Ultrasonography-physics-1

48 Questions  I  By Taofu2009la
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Sonography Quizzes & Trivia
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1.  What happen to the reflected echo signal if you use a transducer with bandwidth between 2-5 MHz?
A.
B.
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D.
E.
2.  What occurs when you image a structure with oblique incidence?
A.
B.
C.
D.
E.
3.  Bandwidth refers to:
A.
B.
C.
D.
E.
4.  True or False?Increasing a sonograph's output power levels and PRF to increase penetration and frame rate can produce an artifact of high-frequency aliasing.
A.
B.
5.  Which of the following is least likely cause for attenuation?
A.
B.
C.
D.
6.  Turbulence in a vascular color flow image appears as
A.
B.
C.
D.
7.  A 10-dB difference in signal intensity is equivalent to  
A.
B.
C.
D.
8.  What interaction of ultrasound and tissue  is primarily responsible for imaging the internal structure of organs?
A.
B.
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D.
E.
9.  The comet tail artifact can be seen posterior to an object that has
A.
B.
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D.
10.  What do you do when you want to decrease a very bright echoes on the display?
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B.
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E.
11.  Axial resolution is determined by which of the following?
A.
B.
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E.
12.  True or FalseA videotape recorder records at a rate of 30 frames/s and therefore cannot be used to record images from a mechanical scanner operating a lower frame  rates
A.
B.
13.  Q factor refers to
A.
B.
C.
D.
14.  True or FalseThe frame rate of real-time scanners depends on the number of lines used to form the image.
A.
B.
15.  Changes in the Doppler shift frequencies within a color flow image sample site appear in the image as
A.
B.
C.
D.
16.  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.
17.  True or False The frequency and wavelength  of a sound will change when it propagates through tissue.
A.
B.
18.  True or False?The color coding of red arteries and blue veins and the slow high-resolution frame rates make the identity of arteries and veins in the abdomen direct and easy.
A.
B.
19.  High frequency transducers have
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B.
C.
D.
20.  Acoustic exposure can be changed by which of the following using pulsed-wave Doppler?
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B.
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E.
21.  When the sound beam is refracted during a sonographic examination, which of the following might you detect on the ultrasound image?
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B.
C.
D.
E.
22.  Which control would you adjust to alter the dynamic range of the displayed echoes?
A.
B.
C.
D.
E.
23.  True or False?A measurement of the peak systolic frequency in  a carotid artery with a single-point spectrum will be lower than a measurement of the color-encoded frequency at the same point.
A.
B.
24.  Color flow imaging in the heart typically uses
A.
B.
C.
D.
25.  Which of the following interation of sound and tissue decreases the intensity of the transmitted beam
A.
B.
C.
D.
E.
26.  Which of the following is  the least obstacle (impedance) to the transmission of ultrasound?
A.
B.
C.
D.
27.  True or False?The transducer produces more than one frequency.  The shorter the pulse, the more of these spectrum of other frequencies are also produced.
A.
B.
28.  True or False?Lateral resolution is decided by the beam diameter.
A.
B.
29.  True or False?Electronically steered scanners always produce higher resolution images thant do mechanically steered scanners.
A.
B.
30.  One begins reading a color flow image by
A.
B.
C.
D.
31.  Hyperechoic region after a cyst filled with fluid is best explained by:
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B.
C.
D.
E.
32.  Power Doppler imaging is a good choice when you
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B.
C.
D.
33.  True or False?Grating lobes are essential for the proper operation of a linear phased array.
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B.
34.  What system control can you adjust to compensate for the effect of sound attenuation  in the body
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B.
C.
D.
E.
35.  An another term for nonspecular reflection is
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36.  If a 2-Mhz frequency is used in  human soft tissue, the wavelength is about
A.
B.
C.
D.
37.  The range of pulse repetition frequencies used in diagnostic ultrasound is
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B.
C.
D.
38.  True or False?In a pulse-echo system, the quality factor should be made as large as possible.
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B.
39.  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.
40.  True or False?The synchronous signal processing uses a Doppler carrier frequency that is the same as the imaging center operating frequency
A.
B.
41.  Which of the following combinations of frequency and intensity would most likely result in cavitaion?
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B.
C.
D.
42.  Which of the following are you most likely to encounter when you scan a large fat mass
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B.
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D.
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43.  True or FalseElectronically steered scanners always produce higher resolution images than do mechanically steered scanners
A.
B.
44.  Interference patterns of reflected waves causes
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B.
C.
D.
E.
45.  True or FalseMoving from grey-scale only to full-screen color flow imaging in a system means that the image frame rate will probably increase.
A.
B.
46.  True or False?Lateral resolution improves with frequency.
A.
B.
47.  The mirror image artifact is commonly seen around which of the following structures?
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B.
C.
D.
48.  Both the color and a point spectrum in a stenosis show high-frequency aliasing, one strategy for removing the aliasing involes
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B.
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D.
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