Ultrasonography-physics-1

48 Questions  I  By Taofu2009la
Ultrasonography-physics-1
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1.  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.
2.  Relative measurement of intensity based on a logarithmic scale is expressed in:
A.
B.
C.
D.
E.
3.  The ability to see deep vessels is limited by the fact that
A.
B.
C.
D.
4.  True or False?A pulse with a long pulse duration is likely to have a narrow badwidth?
A.
B.
5.  What do you do when you want to decrease a very bright echoes on the display?
A.
B.
C.
D.
E.
6.  True or False?The SPTA intensity will always be larger than the SATA intensity.
A.
B.
7.  High frequency transducers have
A.
B.
C.
D.
8.  True or False?Lateral resolution improves with frequency.
A.
B.
9.  Snell's law refers to:
A.
B.
C.
D.
E.
10.  Power Doppler imaging is a good choice when you
A.
B.
C.
D.
11.  True or False?Electronically steered scanners always produce higher resolution images thant do mechanically steered scanners.
A.
B.
12.  A transducer with a large bandwidth is likely to have
A.
B.
C.
D.
13.  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.
14.  Which of the following is  the least obstacle (impedance) to the transmission of ultrasound?
A.
B.
C.
D.
15.  Cardiac color flow imaging is limited with a mechanical sector scanner because
A.
B.
C.
D.
16.  Hyperechoic region after a cyst filled with fluid is best explained by:
A.
B.
C.
D.
E.
17.  What happen to the reflected echo signal if you use a transducer with bandwidth between 2-5 MHz?
A.
B.
C.
D.
E.
18.  The mirror image artifact is commonly seen around which of the following structures?
A.
B.
C.
D.
19.  Diffraction refers to
A.
B.
C.
D.
20.  One begins reading a color flow image by
A.
B.
C.
D.
21.  An annular array real-time scanner
A.
B.
C.
D.
22.  Interference patterns of reflected waves causes
A.
B.
C.
D.
E.
23.  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.
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.  True or FalseElectronically steered scanners always produce higher resolution images than do mechanically steered scanners
A.
B.
26.  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.
27.  True or FalseThe frame rate of real-time scanners depends on the number of lines used to form the image.
A.
B.
28.  If you increase the pulse repetition frequency and leave all other controls unchanged, what will happen?
A.
B.
C.
D.
E.
29.  Bandwidth refers to:
A.
B.
C.
D.
E.
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?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.
32.  Axial resolution is determined by which of the following?
A.
B.
C.
D.
E.
33.  True or False?An annular array scanner uses mechanical beam steering.
A.
B.
34.  What is distinction between real-time scans and B-scans?
A.
B.
C.
D.
35.  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.
36.  Color flow imaging in the heart typically uses
A.
B.
C.
D.
37.  Which of the following is not user-adjustable?
A.
B.
C.
D.
E.
38.  Which of the following is not a component of the time-gain compensation (TGC) curve?
A.
B.
C.
D.
39.  What interaction of ultrasound and tissue  is primarily responsible for imaging the internal structure of organs?
A.
B.
C.
D.
E.
40.  The comet tail artifact can be seen posterior to an object that has
A.
B.
C.
D.
41.  Which of the following will not cause a redirection of part of the ultrasound energy?
A.
B.
C.
D.
E.
42.  Which of the following is true about the effect of frequency on Rayleigh scattering is true?
A.
B.
C.
D.
E.
43.  True or FalseAxial resolution is improved in the focal zone.
A.
B.
44.  An another term for nonspecular reflection is
A.
B.
C.
D.
E.
45.  Turbulence in a vascular color flow image appears as
A.
B.
C.
D.
46.  What occurs when you image a structure with oblique incidence?
A.
B.
C.
D.
E.
47.  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.
48.  True or False The frequency and wavelength  of a sound will change when it propagates through tissue.
A.
B.
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