Ultrasonography-physics-1

48 Questions  I  By Taofu2009la
Sonography Quizzes & Trivia
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1.  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.
2.  True or False?The synchronous signal processing uses a Doppler carrier frequency that is the same as the imaging center operating frequency
A.
B.
3.  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.
4.  Which of the following is not user-adjustable?
A.
B.
C.
D.
E.
5.  Which factor least influences axial resolution?
A.
B.
C.
D.
E.
6.  True or FalseSampling intervals for cardiac flow imaging and vascular flow imaging are similar
A.
B.
7.  If a 2-Mhz frequency is used in  human soft tissue, the wavelength is about
A.
B.
C.
D.
8.  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.
9.  Which of the following is true?
A.
B.
C.
D.
10.  What is distinction between real-time scans and B-scans?
A.
B.
C.
D.
11.  An another term for nonspecular reflection is
A.
B.
C.
D.
E.
12.  True or False?Mechanical transducers are mechanically steered (MS) and mechanically focused (MS).
A.
B.
13.  True or FalseThe frame rate of real-time scanners depends on the number of lines used to form the image.
A.
B.
14.  One begins reading a color flow image by
A.
B.
C.
D.
15.  True or FalseSmaller transducers always produce smaller beam diameters
A.
B.
16.  Snell's law refers to:
A.
B.
C.
D.
E.
17.  Based on range equation, which is necessary to calculate the distance to the reflector?
A.
B.
C.
D.
18.  The ability to see deep vessels is limited by the fact that
A.
B.
C.
D.
19.  True or FalseElectronically steered scanners always produce higher resolution images than do mechanically steered scanners
A.
B.
20.  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.
21.  Which of the following crystals will produce sound with the lowest frequency?
A.
B.
C.
D.
22.  True or False?Lateral resolution is decided by the beam diameter.
A.
B.
23.  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.
24.  What is the purpose of curving the transducer elements or applying a lens over the elements?
A.
B.
C.
D.
E.
25.  If you increase the pulse repetition frequency and leave all other controls unchanged, what will happen?
A.
B.
C.
D.
E.
26.  A transducer with a large bandwidth is likely to have
A.
B.
C.
D.
27.  What happen to the reflected echo signal if you use a transducer with bandwidth between 2-5 MHz?
A.
B.
C.
D.
E.
28.  What system control can you adjust to compensate for the effect of sound attenuation  in the body
A.
B.
C.
D.
E.
29.  Q factor refers to
A.
B.
C.
D.
30.  Turbulence in a vascular color flow image appears as
A.
B.
C.
D.
31.  A transducer with a large bandwidth is likely to have
A.
B.
C.
D.
32.  Which of the following is true about the effect of frequency on Rayleigh scattering is true?
A.
B.
C.
D.
E.
33.  A large, smooth interface is usually called
A.
B.
C.
D.
34.  An annular array real-time scanner
A.
B.
C.
D.
35.  True or FalseThe spatial pulse length usually decrease when operating frequency is changed to high
A.
B.
36.  True or False?A linear sequenced array cannot be dynamically focused.
A.
B.
37.  The normal range of wave length in medical application  is
A.
B.
C.
D.
38.  Beam steering is achieved in a linear phase array by
A.
B.
C.
D.
39.  Which control would you adjust to alter the dynamic range of the displayed echoes?
A.
B.
C.
D.
E.
40.  Which of the following is least likely cause for attenuation?
A.
B.
C.
D.
41.  Which of the following is  the least obstacle (impedance) to the transmission of ultrasound?
A.
B.
C.
D.
42.  The shadow behind the stone can be best explained as which of following sound-tissue interaction?
A.
B.
C.
D.
E.
43.  Relative measurement of intensity based on a logarithmic scale is expressed in:
A.
B.
C.
D.
E.
44.  Bandwidth refers to:
A.
B.
C.
D.
E.
45.  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.
46.  The number of frames per second necessary for a real-time image to be flicker free is
A.
B.
C.
D.
47.  What happen to the reflected echo signal if you use a transducer with bandwidth between 2-5 MHz?
A.
B.
C.
D.
E.
48.  True or FalseAxial resolution is improved in the focal zone.
A.
B.
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