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Ultrasonography-physics-1

48 Questions  I  By Taofu2009la
Ultrasonography-physics-1
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1.  Relative measurement of intensity based on a logarithmic scale is expressed in:
A.
B.
C.
D.
E.
2.  When attempting to identify fetal heart motion, the frame rate of the real-time system should be
A.
B.
C.
D.
3.  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.
4.  True or FalseSampling intervals for cardiac flow imaging and vascular flow imaging are similar
A.
B.
5.  Diffraction refers to
A.
B.
C.
D.
6.  True or False?An annular array scanner uses mechanical beam steering.
A.
B.
7.  True or False?Lateral resolution improves with frequency.
A.
B.
8.  Interference patterns of reflected waves causes
A.
B.
C.
D.
E.
9.  Which of the following is true about the effect of frequency on Rayleigh scattering is true?
A.
B.
C.
D.
E.
10.  Changes in the Doppler shift frequencies within a color flow image sample site appear in the image as
A.
B.
C.
D.
11.  Which of the following is not a component of the time-gain compensation (TGC) curve?
A.
B.
C.
D.
12.  Turbulence in a vascular color flow image appears as
A.
B.
C.
D.
13.  What system control can you adjust to compensate for the effect of sound attenuation  in the body
A.
B.
C.
D.
E.
14.  True or False?Mechanical transducers are mechanically steered (MS) and mechanically focused (MS).
A.
B.
15.  True or False?Lateral resolution is decided by the beam diameter.
A.
B.
16.  Which of the following are you most likely to encounter when you scan a large fat mass
A.
B.
C.
D.
E.
17.  A large, smooth interface is usually called
A.
B.
C.
D.
18.  What happen to the reflected echo signal if you use a transducer with bandwidth between 2-5 MHz?
A.
B.
C.
D.
E.
19.  True or FalseThe frame rate of real-time scanners depends on the number of lines used to form the image.
A.
B.
20.  The range of pulse repetition frequencies used in diagnostic ultrasound is
A.
B.
C.
D.
21.  The normal range of wave length in medical application  is
A.
B.
C.
D.
22.  Which of the following interation of sound and tissue decreases the intensity of the transmitted beam
A.
B.
C.
D.
E.
23.  The number of frames per second necessary for a real-time image to be flicker free is 
A.
B.
C.
D.
24.  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.
25.  The comet tail artifact can be seen posterior to an object that has
A.
B.
C.
D.
26.  True or False The frequency and wavelength  of a sound will change when it propagates through tissue.
A.
B.
27.  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.
28.  Color flow imaging in the heart typically uses
A.
B.
C.
D.
29.  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.
30.  Which of the following is true?
A.
B.
C.
D.
31.  Power Doppler imaging is a good choice when you
A.
B.
C.
D.
32.  True or FalseImaging transducers are usually of high rather than low bandwidth.
A.
B.
33.  Which of the following is not user-adjustable?
A.
B.
C.
D.
E.
34.  The amount of energy transmitted and/or reflected at the boundary between two media depends on
A.
B.
C.
D.
35.  Which of the following crystals will produce sound with the lowest frequency?
A.
B.
C.
D.
36.  Which of the following combinations of frequency and intensity would most likely result in cavitaion?
A.
B.
C.
D.
37.  The ability to see deep vessels is limited by the fact that
A.
B.
C.
D.
38.  An annular array real-time scanner
A.
B.
C.
D.
39.  What is distinction between real-time scans and B-scans?
A.
B.
C.
D.
40.  Pulsing of the transmitted sound wave is necessary for real-time imaging because:
A.
B.
C.
D.
E.
41.  What occurs when you image a structure with oblique incidence?
A.
B.
C.
D.
E.
42.  True or False?In a pulse-echo system, the quality factor should be made as large as possible.
A.
B.
43.  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.
44.  True or False?Electronically steered scanners always produce higher resolution images thant do mechanically steered scanners.
A.
B.
45.  Snell's law refers to:
A.
B.
C.
D.
E.
46.  What happen to the reflected echo signal if you use a transducer with bandwidth between 2-5 MHz?
A.
B.
C.
D.
E.
47.  The edge shadowing occurs in which of following situations
A.
B.
C.
D.
48.  The impedance of a transducer active element is 1,900,000 rays, and the impedance of the skin is 1,400,000 rays. What is an acceptable impedance for the matching layer? 
A.
B.
C.
D.
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