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Ultrasonography-physics-1

48 Questions  I  By Taofu2009la
Sonography Quizzes & Trivia
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 FalseSmaller transducers always produce smaller beam diameters
A.
B.
2.  True or FalseElectronically steered scanners always produce higher resolution images than do mechanically steered scanners
A.
B.
3.  What is distinction between real-time scans and B-scans?
A.
B.
C.
D.
4.  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.
5.  True or FalseSampling intervals for cardiac flow imaging and vascular flow imaging are similar
A.
B.
6.  True or FalseAxial resolution is improved in the focal zone.
A.
B.
7.  Which of the following is true?
A.
B.
C.
D.
8.  Relative measurement of intensity based on a logarithmic scale is expressed in:
A.
B.
C.
D.
E.
9.  Acoustic exposure can be changed by which of the following using pulsed-wave Doppler?
A.
B.
C.
D.
E.
10.  A transducer with a large bandwidth is likely to have
A.
B.
C.
D.
11.  High frequency transducers have
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.  An another term for nonspecular reflection is
A.
B.
C.
D.
E.
14.  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.
15.  The number of frames per second necessary for a real-time image to be flicker free is 
A.
B.
C.
D.
16.  Snell's law refers to:
A.
B.
C.
D.
E.
17.  True or False?The SPTA intensity will always be larger than the SATA intensity.
A.
B.
18.  Which of the following is not a component of the time-gain compensation (TGC) curve?
A.
B.
C.
D.
19.  True or False?Grating lobes are essential for the proper operation of a linear phased array.
A.
B.
20.  The shadow behind the stone can be best explained as which of following sound-tissue interaction?
A.
B.
C.
D.
E.
21.  The number of frames per second necessary for a real-time image to be flicker free is
A.
B.
C.
D.
22.  A 10-dB difference in signal intensity is equivalent to  
A.
B.
C.
D.
23.  An annular array real-time scanner
A.
B.
C.
D.
24.  Which of the following is least likely cause for attenuation?
A.
B.
C.
D.
25.  Pulsing of the transmitted sound wave is necessary for real-time imaging because:
A.
B.
C.
D.
E.
26.  What is the purpose of curving the transducer elements or applying a lens over the elements?
A.
B.
C.
D.
E.
27.  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.
28.  What do you do when you want to decrease a very bright echoes on the display?
A.
B.
C.
D.
E.
29.  True or False?The synchronous signal processing uses a Doppler carrier frequency that is the same as the imaging center operating frequency
A.
B.
30.  Which of the following are you most likely to encounter when you scan a large fat mass
A.
B.
C.
D.
E.
31.  True or False?The intensity of the ultrasound beam is increased by 4 times if the amplitude is doubled.
A.
B.
32.  Based on range equation, which is necessary to calculate the distance to the reflector?
A.
B.
C.
D.
33.  True or FalseThe spatial pulse length usually decrease when operating frequency is changed to high
A.
B.
34.  True or False?A linear sequenced array cannot be dynamically focused.
A.
B.
35.  Which of the following will not cause a redirection of part of the ultrasound energy?
A.
B.
C.
D.
E.
36.  What system control can you adjust to compensate for the effect of sound attenuation  in the body
A.
B.
C.
D.
E.
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.  Which of the following combinations of frequency and intensity would most likely result in cavitaion?
A.
B.
C.
D.
39.  Diffraction refers to
A.
B.
C.
D.
40.  What happen to the reflected echo signal if you use a transducer with bandwidth between 2-5 MHz?
A.
B.
C.
D.
E.
41.  True or False?Lateral resolution is decided by the beam diameter.
A.
B.
42.  What interaction of ultrasound and tissue  is primarily responsible for imaging the internal structure of organs?
A.
B.
C.
D.
E.
43.  Bandwidth refers to:
A.
B.
C.
D.
E.
44.  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.
45.  Beam steering is achieved in a linear phase array by
A.
B.
C.
D.
46.  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.
47.  True or FalseImaging transducers are usually of high rather than low bandwidth.
A.
B.
48.  Which of the following is true about the effect of frequency on Rayleigh scattering is true?
A.
B.
C.
D.
E.
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