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Ultrasonography-physics-1

48 Questions  I  By Taofu2009la
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Sonography Quizzes & Trivia
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1.  Which control would you adjust to alter the dynamic range of the displayed echoes?
A.
B.
C.
D.
E.
2.  True or FalseThe spatial pulse length usually decrease when operating frequency is changed to high
A.
B.
3.  Pulsing of the transmitted sound wave is necessary for real-time imaging because:
A.
B.
C.
D.
E.
4.  Beam steering is achieved in a linear phase array by
A.
B.
C.
D.
5.  True or False?The synchronous signal processing uses a Doppler carrier frequency that is the same as the imaging center operating frequency
A.
B.
6.  True or False?The shape of the sample volume in pulsed Doppler has a major effect on the content of the Doppler signal.
A.
B.
7.  What interaction of ultrasound and tissue  is primarily responsible for imaging the internal structure of organs?
A.
B.
C.
D.
E.
8.  Acoustic exposure can be changed by which of the following using pulsed-wave Doppler?
A.
B.
C.
D.
E.
9.  What system control can you adjust to compensate for the effect of sound attenuation  in the body
A.
B.
C.
D.
E.
10.  Snell's law refers to:
A.
B.
C.
D.
E.
11.  True or FalseSmaller transducers always produce smaller beam diameters
A.
B.
12.  Which of the following interation of sound and tissue decreases the intensity of the transmitted beam
A.
B.
C.
D.
E.
13.  True or False?Lateral resolution improves with frequency.
A.
B.
14.  The number of frames per second necessary for a real-time image to be flicker free is 
A.
B.
C.
D.
15.  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.
16.  What is the purpose of curving the transducer elements or applying a lens over the elements?
A.
B.
C.
D.
E.
17.  Bandwidth refers to:
A.
B.
C.
D.
E.
18.  Increase the pulse repetition period
A.
B.
C.
D.
19.  Cardiac color flow imaging is limited with a mechanical sector scanner because
A.
B.
C.
D.
20.  A transducer with a large bandwidth is likely to have
A.
B.
C.
D.
21.  What happen to the reflected echo signal if you use a transducer with bandwidth between 2-5 MHz?
A.
B.
C.
D.
E.
22.  Q factor refers to
A.
B.
C.
D.
23.  True or FalseAxial resolution is improved in the focal zone.
A.
B.
24.  True or False The frequency and wavelength  of a sound will change when it propagates through tissue.
A.
B.
25.  True or False?In a pulse-echo system, the quality factor should be made as large as possible
A.
B.
26.  An another term for nonspecular reflection is
A.
B.
C.
D.
E.
27.  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.
28.  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.
29.  High frequency transducers have
A.
B.
C.
D.
30.  The comet tail artifact can be seen posterior to an object that has
A.
B.
C.
D.
31.  The edge shadowing occurs in which of following situations
A.
B.
C.
D.
32.  Which of the following is not user-adjustable?
A.
B.
C.
D.
E.
33.  The mirror image artifact is commonly seen around which of the following structures?
A.
B.
C.
D.
34.  The amount of energy transmitted and/or reflected at the boundary between two media depends on
A.
B.
C.
D.
35.  What happen to the reflected echo signal if you use a transducer with bandwidth between 2-5 MHz?
A.
B.
C.
D.
E.
36.  Color flow imaging in the heart typically uses
A.
B.
C.
D.
37.  A large, smooth interface is usually called
A.
B.
C.
D.
38.  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.
39.  An annular array real-time scanner
A.
B.
C.
D.
40.  Turbulence in a vascular color flow image appears as
A.
B.
C.
D.
41.  Which of the following is not a component of the time-gain compensation (TGC) curve?
A.
B.
C.
D.
42.  Relative measurement of intensity based on a logarithmic scale is expressed in:
A.
B.
C.
D.
E.
43.  Which of the following is true?
A.
B.
C.
D.
44.  Which of the following is least likely cause for attenuation?
A.
B.
C.
D.
45.  What is distinction between real-time scans and B-scans?
A.
B.
C.
D.
46.  True or FalseSampling intervals for cardiac flow imaging and vascular flow imaging are similar
A.
B.
47.  When attempting to identify fetal heart motion, the frame rate of the real-time system should be
A.
B.
C.
D.
48.  When the sound beam is refracted during a sonographic examination, which of the following might you detect on the ultrasound image?
A.
B.
C.
D.
E.
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