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Ultrasonography-physics-1

48 Questions  I  By Taofu2009la
Sonography Quizzes & Trivia
Quiz to test your basic definion, concept and knowldge. It will increase your score by 20-50% in 2--4 weeks.

  
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1.  Which factor least influences axial resolution?
A.
B.
C.
D.
E.
2.  Turbulence in a vascular color flow image appears as
A.
B.
C.
D.
3.  True or False?An annular array scanner uses mechanical beam steering.
A.
B.
4.  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.
5.  Cardiac color flow imaging is limited with a mechanical sector scanner because
A.
B.
C.
D.
6.  Acoustic exposure can be changed by which of the following using pulsed-wave Doppler?
A.
B.
C.
D.
E.
7.  The mirror image artifact is commonly seen around which of the following structures?
A.
B.
C.
D.
8.  What is the purpose of curving the transducer elements or applying a lens over the elements?
A.
B.
C.
D.
E.
9.  If a 2-Mhz frequency is used in  human soft tissue, the wavelength is about
A.
B.
C.
D.
10.  The normal range of wave length in medical application  is
A.
B.
C.
D.
11.  Diffraction refers to
A.
B.
C.
D.
12.  True or False?The intensity of the ultrasound beam is increased by 4 times if the amplitude is doubled.
A.
B.
13.  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.
14.  What occurs when you image a structure with oblique incidence?
A.
B.
C.
D.
E.
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.  If you increase the pulse repetition frequency and leave all other controls unchanged, what will happen?
A.
B.
C.
D.
E.
17.  Snell's law refers to:
A.
B.
C.
D.
E.
18.  Interference patterns of reflected waves causes
A.
B.
C.
D.
E.
19.  Which of the following is not user-adjustable?
A.
B.
C.
D.
E.
20.  True or FalseThe frame rate of real-time scanners depends on the number of lines used to form the image.
A.
B.
21.  True or False?In a pulse-echo system, the quality factor should be made as large as possible.
A.
B.
22.  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.
23.  Which of the following is true about the effect of frequency on Rayleigh scattering is true?
A.
B.
C.
D.
E.
24.  The range of pulse repetition frequencies used in diagnostic ultrasound is
A.
B.
C.
D.
25.  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.
26.  Which of the following is  the least obstacle (impedance) to the transmission of ultrasound?
A.
B.
C.
D.
27.  True or FalseAxial resolution is improved in the focal zone.
A.
B.
28.  Hyperechoic region after a cyst filled with fluid is best explained by:
A.
B.
C.
D.
E.
29.  The shadow behind the stone can be best explained as which of following sound-tissue interaction?
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 FalseSmaller transducers always produce smaller beam diameters
A.
B.
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.  Which of the following is true?
A.
B.
C.
D.
34.  One begins reading a color flow image by
A.
B.
C.
D.
35.  True or False?Lateral resolution improves with frequency.
A.
B.
36.  Changes in the Doppler shift frequencies within a color flow image sample site appear in the image as
A.
B.
C.
D.
37.  Which of the following interation of sound and tissue decreases the intensity of the transmitted beam
A.
B.
C.
D.
E.
38.  True or FalseThe spatial pulse length usually decrease when operating frequency is changed to high
A.
B.
39.  The amount of energy transmitted and/or reflected at the boundary between two media depends on
A.
B.
C.
D.
40.  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.
41.  True or False?The SPTA intensity will always be larger than the SATA intensity.
A.
B.
42.  High frequency transducers have
A.
B.
C.
D.
43.  True or False?The synchronous signal processing uses a Doppler carrier frequency that is the same as the imaging center operating frequency
A.
B.
44.  True or False?Lateral resolution is decided by the beam diameter.
A.
B.
45.  True or False?A linear sequenced array cannot be dynamically focused.
A.
B.
46.  Beam steering is achieved in a linear phase array by
A.
B.
C.
D.
47.  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.
48.  True or FalseElectronically steered scanners always produce higher resolution images than do mechanically steered scanners
A.
B.
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