programmable finite impulse response (FIR) filter and a programmable complex multiplier. The programmable filter performs signal shaping and sample rate conversion. The signal shaping capability may be used to compensate for transducer and analog signal path responses, to increase signal to noise ratio (SNR) by rejecting out of band noise frequencies, to operate as a matched filter to the transmitted waveform shape, and to act as both a smoothing and anti-alias filter during rate conversion operation. The programmable multiplier permits both amplitude and phase adjustments of the complex data that assures amplitude and phase coherency between acquired scan lines, compensating for the effects of a selected scan format or the differences in ultrasound frequencies used to produce each scan line.</p> |
