Ultrasonography-physics-1

48 Questions  I  By Taofu2009la
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Sonography Quizzes & Trivia
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1.  The amount of energy transmitted and/or reflected at the boundary between two media depends on
A.
B.
C.
D.
2.  True or False?Grating lobes are essential for the proper operation of a linear phased array.
A.
B.
3.  The edge shadowing occurs in which of following situations
A.
B.
C.
D.
4.  Acoustic exposure can be changed by which of the following using pulsed-wave Doppler?
A.
B.
C.
D.
E.
5.  Which of the following will not cause a redirection of part of the ultrasound energy?
A.
B.
C.
D.
E.
6.  Axial resolution is determined by which of the following?
A.
B.
C.
D.
E.
7.  True or False?A pulse with a long pulse duration is likely to have a narrow badwidth?
A.
B.
8.  Which of the following interation of sound and tissue decreases the intensity of the transmitted beam
A.
B.
C.
D.
E.
9.  What is the purpose of curving the transducer elements or applying a lens over the elements?
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B.
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D.
E.
10.  True or FalseSmaller transducers always produce smaller beam diameters
A.
B.
11.  If the number of cycles in a pulse is increased but the wavelength remains the same, which of the following is true?
A.
B.
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D.
E.
12.  Hyperechoic region after a cyst filled with fluid is best explained by:
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B.
C.
D.
E.
13.  Relative measurement of intensity based on a logarithmic scale is expressed in:
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B.
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D.
E.
14.  Which of the following is  the least obstacle (impedance) to the transmission of ultrasound?
A.
B.
C.
D.
15.  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.
16.  Bandwidth refers to:
A.
B.
C.
D.
E.
17.  True or False?Electronically steered scanners always produce higher resolution images thant do mechanically steered scanners.
A.
B.
18.  Increase the pulse repetition period
A.
B.
C.
D.
19.  Which of the following is not user-adjustable?
A.
B.
C.
D.
E.
20.  What is distinction between real-time scans and B-scans?
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B.
C.
D.
21.  A transducer with a large bandwidth is likely to have
A.
B.
C.
D.
22.  A transducer with a large bandwidth is likely to have
A.
B.
C.
D.
23.  Pulsing of the transmitted sound wave is necessary for real-time imaging because:
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B.
C.
D.
E.
24.  What occurs when you image a structure with oblique incidence?
A.
B.
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D.
E.
25.  When attempting to identify fetal heart motion, the frame rate of the real-time system should be
A.
B.
C.
D.
26.  True or False?A linear sequenced array cannot be dynamically focused.
A.
B.
27.  True or False?An annular array scanner uses mechanical beam steering.
A.
B.
28.  What interaction of ultrasound and tissue  is primarily responsible for imaging the internal structure of organs?
A.
B.
C.
D.
E.
29.  A large, smooth interface is usually called
A.
B.
C.
D.
30.  The comet tail artifact can be seen posterior to an object that has
A.
B.
C.
D.
31.  High frequency transducers have
A.
B.
C.
D.
32.  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.
33.  What happen to the reflected echo signal if you use a transducer with bandwidth between 2-5 MHz?
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B.
C.
D.
E.
34.  True or False?Lateral resolution is decided by the beam diameter.
A.
B.
35.  Which control would you adjust to alter the dynamic range of the displayed echoes?
A.
B.
C.
D.
E.
36.  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.
37.  The transducer that would be best suited for intercostal scanning is
A.
B.
C.
D.
38.  True or FalseAxial resolution is improved in the focal zone.
A.
B.
39.  True or FalseSampling intervals for cardiac flow imaging and vascular flow imaging are similar
A.
B.
40.  True or False?In a pulse-echo system, the quality factor should be made as large as possible.
A.
B.
41.  An another term for nonspecular reflection is
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B.
C.
D.
E.
42.  Interference patterns of reflected waves causes
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B.
C.
D.
E.
43.  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.
44.  The number of frames per second necessary for a real-time image to be flicker free is 
A.
B.
C.
D.
45.  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.
46.  True or False?The synchronous signal processing uses a Doppler carrier frequency that is the same as the imaging center operating frequency
A.
B.
47.  Q factor refers to
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B.
C.
D.
48.  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.
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