Ultrasonography-physics-1

48 Questions  I  By Taofu2009la
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1.  The transducer that would be best suited for intercostal scanning is
A.
B.
C.
D.
2.  True or False?The intensity of the ultrasound beam is increased by 4 times if the amplitude is doubled.
A.
B.
3.  Changes in the Doppler shift frequencies within a color flow image sample site appear in the image as
A.
B.
C.
D.
4.  Which control would you adjust to alter the dynamic range of the displayed echoes?
A.
B.
C.
D.
E.
5.  True or False?Lateral resolution is decided by the beam diameter.
A.
B.
6.  A large, smooth interface is usually called
A.
B.
C.
D.
7.  What system control can you adjust to compensate for the effect of sound attenuation  in the body
A.
B.
C.
D.
E.
8.  If you increase the pulse repetition frequency and leave all other controls unchanged, what will happen?
A.
B.
C.
D.
E.
9.  Increase the pulse repetition period
A.
B.
C.
D.
10.  A transducer with a large bandwidth is likely to have
A.
B.
C.
D.
11.  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.
12.  True or False?Electronically steered scanners always produce higher resolution images thant do mechanically steered scanners.
A.
B.
13.  Pulsing of the transmitted sound wave is necessary for real-time imaging because:
A.
B.
C.
D.
E.
14.  Which of the following are you most likely to encounter when you scan a large fat mass
A.
B.
C.
D.
E.
15.  The range of pulse repetition frequencies used in diagnostic ultrasound is
A.
B.
C.
D.
16.  The comet tail artifact can be seen posterior to an object that has
A.
B.
C.
D.
17.  The normal range of wave length in medical application  is
A.
B.
C.
D.
18.  The ability to see deep vessels is limited by the fact that
A.
B.
C.
D.
19.  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.
20.  Which of the following is true about the effect of frequency on Rayleigh scattering is true?
A.
B.
C.
D.
E.
21.  Snell's law refers to:
A.
B.
C.
D.
E.
22.  Bandwidth refers to:
A.
B.
C.
D.
E.
23.  Interference patterns of reflected waves causes
A.
B.
C.
D.
E.
24.  True or False?The SPTA intensity will always be larger than the SATA intensity.
A.
B.
25.  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.
26.  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.
27.  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.
28.  Which factor least influences axial resolution?
A.
B.
C.
D.
E.
29.  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.
30.  Which of the following is least likely cause for attenuation?
A.
B.
C.
D.
31.  True or False?Mechanical transducers are mechanically steered (MS) and mechanically focused (MS).
A.
B.
32.  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.
33.  Axial resolution is determined by which of the following?
A.
B.
C.
D.
E.
34.  What is distinction between real-time scans and B-scans?
A.
B.
C.
D.
35.  True or FalseSmaller transducers always produce smaller beam diameters
A.
B.
36.  Cardiac color flow imaging is limited with a mechanical sector scanner because
A.
B.
C.
D.
37.  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.
38.  Relative measurement of intensity based on a logarithmic scale is expressed in:
A.
B.
C.
D.
E.
39.  True or FalseAxial resolution is improved in the focal zone.
A.
B.
40.  True or False?An annular array scanner uses mechanical beam steering.
A.
B.
41.  What is the purpose of curving the transducer elements or applying a lens over the elements?
A.
B.
C.
D.
E.
42.  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.
43.  Q factor refers to
A.
B.
C.
D.
44.  Which of the following is true?
A.
B.
C.
D.
45.  What happen to the reflected echo signal if you use a transducer with bandwidth between 2-5 MHz?
A.
B.
C.
D.
E.
46.  The number of frames per second necessary for a real-time image to be flicker free is
A.
B.
C.
D.
47.  Which of the following crystals will produce sound with the lowest frequency?
A.
B.
C.
D.
48.  Beam steering is achieved in a linear phase array by
A.
B.
C.
D.
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