A6T/A6/A5 Portable Ultrasonic Diagnostic System
4701-0040-01A
2-9
According to the design, the Digital Beam Former sends out transmit pulse
signals at a certain frequency. Going through signal driving and logic switch,
the signals are sent to the elements of the transducer. With the oscillation of
element, ultrasonic waves are generated. The combinations of many element
signals enable the transducer to send out a dynamic directional compounded
beam. Then the beam is propogated and attenuated in the human body.
When the echo returned to the element crystal, it will be changed to electric
signals again. Being amplified by the pre-amplifier, the signals are sent for
A/D conversion, through which analog signals are converted to digital signals,
compounded in the beam former, go through digital signal processing such as
filtering, logarithm compression, detection and form digital beam data stream.
The beam data steam is sent to the CPU board goes through scan transform
and video processing. Finally, an ultrasonic image is displayed on the monitor.
The core of the CPU board is a built-in Linux system. In addition to completing
display of ultrasonic images, it accepts keyboard operation commands from
the user, and changes them to internal executable commands. Moreover, it
will achieve all kinds of measurement and calculation, data input and output of
peripheral ports, and so on. The system can also work with peripheral devices
such as a printer, a network device or an external memory, so as to extend
system functions.
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