Ultrasonography-physics-1

48 Questions  I  By Taofu2009la
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1.  Which of the following crystals will produce sound with the lowest frequency?
A.
B.
C.
D.
2.  A transducer with a large bandwidth is likely to have
A.
B.
C.
D.
3.  What system control can you adjust to compensate for the effect of sound attenuation  in the body
A.
B.
C.
D.
E.
4.  Which of the following is not a component of the time-gain compensation (TGC) curve?
A.
B.
C.
D.
5.  What happen to the reflected echo signal if you use a transducer with bandwidth between 2-5 MHz?
A.
B.
C.
D.
E.
6.  True or FalseThe frame rate of real-time scanners depends on the number of lines used to form the image.
A.
B.
7.  Which of the following is true?
A.
B.
C.
D.
8.  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.
9.  What is the purpose of curving the transducer elements or applying a lens over the elements?
A.
B.
C.
D.
E.
10.  True or False?The intensity of the ultrasound beam is increased by 4 times if the amplitude is doubled.
A.
B.
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.  What happen to the reflected echo signal if you use a transducer with bandwidth between 2-5 MHz?
A.
B.
C.
D.
E.
13.  One begins reading a color flow image by
A.
B.
C.
D.
14.  What occurs when you image a structure with oblique incidence?
A.
B.
C.
D.
E.
15.  The mirror image artifact is commonly seen around which of the following structures?
A.
B.
C.
D.
16.  If a 2-Mhz frequency is used in  human soft tissue, the wavelength is about
A.
B.
C.
D.
17.  True or FalseThe spatial pulse length usually decrease when operating frequency is changed to high
A.
B.
18.  True or False?In a pulse-echo system, the quality factor should be made as large as possible.
A.
B.
19.  Beam steering is achieved in a linear phase array by
A.
B.
C.
D.
20.  True or False The frequency and wavelength  of a sound will change when it propagates through tissue.
A.
B.
21.  What is distinction between real-time scans and B-scans?
A.
B.
C.
D.
22.  True or FalseSmaller transducers always produce smaller beam diameters
A.
B.
23.  Which of the following interation of sound and tissue decreases the intensity of the transmitted beam
A.
B.
C.
D.
E.
24.  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.
25.  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.
26.  True or False?An annular array scanner uses mechanical beam steering.
A.
B.
27.  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.
28.  Color flow imaging in the heart typically uses
A.
B.
C.
D.
29.  A 10-dB difference in signal intensity is equivalent to  
A.
B.
C.
D.
30.  Turbulence in a vascular color flow image appears as
A.
B.
C.
D.
31.  An another term for nonspecular reflection is
A.
B.
C.
D.
E.
32.  True or False?The synchronous signal processing uses a Doppler carrier frequency that is the same as the imaging center operating frequency
A.
B.
33.  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.
34.  True or False?Lateral resolution is decided by the beam diameter.
A.
B.
35.  Q factor refers to
A.
B.
C.
D.
36.  Which control would you adjust to alter the dynamic range of the displayed echoes?
A.
B.
C.
D.
E.
37.  Axial resolution is determined by which of the following?
A.
B.
C.
D.
E.
38.  Snell's law refers to:
A.
B.
C.
D.
E.
39.  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.
40.  True or FalseSampling intervals for cardiac flow imaging and vascular flow imaging are similar
A.
B.
41.  A large, smooth interface is usually called
A.
B.
C.
D.
42.  High frequency transducers have
A.
B.
C.
D.
43.  The number of frames per second necessary for a real-time image to be flicker free is 
A.
B.
C.
D.
44.  Increase the pulse repetition period
A.
B.
C.
D.
45.  The edge shadowing occurs in which of following situations
A.
B.
C.
D.
46.  Which of the following is  the least obstacle (impedance) to the transmission of ultrasound?
A.
B.
C.
D.
47.  If you increase the pulse repetition frequency and leave all other controls unchanged, what will happen?
A.
B.
C.
D.
E.
48.  The transducer that would be best suited for intercostal scanning is
A.
B.
C.
D.
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