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Ultrasonography-physics-1

48 Questions  I  By Taofu2009la
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Sonography Quizzes & Trivia
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1.  What interaction of ultrasound and tissue  is primarily responsible for imaging the internal structure of organs?
A.
B.
C.
D.
E.
2.  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.
3.  True or False?In a pulse-echo system, the quality factor should be made as large as possible
A.
B.
4.  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.
5.  True or False?The SPTA intensity will always be larger than the SATA intensity.
A.
B.
6.  Which of the following is true about the effect of frequency on Rayleigh scattering is true?
A.
B.
C.
D.
E.
7.  True or FalseImaging transducers are usually of high rather than low bandwidth.
A.
B.
8.  What is the purpose of curving the transducer elements or applying a lens over the elements?
A.
B.
C.
D.
E.
9.  Based on range equation, which is necessary to calculate the distance to the reflector?
A.
B.
C.
D.
10.  Which of the following are you most likely to encounter when you scan a large fat mass
A.
B.
C.
D.
E.
11.  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.
12.  The number of frames per second necessary for a real-time image to be flicker free is 
A.
B.
C.
D.
13.  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.
14.  One begins reading a color flow image by
A.
B.
C.
D.
15.  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.
16.  True or False?Electronically steered scanners always produce higher resolution images thant do mechanically steered scanners.
A.
B.
17.  The mirror image artifact is commonly seen around which of the following structures?
A.
B.
C.
D.
18.  If a 2-Mhz frequency is used in  human soft tissue, the wavelength is about
A.
B.
C.
D.
19.  Which of the following crystals will produce sound with the lowest frequency?
A.
B.
C.
D.
20.  True or FalseAxial resolution is improved in the focal zone.
A.
B.
21.  A 10-dB difference in signal intensity is equivalent to  
A.
B.
C.
D.
22.  Axial resolution is determined by which of the following?
A.
B.
C.
D.
E.
23.  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.
24.  Interference patterns of reflected waves causes
A.
B.
C.
D.
E.
25.  A large, smooth interface is usually called
A.
B.
C.
D.
26.  Beam steering is achieved in a linear phase array by
A.
B.
C.
D.
27.  Turbulence in a vascular color flow image appears as
A.
B.
C.
D.
28.  Cardiac color flow imaging is limited with a mechanical sector scanner because
A.
B.
C.
D.
29.  Snell's law refers to:
A.
B.
C.
D.
E.
30.  An annular array real-time scanner
A.
B.
C.
D.
31.  True or False?In a pulse-echo system, the quality factor should be made as large as possible.
A.
B.
32.  What is distinction between real-time scans and B-scans?
A.
B.
C.
D.
33.  True or False The frequency and wavelength  of a sound will change when it propagates through tissue.
A.
B.
34.  The transducer that would be best suited for intercostal scanning is
A.
B.
C.
D.
35.  If the number of cycles in a pulse is increased but the wavelength remains the same, which of the following is true?
A.
B.
C.
D.
E.
36.  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.
37.  Bandwidth refers to:
A.
B.
C.
D.
E.
38.  True or False?The intensity of the ultrasound beam is increased by 4 times if the amplitude is doubled.
A.
B.
39.  The ability to see deep vessels is limited by the fact that
A.
B.
C.
D.
40.  Which factor least influences axial resolution?
A.
B.
C.
D.
E.
41.  What happen to the reflected echo signal if you use a transducer with bandwidth between 2-5 MHz?
A.
B.
C.
D.
E.
42.  Which control would you adjust to alter the dynamic range of the displayed echoes?
A.
B.
C.
D.
E.
43.  Hyperechoic region after a cyst filled with fluid is best explained by:
A.
B.
C.
D.
E.
44.  True or FalseSmaller transducers always produce smaller beam diameters
A.
B.
45.  Which of the following interation of sound and tissue decreases the intensity of the transmitted beam
A.
B.
C.
D.
E.
46.  The shadow behind the stone can be best explained as which of following sound-tissue interaction?
A.
B.
C.
D.
E.
47.  True or FalseThe frame rate of real-time scanners depends on the number of lines used to form the image.
A.
B.
48.  True or False?An annular array scanner uses mechanical beam steering.
A.
B.
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