8. Quality Control Flashcards
A tissue-equivalent _______ has an attenuation of approx. 0.5 dB/cm/MHz and a propagation speed of 1.54 mm/us. A ____ does not mimic tissue but provides a means for measuring some aspect of instrument performance.
a. phantom, test object
b. hydrophone, phantom
c. transducer, phantom
d. transducer, test object
a. phantom, test object
Test objects and phantoms are available commercially. T or F?
True
Test objects and phantoms can be used by the instrument operator. T or F?
True
A moving ____ test object is useful in checking the accuracy of Doppler spectral displays.
a. spectral
b. string
c. water
d. fluid
b. string
A ______ phantom is useful in stimulating physiologic ____ conditions for a Doppler instrument.
a. tissue, flow
b. flow, equilibrium
c. tissue, equilibrium
d. flow, flow
d. flow, flow
Which of the following is used for Doppler sensitivity measurements?
a. cyst phantom
b. profile test object
c. string test object
d. contrast phantom
e. none of the above
e. none of the above
Tissue-equivalent phantoms attempt to represent some acoustic property of _____.
a. tissues
b. blood
c. cancer
d. skin
a. tissues
The string test object measures volumetric flow rate. T or F?
False
With use of a hydrophone, which of the following can be measured or calculated? (more than one correct answer)
a. impedance
b. amplitude
c. period
d. pulse duration
e. pulse repetition period
b, c, d, e
All hydrophones consist of a small element mounted on the end of a needle. T or F?
False
A needle hydrophone contains a small _____ element.
a. transducer
b. piezoelectric
c. neither
d. both
d. both
Because of its small size, a hydrophone can measure spatial details of a sound beam. T or F?
True
A hydrophone _______
a. interacts with light
b. produces a voltage
c. measures intensity directly
d. measures total energy
e. none of the above
b. produces a voltage
