Ultrasonography-physics-1

48 Questions  I  By Taofu2009la
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Sonography Quizzes & Trivia
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1.  The transducer that would be best suited for intercostal scanning is
A.
B.
C.
D.
2.  When attempting to identify fetal heart motion, the frame rate of the real-time system should be
A.
B.
C.
D.
3.  What do you do when you want to decrease a very bright echoes on the display?
A.
B.
C.
D.
E.
4.  The range of pulse repetition frequencies used in diagnostic ultrasound is
A.
B.
C.
D.
5.  Both the color and a point spectrum in a stenosis show high-frequency aliasing, one strategy for removing the aliasing involes
A.
B.
C.
D.
6.  The comet tail artifact can be seen posterior to an object that has
A.
B.
C.
D.
7.  True or False?Lateral resolution improves with frequency.
A.
B.
8.  True or FalseCardiac flowing imaging also works well in the vascular system because the design can handle the high attenuation rates in cardiac imaging
A.
B.
9.  The number of frames per second necessary for a real-time image to be flicker free is
A.
B.
C.
D.
10.  True or False?In a pulse-echo system, the quality factor should be made as large as possible
A.
B.
11.  Hyperechoic region after a cyst filled with fluid is best explained by:
A.
B.
C.
D.
E.
12.  One begins reading a color flow image by
A.
B.
C.
D.
13.  The ability to see deep vessels is limited by the fact that
A.
B.
C.
D.
14.  Which control would you adjust to alter the dynamic range of the displayed echoes?
A.
B.
C.
D.
E.
15.  If a 2-Mhz frequency is used in  human soft tissue, the wavelength is about
A.
B.
C.
D.
16.  Q factor refers to
A.
B.
C.
D.
17.  True or FalseThe spatial pulse length usually decrease when operating frequency is changed to high
A.
B.
18.  True or FalseElectronically steered scanners always produce higher resolution images than do mechanically steered scanners
A.
B.
19.  The shadow behind the stone can be best explained as which of following sound-tissue interaction?
A.
B.
C.
D.
E.
20.  Which of the following combinations of frequency and intensity would most likely result in cavitaion?
A.
B.
C.
D.
21.  True or False?In general, tissue ultrasonic intensity levels are higher for single-point spectra than for color flow imaging with the same system.
A.
B.
22.  What is distinction between real-time scans and B-scans?
A.
B.
C.
D.
23.  High frequency transducers have
A.
B.
C.
D.
24.  Which of the following is true?
A.
B.
C.
D.
25.  The edge shadowing occurs in which of following situations
A.
B.
C.
D.
26.  A 10-dB difference in signal intensity is equivalent to  
A.
B.
C.
D.
27.  What occurs when you image a structure with oblique incidence?
A.
B.
C.
D.
E.
28.  Beam steering is achieved in a linear phase array by
A.
B.
C.
D.
29.  Which of the following will not cause a redirection of part of the ultrasound energy?
A.
B.
C.
D.
E.
30.  Increase the pulse repetition period
A.
B.
C.
D.
31.  What is the purpose of curving the transducer elements or applying a lens over the elements?
A.
B.
C.
D.
E.
32.  The amount of energy transmitted and/or reflected at the boundary between two media depends on
A.
B.
C.
D.
33.  Cardiac color flow imaging is limited with a mechanical sector scanner because
A.
B.
C.
D.
34.  Color flow imaging in the heart typically uses
A.
B.
C.
D.
35.  True or False?Electronically steered scanners always produce higher resolution images thant do mechanically steered scanners.
A.
B.
36.  True or False?Mechanical transducers are mechanically steered (MS) and mechanically focused (MS).
A.
B.
37.  Acoustic exposure can be changed by which of the following using pulsed-wave Doppler?
A.
B.
C.
D.
E.
38.  Power Doppler imaging is a good choice when you
A.
B.
C.
D.
39.  Pulsing of the transmitted sound wave is necessary for real-time imaging because:
A.
B.
C.
D.
E.
40.  Which of the following is true about the effect of frequency on Rayleigh scattering is true?
A.
B.
C.
D.
E.
41.  Which factor least influences axial resolution?
A.
B.
C.
D.
E.
42.  Snell's law refers to:
A.
B.
C.
D.
E.
43.  Which of the following interation of sound and tissue decreases the intensity of the transmitted beam
A.
B.
C.
D.
E.
44.  True or False?The intensity of the ultrasound beam is increased by 4 times if the amplitude is doubled.
A.
B.
45.  Which of the following crystals will produce sound with the lowest frequency?
A.
B.
C.
D.
46.  True or False?In a pulse-echo system, the quality factor should be made as large as possible.
A.
B.
47.  What best describes the difference between the ultrasound frequencies used for Doppler and for B-mode imaging with a given transducer?
A.
B.
C.
D.
E.
48.  True or False The frequency and wavelength  of a sound will change when it propagates through tissue.
A.
B.
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