Ultrasonography-physics-1

48 Questions  I  By Taofu2009la
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1.  True or False?A pulse with a long pulse duration is likely to have a narrow badwidth?
A.
B.
2.  True or False The frequency and wavelength  of a sound will change when it propagates through tissue.
A.
B.
3.  The amount of energy transmitted and/or reflected at the boundary between two media depends on
A.
B.
C.
D.
4.  Interference patterns of reflected waves causes
A.
B.
C.
D.
E.
5.  True or False?The SPTA intensity will always be larger than the SATA intensity.
A.
B.
6.  What is distinction between real-time scans and B-scans?
A.
B.
C.
D.
7.  True or FalseSmaller transducers always produce smaller beam diameters
A.
B.
8.  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.
9.  If a 2-Mhz frequency is used in  human soft tissue, the wavelength is about
A.
B.
C.
D.
10.  True or FalseThe spatial pulse length usually decrease when operating frequency is changed to high
A.
B.
11.  The edge shadowing occurs in which of following situations
A.
B.
C.
D.
12.  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.
13.  True or False?Lateral resolution improves with frequency.
A.
B.
14.  Which of the following is true?
A.
B.
C.
D.
15.  True or FalseElectronically steered scanners always produce higher resolution images than do mechanically steered scanners
A.
B.
16.  A large, smooth interface is usually called
A.
B.
C.
D.
17.  Hyperechoic region after a cyst filled with fluid is best explained by:
A.
B.
C.
D.
E.
18.  What happen to the reflected echo signal if you use a transducer with bandwidth between 2-5 MHz?
A.
B.
C.
D.
E.
19.  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.
20.  Which of the following interation of sound and tissue decreases the intensity of the transmitted beam
A.
B.
C.
D.
E.
21.  An annular array real-time scanner
A.
B.
C.
D.
22.  True or FalseThe frame rate of real-time scanners depends on the number of lines used to form the image.
A.
B.
23.  True or False?Mechanical transducers are mechanically steered (MS) and mechanically focused (MS).
A.
B.
24.  Both the color and a point spectrum in a stenosis show high-frequency aliasing, one strategy for removing the aliasing involes
A.
B.
C.
D.
25.  Turbulence in a vascular color flow image appears as
A.
B.
C.
D.
26.  Which factor least influences axial resolution?
A.
B.
C.
D.
E.
27.  The number of frames per second necessary for a real-time image to be flicker free is 
A.
B.
C.
D.
28.  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.
29.  True or False?Electronically steered scanners always produce higher resolution images thant do mechanically steered scanners.
A.
B.
30.  Which of the following combinations of frequency and intensity would most likely result in cavitaion?
A.
B.
C.
D.
31.  Which of the following is least likely cause for attenuation?
A.
B.
C.
D.
32.  The ability to see deep vessels is limited by the fact that
A.
B.
C.
D.
33.  True or False?In a pulse-echo system, the quality factor should be made as large as possible.
A.
B.
34.  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.
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.  One begins reading a color flow image by
A.
B.
C.
D.
37.  Cardiac color flow imaging is limited with a mechanical sector scanner because
A.
B.
C.
D.
38.  Which of the following is not a component of the time-gain compensation (TGC) curve?
A.
B.
C.
D.
39.  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.
40.  Which of the following are you most likely to encounter when you scan a large fat mass
A.
B.
C.
D.
E.
41.  True or False?A linear sequenced array cannot be dynamically focused.
A.
B.
42.  What is the purpose of curving the transducer elements or applying a lens over the elements?
A.
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 comet tail artifact can be seen posterior to an object that has
A.
B.
C.
D.
45.  True or FalseAxial resolution is improved in the focal zone.
A.
B.
46.  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.
47.  An another term for nonspecular reflection is
A.
B.
C.
D.
E.
48.  Color flow imaging in the heart typically uses
A.
B.
C.
D.
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