Ultrasonography-physics-1

48 Questions  I  By Taofu2009la
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Sonography Quizzes & Trivia
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1.  Which of the following is not user-adjustable?
A.
B.
C.
D.
E.
2.  True or False The frequency and wavelength  of a sound will change when it propagates through tissue.
A.
B.
3.  What is the purpose of curving the transducer elements or applying a lens over the elements?
A.
B.
C.
D.
E.
4.  The number of frames per second necessary for a real-time image to be flicker free is
A.
B.
C.
D.
5.  What interaction of ultrasound and tissue  is primarily responsible for imaging the internal structure of organs?
A.
B.
C.
D.
E.
6.  What happen to the reflected echo signal if you use a transducer with bandwidth between 2-5 MHz?
A.
B.
C.
D.
E.
7.  True or False?Lateral resolution improves with frequency.
A.
B.
8.  Diffraction refers to
A.
B.
C.
D.
9.  Which of the following will not cause a redirection of part of the ultrasound energy?
A.
B.
C.
D.
E.
10.  Color flow imaging in the heart typically uses
A.
B.
C.
D.
11.  What do you do when you want to decrease a very bright echoes on the display?
A.
B.
C.
D.
E.
12.  The comet tail artifact can be seen posterior to an object that has
A.
B.
C.
D.
13.  Which of the following combinations of frequency and intensity would most likely result in cavitaion?
A.
B.
C.
D.
14.  The amount of energy transmitted and/or reflected at the boundary between two media depends on
A.
B.
C.
D.
15.  The edge shadowing occurs in which of following situations
A.
B.
C.
D.
16.  Which of the following are you most likely to encounter when you scan a large fat mass
A.
B.
C.
D.
E.
17.  The mirror image artifact is commonly seen around which of the following structures?
A.
B.
C.
D.
18.  True or False?Electronically steered scanners always produce higher resolution images thant do mechanically steered scanners.
A.
B.
19.  A 10-dB difference in signal intensity is equivalent to  
A.
B.
C.
D.
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.  Bandwidth refers to:
A.
B.
C.
D.
E.
22.  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.
23.  When attempting to identify fetal heart motion, the frame rate of the real-time system should be
A.
B.
C.
D.
24.  If a 2-Mhz frequency is used in  human soft tissue, the wavelength is about
A.
B.
C.
D.
25.  Which of the following is  the least obstacle (impedance) to the transmission of ultrasound?
A.
B.
C.
D.
26.  True or False?Mechanical transducers are mechanically steered (MS) and mechanically focused (MS).
A.
B.
27.  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.
28.  Which factor least influences axial resolution?
A.
B.
C.
D.
E.
29.  The transducer that would be best suited for intercostal scanning is
A.
B.
C.
D.
30.  The number of frames per second necessary for a real-time image to be flicker free is 
A.
B.
C.
D.
31.  True or False?Grating lobes are essential for the proper operation of a linear phased array.
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.  Acoustic exposure can be changed by which of the following using pulsed-wave Doppler?
A.
B.
C.
D.
E.
34.  An annular array real-time scanner
A.
B.
C.
D.
35.  True or False?An annular array scanner uses mechanical beam steering.
A.
B.
36.  High frequency transducers have
A.
B.
C.
D.
37.  Which of the following crystals will produce sound with the lowest frequency?
A.
B.
C.
D.
38.  True or False?The synchronous signal processing uses a Doppler carrier frequency that is the same as the imaging center operating frequency
A.
B.
39.  True or False?A linear sequenced array cannot be dynamically focused.
A.
B.
40.  A large, smooth interface is usually called
A.
B.
C.
D.
41.  The shadow behind the stone can be best explained as which of following sound-tissue interaction?
A.
B.
C.
D.
E.
42.  Pulsing of the transmitted sound wave is necessary for real-time imaging because:
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B.
C.
D.
E.
43.  What occurs when you image a structure with oblique incidence?
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B.
C.
D.
E.
44.  Turbulence in a vascular color flow image appears as
A.
B.
C.
D.
45.  Relative measurement of intensity based on a logarithmic scale is expressed in:
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B.
C.
D.
E.
46.  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.
47.  Power Doppler imaging is a good choice when you
A.
B.
C.
D.
48.  Based on range equation, which is necessary to calculate the distance to the reflector?
A.
B.
C.
D.
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