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Ultrasonography-physics-1

48 Questions  I  By Taofu2009la
Ultrasonography-physics-1
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1.  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.
2.  What is distinction between real-time scans and B-scans?
A.
B.
C.
D.
3.  Which of the following is true about the effect of frequency on Rayleigh scattering is true?
A.
B.
C.
D.
E.
4.  Beam steering is achieved in a linear phase array by
A.
B.
C.
D.
5.  True or False?In a pulse-echo system, the quality factor should be made as large as possible
A.
B.
6.  Which of the following is not user-adjustable?
A.
B.
C.
D.
E.
7.  High frequency transducers have
A.
B.
C.
D.
8.  The comet tail artifact can be seen posterior to an object that has
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.  True or FalseSampling intervals for cardiac flow imaging and vascular flow imaging are similar
A.
B.
11.  Which of the following is least likely cause for attenuation?
A.
B.
C.
D.
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 FalseImaging transducers are usually of high rather than low bandwidth.
A.
B.
14.  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.
15.  Snell's law refers to:
A.
B.
C.
D.
E.
16.  The shadow behind the stone can be best explained as which of following sound-tissue interaction?
A.
B.
C.
D.
E.
17.  What interaction of ultrasound and tissue  is primarily responsible for imaging the internal structure of organs?
A.
B.
C.
D.
E.
18.  A transducer with a large bandwidth is likely to have
A.
B.
C.
D.
19.  The mirror image artifact is commonly seen around which of the following structures?
A.
B.
C.
D.
20.  If you increase the pulse repetition frequency and leave all other controls unchanged, what will happen?
A.
B.
C.
D.
E.
21.  True or False?Grating lobes are essential for the proper operation of a linear phased array.
A.
B.
22.  A large, smooth interface is usually called
A.
B.
C.
D.
23.  True or False?Lateral resolution is decided by the beam diameter.
A.
B.
24.  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.
25.  When attempting to identify fetal heart motion, the frame rate of the real-time system should be
A.
B.
C.
D.
26.  Which of the following interation of sound and tissue decreases the intensity of the transmitted beam
A.
B.
C.
D.
E.
27.  True or FalseThe spatial pulse length usually decrease when operating frequency is changed to high
A.
B.
28.  Axial resolution is determined by which of the following?
A.
B.
C.
D.
E.
29.  True or False?The intensity of the ultrasound beam is increased by 4 times if the amplitude is doubled.
A.
B.
30.  True or False?The SPTA intensity will always be larger than the SATA intensity.
A.
B.
31.  What do you do when you want to decrease a very bright echoes on the display?
A.
B.
C.
D.
E.
32.  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.
33.  Increase the pulse repetition period
A.
B.
C.
D.
34.  The transducer that would be best suited for intercostal scanning is
A.
B.
C.
D.
35.  True or False?The synchronous signal processing uses a Doppler carrier frequency that is the same as the imaging center operating frequency
A.
B.
36.  True or False?An annular array scanner uses mechanical beam steering.
A.
B.
37.  Which of the following crystals will produce sound with the lowest frequency?
A.
B.
C.
D.
38.  An another term for nonspecular reflection is
A.
B.
C.
D.
E.
39.  Which of the following is not a component of the time-gain compensation (TGC) curve?
A.
B.
C.
D.
40.  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.
41.  The edge shadowing occurs in which of following situations
A.
B.
C.
D.
42.  Which of the following are you most likely to encounter when you scan a large fat mass
A.
B.
C.
D.
E.
43.  True or FalseThe frame rate of real-time scanners depends on the number of lines used to form the image.
A.
B.
44.  Which control would you adjust to alter the dynamic range of the displayed echoes?
A.
B.
C.
D.
E.
45.  One begins reading a color flow image by
A.
B.
C.
D.
46.  What happen to the reflected echo signal if you use a transducer with bandwidth between 2-5 MHz?
A.
B.
C.
D.
E.
47.  The ability to see deep vessels is limited by the fact that
A.
B.
C.
D.
48.  Cardiac color flow imaging is limited with a mechanical sector scanner because
A.
B.
C.
D.
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