Ultrasonography-physics-1

48 Questions  I  By Taofu2009la
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1.  The edge shadowing occurs in which of following situations
A.
B.
C.
D.
2.  Based on range equation, which is necessary to calculate the distance to the reflector?
A.
B.
C.
D.
3.  What do you do when you want to decrease a very bright echoes on the display?
A.
B.
C.
D.
E.
4.  True or FalseSmaller transducers always produce smaller beam diameters
A.
B.
5.  True or False?A linear sequenced array cannot be dynamically focused.
A.
B.
6.  Which of the following interation of sound and tissue decreases the intensity of the transmitted beam
A.
B.
C.
D.
E.
7.  The amount of energy transmitted and/or reflected at the boundary between two media depends on
A.
B.
C.
D.
8.  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.
9.  A large, smooth interface is usually called
A.
B.
C.
D.
10.  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.
11.  A 10-dB difference in signal intensity is equivalent to  
A.
B.
C.
D.
12.  Which of the following is true about the effect of frequency on Rayleigh scattering is true?
A.
B.
C.
D.
E.
13.  Power Doppler imaging is a good choice when you
A.
B.
C.
D.
14.  The shadow behind the stone can be best explained as which of following sound-tissue interaction?
A.
B.
C.
D.
E.
15.  The transducer that would be best suited for intercostal scanning is
A.
B.
C.
D.
16.  What occurs when you image a structure with oblique incidence?
A.
B.
C.
D.
E.
17.  Hyperechoic region after a cyst filled with fluid is best explained by:
A.
B.
C.
D.
E.
18.  Changes in the Doppler shift frequencies within a color flow image sample site appear in the image as
A.
B.
C.
D.
19.  Acoustic exposure can be changed by which of the following using pulsed-wave Doppler?
A.
B.
C.
D.
E.
20.  Increase the pulse repetition period
A.
B.
C.
D.
21.  True or FalseThe spatial pulse length usually decrease when operating frequency is changed to high
A.
B.
22.  True or False The frequency and wavelength  of a sound will change when it propagates through tissue.
A.
B.
23.  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.
24.  If a 2-Mhz frequency is used in  human soft tissue, the wavelength is about
A.
B.
C.
D.
25.  Cardiac color flow imaging is limited with a mechanical sector scanner because
A.
B.
C.
D.
26.  True or FalseAxial resolution is improved in the focal zone.
A.
B.
27.  The ability to see deep vessels is limited by the fact that
A.
B.
C.
D.
28.  Bandwidth refers to:
A.
B.
C.
D.
E.
29.  Which of the following is least likely cause for attenuation?
A.
B.
C.
D.
30.  True or False?In a pulse-echo system, the quality factor should be made as large as possible.
A.
B.
31.  True or FalseSampling intervals for cardiac flow imaging and vascular flow imaging are similar
A.
B.
32.  Beam steering is achieved in a linear phase array by
A.
B.
C.
D.
33.  Which of the following is not a component of the time-gain compensation (TGC) curve?
A.
B.
C.
D.
34.  True or FalseElectronically steered scanners always produce higher resolution images than do mechanically steered scanners
A.
B.
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.  True or False?The SPTA intensity will always be larger than the SATA intensity.
A.
B.
38.  True or False?Electronically steered scanners always produce higher resolution images thant do mechanically steered scanners.
A.
B.
39.  True or False?Lateral resolution improves with frequency.
A.
B.
40.  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.
41.  What system control can you adjust to compensate for the effect of sound attenuation  in the body
A.
B.
C.
D.
E.
42.  True or FalseThe frame rate of real-time scanners depends on the number of lines used to form the image.
A.
B.
43.  Which of the following will not cause a redirection of part of the ultrasound energy?
A.
B.
C.
D.
E.
44.  When attempting to identify fetal heart motion, the frame rate of the real-time system should be
A.
B.
C.
D.
45.  Relative measurement of intensity based on a logarithmic scale is expressed in:
A.
B.
C.
D.
E.
46.  High frequency transducers have
A.
B.
C.
D.
47.  True or False?The intensity of the ultrasound beam is increased by 4 times if the amplitude is doubled.
A.
B.
48.  A transducer with a large bandwidth is likely to have
A.
B.
C.
D.
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