2. PRBSWA section to interface with

2. PRBSW
A section to interface with the probe, which corresponds to the transmitter/receiver
of ultrasound scanner.
PRBSW gives high voltage pulse to the transducer for driving it, as well as amplifies
echo returned from body tissue.
Also, PRBSW is composed of the following two boards:
(1) PRB PCB
(2) AWP PCB
3. DBF
Outputs transmit signals delayed for each channel to PRBSW PCB, beam-forms the
received wave signals and sums for channels, and outputs it to DVP PCB.
4. DVP
Processes each beam-formed signal of B, M, D and CFM mode from DBF, and
outputs to BWDSC and DOP.
5. DCSP
Composed of DOP unit and CFM unit.
(1) DOP unit
Utilizes the FFT method to perform frequency analysis of Doppler signal at free
depth of pulsed Doppler receive signal demodulated on DVP PCB and
continuous Doppler signal demodulated on CW PCB and outputs analysis data
to BWDSC PCB. Also it separates the forward and reverse Doppler signals
and outputs them to the loud speaker.
(2) CFM unit
Thins out the demodulated signals for CMF that is the output of DVP PCB
down to the number of data to be calculated by DSP, and calculates blood
velocity, flow velocity variance and flow reflection intensity.
Further, it interpolates this calculated output in the scan line direction to
suppress CFM artifacts and outputs the result to the CFMDSC PCB.
6. BW’DSC
After applying smoothing, enhancement and so on to image data from DVP, DCSP,
CFMDSC and Digital Capture Card, it converts them to TV synchronized signals to
output them to the Video Board together with ECG and heart sounds waveform data
from BIO PCB.
7. CFMDSC
Applies frame correlation process and smoothing process to flow velocity, flow
variance and flow reflection intensity outputted from the DCSP PCB, and converts
the results from ultrasound scan (R, 8 ) to TV scan (x, y> to output to the BWDSC
PCB.