1- The higher acoustic impedance is between two media, the
.................. the echo amplitude is
a. smaller
b. brighter
c. shallower
d. higher
2. which section of ultrasound system is usually responsible for
scan conversion?
3. what does the thickness of elements determine?
4. Which statement best describes attenuation :
a. an increase in the speed of the sound wave.
b. a reduction in the speed of the sound wave.
c. reduction of the wave's in amplitude and intensity as the
sound travels.
d. increment of the wave's amplitude as sound travels
5. If the returning echo has a lower frequency than the original
frequency while in Doppler mode, this an indication of what?
a. less blood flow in the blood vessel
b. more blood flow in the blood vessel
c. the reflected object is moving toward the transducer
d, the reflected object is moving away from the transducer.
6. How can the Side / Grating lobes be reduced ?
a. sub dice the elements
b. add an extra matching layer
c. change the propagation speed of sound in tissue.
d. Increase the system gain.