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Ultrasonography-physics-1

48 Questions  I  By Taofu2009la
Sonography Quizzes & Trivia
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1.  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.
2.  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.
3.  True or FalseImaging transducers are usually of high rather than low bandwidth.
A.
B.
4.  A transducer with a large bandwidth is likely to have
A.
B.
C.
D.
5.  True or FalseSmaller transducers always produce smaller beam diameters
A.
B.
6.  Beam steering is achieved in a linear phase array by
A.
B.
C.
D.
7.  What happen to the reflected echo signal if you use a transducer with bandwidth between 2-5 MHz?
A.
B.
C.
D.
E.
8.  Which of the following is true about the effect of frequency on Rayleigh scattering is true?
A.
B.
C.
D.
E.
9.  What is distinction between real-time scans and B-scans?
A.
B.
C.
D.
10.  Color flow imaging in the heart typically uses
A.
B.
C.
D.
11.  Snell's law refers to:
A.
B.
C.
D.
E.
12.  Which of the following are you most likely to encounter when you scan a large fat mass
A.
B.
C.
D.
E.
13.  Which factor least influences axial resolution?
A.
B.
C.
D.
E.
14.  What occurs when you image a structure with oblique incidence?
A.
B.
C.
D.
E.
15.  True or False?An annular array scanner uses mechanical beam steering.
A.
B.
16.  Bandwidth refers to:
A.
B.
C.
D.
E.
17.  What best describes the difference between the ultrasound frequencies used for Doppler and for B-mode imaging with a given transducer?
A.
B.
C.
D.
E.
18.  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.
19.  Turbulence in a vascular color flow image appears as
A.
B.
C.
D.
20.  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.
21.  Cardiac color flow imaging is limited with a mechanical sector scanner because
A.
B.
C.
D.
22.  Diffraction refers to
A.
B.
C.
D.
23.  Pulsing of the transmitted sound wave is necessary for real-time imaging because:
A.
B.
C.
D.
E.
24.  True or False?Mechanical transducers are mechanically steered (MS) and mechanically focused (MS).
A.
B.
25.  Increase the pulse repetition period
A.
B.
C.
D.
26.  Which of the following is not user-adjustable?
A.
B.
C.
D.
E.
27.  The amount of energy transmitted and/or reflected at the boundary between two media depends on
A.
B.
C.
D.
28.  The mirror image artifact is commonly seen around which of the following structures?
A.
B.
C.
D.
29.  The shadow behind the stone can be best explained as which of following sound-tissue interaction?
A.
B.
C.
D.
E.
30.  True or False?The SPTA intensity will always be larger than the SATA intensity.
A.
B.
31.  True or False?Lateral resolution improves with frequency.
A.
B.
32.  True or False?A linear sequenced array cannot be dynamically focused.
A.
B.
33.  One begins reading a color flow image by
A.
B.
C.
D.
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.  What interaction of ultrasound and tissue  is primarily responsible for imaging the internal structure of organs?
A.
B.
C.
D.
E.
36.  Which of the following interation of sound and tissue decreases the intensity of the transmitted beam
A.
B.
C.
D.
E.
37.  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.
38.  An another term for nonspecular reflection is
A.
B.
C.
D.
E.
39.  The number of frames per second necessary for a real-time image to be flicker free is 
A.
B.
C.
D.
40.  True or FalseThe spatial pulse length usually decrease when operating frequency is changed to high
A.
B.
41.  True or False?Electronically steered scanners always produce higher resolution images thant do mechanically steered scanners.
A.
B.
42.  Which of the following is not a component of the time-gain compensation (TGC) curve?
A.
B.
C.
D.
43.  A transducer with a large bandwidth is likely to have
A.
B.
C.
D.
44.  When attempting to identify fetal heart motion, the frame rate of the real-time system should be
A.
B.
C.
D.
45.  Based on range equation, which is necessary to calculate the distance to the reflector?
A.
B.
C.
D.
46.  Which of the following crystals will produce sound with the lowest frequency?
A.
B.
C.
D.
47.  True or False?In a pulse-echo system, the quality factor should be made as large as possible
A.
B.
48.  Which of the following is true?
A.
B.
C.
D.
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