Ultrasonography-physics-1

48 Questions  I  By Taofu2009la
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1.  True or FalseThe frame rate of real-time scanners depends on the number of lines used to form the image.
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.  An another term for nonspecular reflection is
A.
B.
C.
D.
E.
4.  True or False?Mechanical transducers are mechanically steered (MS) and mechanically focused (MS).
A.
B.
5.  What occurs when you image a structure with oblique incidence?
A.
B.
C.
D.
E.
6.  Which control would you adjust to alter the dynamic range of the displayed echoes?
A.
B.
C.
D.
E.
7.  Based on range equation, which is necessary to calculate the distance to the reflector?
A.
B.
C.
D.
8.  True or False?The SPTA intensity will always be larger than the SATA intensity.
A.
B.
9.  One begins reading a color flow image by
A.
B.
C.
D.
10.  Which of the following is not user-adjustable?
A.
B.
C.
D.
E.
11.  True or False?A pulse with a long pulse duration is likely to have a narrow badwidth?
A.
B.
12.  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.
13.  Increase the pulse repetition period
A.
B.
C.
D.
14.  Changes in the Doppler shift frequencies within a color flow image sample site appear in the image as
A.
B.
C.
D.
15.  Which of the following crystals will produce sound with the lowest frequency?
A.
B.
C.
D.
16.  True or FalseAxial resolution is improved in the focal zone.
A.
B.
17.  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.
18.  True or False?In a pulse-echo system, the quality factor should be made as large as possible.
A.
B.
19.  Diffraction refers to
A.
B.
C.
D.
20.  High frequency transducers have
A.
B.
C.
D.
21.  The mirror image artifact is commonly seen around which of the following structures?
A.
B.
C.
D.
22.  Which of the following are you most likely to encounter when you scan a large fat mass
A.
B.
C.
D.
E.
23.  True or False?The synchronous signal processing uses a Doppler carrier frequency that is the same as the imaging center operating frequency
A.
B.
24.  A large, smooth interface is usually called
A.
B.
C.
D.
25.  Which of the following combinations of frequency and intensity would most likely result in cavitaion?
A.
B.
C.
D.
26.  Which of the following will not cause a redirection of part of the ultrasound energy?
A.
B.
C.
D.
E.
27.  Snell's law refers to:
A.
B.
C.
D.
E.
28.  A 10-dB difference in signal intensity is equivalent to  
A.
B.
C.
D.
29.  Cardiac color flow imaging is limited with a mechanical sector scanner because
A.
B.
C.
D.
30.  True or FalseThe spatial pulse length usually decrease when operating frequency is changed to high
A.
B.
31.  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.
32.  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.
33.  The range of pulse repetition frequencies used in diagnostic ultrasound is
A.
B.
C.
D.
34.  True or False?Lateral resolution improves with frequency.
A.
B.
35.  True or False?Electronically steered scanners always produce higher resolution images thant do mechanically steered scanners.
A.
B.
36.  What is distinction between real-time scans and B-scans?
A.
B.
C.
D.
37.  The shadow behind the stone can be best explained as which of following sound-tissue interaction?
A.
B.
C.
D.
E.
38.  True or FalseElectronically steered scanners always produce higher resolution images than do mechanically steered scanners
A.
B.
39.  Which of the following is  the least obstacle (impedance) to the transmission of ultrasound?
A.
B.
C.
D.
40.  The number of frames per second necessary for a real-time image to be flicker free is 
A.
B.
C.
D.
41.  Relative measurement of intensity based on a logarithmic scale is expressed in:
A.
B.
C.
D.
E.
42.  What happen to the reflected echo signal if you use a transducer with bandwidth between 2-5 MHz?
A.
B.
C.
D.
E.
43.  What happen to the reflected echo signal if you use a transducer with bandwidth between 2-5 MHz?
A.
B.
C.
D.
E.
44.  When attempting to identify fetal heart motion, the frame rate of the real-time system should be
A.
B.
C.
D.
45.  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.
46.  True or FalseSampling intervals for cardiac flow imaging and vascular flow imaging are similar
A.
B.
47.  True or False?A linear sequenced array cannot be dynamically focused.
A.
B.
48.  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.
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