Ultrasonography-physics-1

48 Questions  I  By Taofu2009la
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Sonography Quizzes & Trivia
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1.  The edge shadowing occurs in which of following situations
A.
B.
C.
D.
2.  A large, smooth interface is usually called
A.
B.
C.
D.
3.  What system control can you adjust to compensate for the effect of sound attenuation  in the body
A.
B.
C.
D.
E.
4.  Which of the following interation of sound and tissue decreases the intensity of the transmitted beam
A.
B.
C.
D.
E.
5.  An another term for nonspecular reflection is
A.
B.
C.
D.
E.
6.  Which of the following will not cause a redirection of part of the ultrasound energy?
A.
B.
C.
D.
E.
7.  Which of the following are you most likely to encounter when you scan a large fat mass
A.
B.
C.
D.
E.
8.  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.
9.  What interaction of ultrasound and tissue  is primarily responsible for imaging the internal structure of organs?
A.
B.
C.
D.
E.
10.  If the number of cycles in a pulse is increased but the wavelength remains the same, which of the following is true?
A.
B.
C.
D.
E.
11.  True or False The frequency and wavelength  of a sound will change when it propagates through tissue.
A.
B.
12.  Bandwidth refers to:
A.
B.
C.
D.
E.
13.  Interference patterns of reflected waves causes
A.
B.
C.
D.
E.
14.  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.
15.  Which of the following crystals will produce sound with the lowest frequency?
A.
B.
C.
D.
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16.  True or FalseImaging transducers are usually of high rather than low bandwidth.
A.
B.
17.  True or False?A pulse with a long pulse duration is likely to have a narrow badwidth?
A.
B.
18.  True or FalseThe spatial pulse length usually decrease when operating frequency is changed to high
A.
B.
19.  True or FalseAxial resolution is improved in the focal zone.
A.
B.
20.  True or False?Lateral resolution is decided by the beam diameter.
A.
B.
21.  True or False?Lateral resolution improves with frequency.
A.
B.
22.  True or False?Grating lobes are essential for the proper operation of a linear phased array.
A.
B.
23.  True or False?Electronically steered scanners always produce higher resolution images thant do mechanically steered scanners.
A.
B.
24.  The number of frames per second necessary for a real-time image to be flicker free is
A.
B.
C.
D.
25.  True or False?The SPTA intensity will always be larger than the SATA intensity.
A.
B.
26.  True or False?The intensity of the ultrasound beam is increased by 4 times if the amplitude is doubled.
A.
B.
27.  True or False?In a pulse-echo system, the quality factor should be made as large as possible.
A.
B.
28.  The transducer that would be best suited for intercostal scanning is
A.
B.
C.
D.
29.  The normal range of wave length in medical application  is
A.
B.
C.
D.
30.  Which of the following combinations of frequency and intensity would most likely result in cavitaion?
A.
B.
C.
D.
31.  What is distinction between real-time scans and B-scans?
A.
B.
C.
D.
32.  Which of the following is not a component of the time-gain compensation (TGC) curve?
A.
B.
C.
D.
33.  The range of pulse repetition frequencies used in diagnostic ultrasound is
A.
B.
C.
D.
34.  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.
35.  Beam steering is achieved in a linear phase array by
A.
B.
C.
D.
36.  Which of the following is true?
A.
B.
C.
D.
37.  A transducer with a large bandwidth is likely to have
A.
B.
C.
D.
38.  An annular array real-time scanner
A.
B.
C.
D.
39.  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.
40.  True or False?Mechanical transducers are mechanically steered (MS) and mechanically focused (MS).
A.
B.
41.  True or False?The synchronous signal processing uses a Doppler carrier frequency that is the same as the imaging center operating frequency
A.
B.
42.  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.
43.  Changes in the Doppler shift frequencies within a color flow image sample site appear in the image as
A.
B.
C.
D.
44.  One begins reading a color flow image by
A.
B.
C.
D.
45.  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.
46.  Power Doppler imaging is a good choice when you
A.
B.
C.
D.
47.  Turbulence in a vascular color flow image appears as
A.
B.
C.
D.
48.  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.
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