Ultrasonography-physics-1

48 Questions  I  By Taofu2009la on January 17, 2010
Quiz to test your basic definion, concept and knowldge. It will increase your score by 20-50% in 2--4 weeks.

  

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1.  True or False?A pulse with a long pulse duration is likely to have a narrow badwidth?
A.
B.
2.  What interaction of ultrasound and tissue  is primarily responsible for imaging the internal structure of organs?
A.
B.
C.
D.
E.
3.  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.
4.  Pulsing of the transmitted sound wave is necessary for real-time imaging because:
A.
B.
C.
D.
E.
5.  Q factor refers to
A.
B.
C.
D.
6.  What do you do when you want to decrease a very bright echoes on the display?
A.
B.
C.
D.
E.
7.  Which of the following is  the least obstacle (impedance) to the transmission of ultrasound?
A.
B.
C.
D.
8.  True or False?The SPTA intensity will always be larger than the SATA intensity.
A.
B.
9.  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.
10.  What happen to the reflected echo signal if you use a transducer with bandwidth between 2-5 MHz?
A.
B.
C.
D.
E.
11.  Which of the following is not a component of the time-gain compensation (TGC) curve?
A.
B.
C.
D.
12.  When attempting to identify fetal heart motion, the frame rate of the real-time system should be
A.
B.
C.
D.
13.  Snell's law refers to:
A.
B.
C.
D.
E.
14.  True or False?A linear sequenced array cannot be dynamically focused.
A.
B.
15.  True or FalseAxial resolution is improved in the focal zone.
A.
B.
16.  What is distinction between real-time scans and B-scans?
A.
B.
C.
D.
17.  What system control can you adjust to compensate for the effect of sound attenuation  in the body
A.
B.
C.
D.
E.
18.  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.
19.  Diffraction refers to
A.
B.
C.
D.
20.  A 10-dB difference in signal intensity is equivalent to  
A.
B.
C.
D.
21.  True or False?In a pulse-echo system, the quality factor should be made as large as possible
A.
B.
22.  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.
23.  The transducer that would be best suited for intercostal scanning is
A.
B.
C.
D.
24.  Hyperechoic region after a cyst filled with fluid is best explained by:
A.
B.
C.
D.
E.
25.  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.
26.  True or FalseThe frame rate of real-time scanners depends on the number of lines used to form the image.
A.
B.
27.  Interference patterns of reflected waves causes
A.
B.
C.
D.
E.
28.  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.
29.  True or FalseSampling intervals for cardiac flow imaging and vascular flow imaging are similar
A.
B.
30.  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.
31.  Which of the following is true about the effect of frequency on Rayleigh scattering is true?
A.
B.
C.
D.
E.
32.  Which of the following is least likely cause for attenuation?
A.
B.
C.
D.
33.  Which of the following are you most likely to encounter when you scan a large fat mass
A.
B.
C.
D.
E.
34.  A transducer with a large bandwidth is likely to have
A.
B.
C.
D.
35.  True or False?An annular array scanner uses mechanical beam steering.
A.
B.
36.  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.
37.  Power Doppler imaging is a good choice when you
A.
B.
C.
D.
38.  True or FalseSmaller transducers always produce smaller beam diameters
A.
B.
39.  Changes in the Doppler shift frequencies within a color flow image sample site appear in the image as
A.
B.
C.
D.
40.  True or False?The intensity of the ultrasound beam is increased by 4 times if the amplitude is doubled.
A.
B.
41.  If you increase the pulse repetition frequency and leave all other controls unchanged, what will happen?
A.
B.
C.
D.
E.
42.  One begins reading a color flow image by
A.
B.
C.
D.
43.  True or False?Grating lobes are essential for the proper operation of a linear phased array.
A.
B.
44.  True or FalseElectronically steered scanners always produce higher resolution images than do mechanically steered scanners
A.
B.
45.  The number of frames per second necessary for a real-time image to be flicker free is
A.
B.
C.
D.
46.  What occurs when you image a structure with oblique incidence?
A.
B.
C.
D.
E.
47.  Which of the following crystals will produce sound with the lowest frequency?
A.
B.
C.
D.
48.  True or FalseThe spatial pulse length usually decrease when operating frequency is changed to high
A.
B.
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