Question 5: The focus build by the ultrasound probes is done under the___________ principle.
a. Huygens’
b. Ramm and Thurstones’
c. Somers`
d. Gauss`
Question 6: The summation device located after the delay line circuits __________
a. synchronizes the echoes
b. outputs a signal which is representative to the original echo
c. adds the smaller echoes
d. stabilize the level of the echoes
Answers: 1a 2b 3a 4a,b,c 5a 6b