2. The pulser, channels, and summer are all parts of the

3. Filtering, demodulation, and compression are all part of the

4. The scan converter, image memory, and post-processing are all parts of the

5. While most monitors nowadays are flat-screen, the older ones were called C.R.T., which

stands for

6. The pulser, among other things, sets the pulse repetition frequency (P.R.F.). What do you, as

an operator, do to make the pulser change P.R.F.? Is this a direct or reciprocal relationship? How

is P.R.P. affected?

7. What formula can we use to determine the P.R.F. if we know the maximum depth that we're

scanning? What unit is used for P.R.F.? What other formula is this very similar to?

8. What is the main difference between transmit power and gain?

9. Pulse delays are necessary for what two transducer functions?

codes. When

10. Coded excitation works by creating longer than normal pulses made up of sequences of

cycles and partial cycles. These sequences are called coded pulses, or

they come back as echoes, the machine passes them through

them into short pulses with higher

results in a reduction of

than a simple pulse would have given. This

or improved "signal-to-noise" ratio.

and simplifies

11. Which part of the beam former keeps the pulses (to be sent away from the transducer) from

being "heard" by the transducer and sent back to the machine?

12. Data that is in numerical or code form for a computer is called

waveforms (electrical or sound) is called

data.

while live streams of

13. Which part of the beam former is responsible for putting together all the echo data from each

pulse and preparing the scan line?

14. The process of eliminating unwanted background noise by only accepting echoes whose

frequencies fall within the designated bandwidth is called

filter, or

This is

done in which part of the instrument?

15. If our fundamental operating frequency is 5 MHz, but we tell the machine to accept only

echoes in the 9-11 MHz bandwidth, what type of filter are we using?

16. What is another common name for demodulation? What are the 2 steps involved in

demodulation?

17. If the range of amplitudes received is 40 dB, what does this mean in terms of how much

larger the biggest amplitude is compared to the smallest? What would this mean in terms of how

much larger the biggest intensity is compared to the smallest? What would the decibel range of

intensities be in this case?

18. What does the machine do to reduce these enormous ranges into something smaller that

can handle? In which part of the instrument is this done?