Physics Questions

48 Questions  I  By Paga
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1.  The frequency closest to the lower limit of US is
A.
B.
C.
D.
2.  Put in decreasing order
A.
B.
C.
D.
3.  Which of the following is determined by the source and the medium?
A.
B.
C.
D.
4.  As a result of _____________ the propagation sped increases
A.
B.
C.
D.
5.  Put in decreasing order of propagation speed.
A.
B.
C.
6.  If the frequency of US is increased from 0.77 MHz to 1.54 MHz, what happends to the wavelength?
A.
B.
C.
D.
7.  If the intensity of a sound beam remains unchanged while the beam area is reduced in half, what has happend to the power?
A.
B.
C.
D.
8.  What is the minimum value of the duty factor?
A.
B.
C.
D.
9.  If a 5MHz sound wave is traveling in the tissues listed below, which will have the longest wavelength?
A.
B.
C.
D.
10.  As the impedances (z (rayls) = density (kg/m^3) x prop. speed (m/s) or acoustic resistance to sound traveling in a medium, becomes vastly different, the
A.
B.
C.
D.
11.  With normal incidence, what factors affect refraction of US?
A.
B.
C.
D.
12.  The most likely amount of reflection at a boundary between soft tissue is:
A.
B.
C.
D.
13.  How many cm are 60 millimeters
A.
B.
C.
D.
14.  How is range ambiguity artifact eliminated?
A.
B.
C.
D.
15.  Under which of the following conditions is lateral resolution improved?
A.
B.
C.
D.
E.
16.  Which transducer would be best to image superficial structures?
A.
B.
C.
D.
17.  If the frame rate increases and the lines per frame is unchanged, what else must happen?
A.
B.
C.
D.
18.  TRUE OR FALSEA system which was working well now does not display clear images in the far field.  This may be a problem with the monitor.
A.
B.
19.  If the output of an US machine is calibrated in dB and the output is increased by 20 dB, the beam intensity is increased
A.
B.
C.
D.
20.  Which of the following will result in the greatest number of shades of grapy in a digital image display?
A.
B.
C.
D.
E.
21.  With good images on the CRT but not on the strip chart recorder, one should
A.
B.
C.
D.
22.  Compression is used to
A.
B.
C.
23.  In which of these biologic tissues will sound waves propagate most quickly?
A.
B.
C.
D.
E.
24.  All of the following statements regarding in-vitro bioeffects are true EXCEPT?
A.
B.
C.
D.
25.  Which of the following improves signal to noise ratio
A.
B.
C.
D.
E.
26.  Under which circumstances is cavitation most likely to occur
A.
B.
C.
D.
27.  What is displayed on the y-axis of an m-mode image?
A.
B.
C.
D.
28.  An amplifier of an ultrasound system increases the voltage of a signal from 0.0001 to 0.1 volt.  What is the amplification
A.
B.
C.
D.
29.  The impedances of tissue is 3 x 10^5 rayls and for the PZT crystal is 6 x 10^6 rayls.  What is the best impedance for the matching layer?
A.
B.
C.
D.
E.
30.  Put in increasing order of propagation speed
A.
B.
C.
D.
E.
31.  What is propagation speed determined by
A.
B.
C.
D.
E.
32.  If 300,000 cycles occur in a second, what is the wave's frequency?
A.
B.
C.
D.
E.
33.  All of the following will improve temporal resolution EXCEPT
A.
B.
C.
D.
E.
34.  What component of a transducer changes electrical to mechanical and mechanical back to electrical engergy?
A.
B.
35.  What are typical clinical Doppler frequencies
A.
B.
C.
D.
36.  What is the actual time that an US machine is creating a pulse?
A.
B.
C.
D.
37.  What is the significance of gray scale variation in the spectrum of a pulssed wave Doppler display?
A.
B.
C.
D.
E.
38.  What is the production of deformation from voltage called?
A.
B.
C.
D.
39.  What is the elimination of voltages that do not exceed a certain level?
A.
B.
C.
D.
40.  How many data bits are needed to represent 46 gray shades?
A.
B.
C.
D.
41.  Which of the following is associated with cavitation?
A.
B.
C.
D.
42.  All of the following are true of normal cavitation EXCEPT:
A.
B.
C.
D.
E.
43.  The packet size in color Doppler refers to the number of :
A.
B.
C.
D.
E.
44.  A commonly used process for determining direction in a Doppler instrument is
A.
B.
C.
D.
E.
45.  What is the maximum velocity limit for a 3 MHz CW Doppler unit operating at a depth of 4cm?
A.
B.
C.
D.
E.
46.  What method is used to steer the color beam with a linear array transducer?
A.
B.
C.
D.
E.
47.  Increasing the wall filter during Doppler sampling will:
A.
B.
C.
D.
E.
48.  What would be the most likely result from increasing the transmit frequecy of the color Doppler?
A.
B.
C.
D.
E.
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