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Ultrasonography-physics-1

48 Questions  I  By Taofu2009la
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1.  Which of the following is  the least obstacle (impedance) to the transmission of ultrasound?
A.
B.
C.
D.
2.  True or FalseThe spatial pulse length usually decrease when operating frequency is changed to high
A.
B.
3.  Diffraction refers to
A.
B.
C.
D.
4.  True or FalseThe frame rate of real-time scanners depends on the number of lines used to form the image.
A.
B.
5.  The amount of energy transmitted and/or reflected at the boundary between two media depends on
A.
B.
C.
D.
6.  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.
7.  What is the purpose of curving the transducer elements or applying a lens over the elements?
A.
B.
C.
D.
E.
8.  Relative measurement of intensity based on a logarithmic scale is expressed in:
A.
B.
C.
D.
E.
9.  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.
10.  Bandwidth refers to:
A.
B.
C.
D.
E.
11.  The number of frames per second necessary for a real-time image to be flicker free is 
A.
B.
C.
D.
12.  Color flow imaging in the heart typically uses
A.
B.
C.
D.
13.  The mirror image artifact is commonly seen around which of the following structures?
A.
B.
C.
D.
14.  The comet tail artifact can be seen posterior to an object that has
A.
B.
C.
D.
15.  True or FalseSmaller transducers always produce smaller beam diameters
A.
B.
16.  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.
17.  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.
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?In general, tissue ultrasonic intensity levels are higher for single-point spectra than for color flow imaging with the same system.
A.
B.
20.  Pulsing of the transmitted sound wave is necessary for real-time imaging because:
A.
B.
C.
D.
E.
21.  Axial resolution is determined by which of the following?
A.
B.
C.
D.
E.
22.  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.
23.  Which of the following is not user-adjustable?
A.
B.
C.
D.
E.
24.  Which factor least influences axial resolution?
A.
B.
C.
D.
E.
25.  Increase the pulse repetition period
A.
B.
C.
D.
26.  A transducer with a large bandwidth is likely to have
A.
B.
C.
D.
27.  Cardiac color flow imaging is limited with a mechanical sector scanner because
A.
B.
C.
D.
28.  A large, smooth interface is usually called
A.
B.
C.
D.
29.  True or False?Electronically steered scanners always produce higher resolution images thant do mechanically steered scanners.
A.
B.
30.  True or False?The synchronous signal processing uses a Doppler carrier frequency that is the same as the imaging center operating frequency
A.
B.
31.  Which of the following is true?
A.
B.
C.
D.
32.  Based on range equation, which is necessary to calculate the distance to the reflector?
A.
B.
C.
D.
33.  True or FalseAxial resolution is improved in the focal zone.
A.
B.
34.  The number of frames per second necessary for a real-time image to be flicker free is
A.
B.
C.
D.
35.  What occurs when you image a structure with oblique incidence?
A.
B.
C.
D.
E.
36.  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.
37.  True or FalseElectronically steered scanners always produce higher resolution images than do mechanically steered scanners
A.
B.
38.  One begins reading a color flow image by
A.
B.
C.
D.
39.  Which of the following will not cause a redirection of part of the ultrasound energy?
A.
B.
C.
D.
E.
40.  What is distinction between real-time scans and B-scans?
A.
B.
C.
D.
41.  An annular array real-time scanner
A.
B.
C.
D.
42.  Beam steering is achieved in a linear phase array by
A.
B.
C.
D.
43.  What do you do when you want to decrease a very bright echoes on the display?
A.
B.
C.
D.
E.
44.  True or False?Lateral resolution improves with frequency.
A.
B.
45.  What happen to the reflected echo signal if you use a transducer with bandwidth between 2-5 MHz?
A.
B.
C.
D.
E.
46.  True or False?In a pulse-echo system, the quality factor should be made as large as possible
A.
B.
47.  An another term for nonspecular reflection is
A.
B.
C.
D.
E.
48.  Which of the following combinations of frequency and intensity would most likely result in cavitaion?
A.
B.
C.
D.
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