Ultrasonography-physics-1

48 Questions  I  By Taofu2009la on January 17, 2010
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.  True or False?Electronically steered scanners always produce higher resolution images thant do mechanically steered scanners.
A.
B.
2.  What do you do when you want to decrease a very bright echoes on the display?
A.
B.
C.
D.
E.
3.  What interaction of ultrasound and tissue  is primarily responsible for imaging the internal structure of organs?
A.
B.
C.
D.
E.
4.  True or False?The synchronous signal processing uses a Doppler carrier frequency that is the same as the imaging center operating frequency
A.
B.
5.  The transducer that would be best suited for intercostal scanning is
A.
B.
C.
D.
6.  The mirror image artifact is commonly seen around which of the following structures?
A.
B.
C.
D.
7.  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.
8.  The range of pulse repetition frequencies used in diagnostic ultrasound is
A.
B.
C.
D.
9.  The edge shadowing occurs in which of following situations
A.
B.
C.
D.
10.  Which of the following is true about the effect of frequency on Rayleigh scattering is true?
A.
B.
C.
D.
E.
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.
C.
D.
E.
12.  True or False?In a pulse-echo system, the quality factor should be made as large as possible.
A.
B.
13.  The number of frames per second necessary for a real-time image to be flicker free is 
A.
B.
C.
D.
14.  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.
15.  True or FalseThe frame rate of real-time scanners depends on the number of lines used to form the image.
A.
B.
16.  If a 2-Mhz frequency is used in  human soft tissue, the wavelength is about
A.
B.
C.
D.
17.  True or False?The SPTA intensity will always be larger than the SATA intensity.
A.
B.
18.  Which of the following is least likely cause for attenuation?
A.
B.
C.
D.
19.  Which control would you adjust to alter the dynamic range of the displayed echoes?
A.
B.
C.
D.
E.
20.  An annular array real-time scanner
A.
B.
C.
D.
21.  Which of the following combinations of frequency and intensity would most likely result in cavitaion?
A.
B.
C.
D.
22.  True or False?An annular array scanner uses mechanical beam steering.
A.
B.
23.  What is the purpose of curving the transducer elements or applying a lens over the elements?
A.
B.
C.
D.
E.
24.  A 10-dB difference in signal intensity is equivalent to  
A.
B.
C.
D.
25.  Relative measurement of intensity based on a logarithmic scale is expressed in:
A.
B.
C.
D.
E.
26.  True or False?A pulse with a long pulse duration is likely to have a narrow badwidth?
A.
B.
27.  A transducer with a large bandwidth is likely to have
A.
B.
C.
D.
28.  Acoustic exposure can be changed by which of the following using pulsed-wave Doppler?
A.
B.
C.
D.
E.
29.  Axial resolution is determined by which of the following?
A.
B.
C.
D.
E.
30.  True or False?Mechanical transducers are mechanically steered (MS) and mechanically focused (MS).
A.
B.
31.  What occurs when you image a structure with oblique incidence?
A.
B.
C.
D.
E.
32.  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.
33.  True or False The frequency and wavelength  of a sound will change when it propagates through tissue.
A.
B.
34.  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.
35.  High frequency transducers have
A.
B.
C.
D.
36.  True or False?The intensity of the ultrasound beam is increased by 4 times if the amplitude is doubled.
A.
B.
37.  Color flow imaging in the heart typically uses
A.
B.
C.
D.
38.  True or FalseElectronically steered scanners always produce higher resolution images than do mechanically steered scanners
A.
B.
39.  Which of the following crystals will produce sound with the lowest frequency?
A.
B.
C.
D.
40.  Which of the following interation of sound and tissue decreases the intensity of the transmitted beam
A.
B.
C.
D.
E.
41.  What system control can you adjust to compensate for the effect of sound attenuation  in the body
A.
B.
C.
D.
E.
42.  A transducer with a large bandwidth is likely to have
A.
B.
C.
D.
43.  True or FalseAxial resolution is improved in the focal zone.
A.
B.
44.  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.
45.  Which of the following is not a component of the time-gain compensation (TGC) curve?
A.
B.
C.
D.
46.  If you increase the pulse repetition frequency and leave all other controls unchanged, what will happen?
A.
B.
C.
D.
E.
47.  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.
48.  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.
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