問題一覧
1
which of the following transducers would be preferred for breast imaging
C) 12 MHz linear array
2
which of the following console controls allows for comparison of imaging of two different locations at the same time
A) dual screen
3
Which of the following describes a multi dimensional array?
D) has thousands of elements arranged in a matrix pattern
4
Materials used for the matching layer of a transducer must have an impedance between impedance levels of
A) skin and PE element
5
which of the following terms can be used to describe the waveform displayed
A) low resistance
6
The grayscale map is adjusted to a new map just after freezing the image this is an example of
C) applying postprocessing
7
Spatial compounding
A) can decrease the appearance of useful artifacts, such as enhancement and shadowing
8
What Doppler artifact is demonstrated on the tracing?
D) cross talk
9
reducing the size of the field of view improves ____ resolution
D) temporal
10
how many shades of grey will a 6 bit system display?
C) 64
11
A _____ is an audible sign of turbulence in a vessel. A _____ is an audible sign of turbulence in the heart
D) bruit, murmur
12
which of The following will cause an object to be displayed in an improper location or at an incorrect size
B) refraction
13
increasing overall gain will
B) increase the amplitude of all the reflectors on the image
14
____ is used to improve the signal-to-noise ratio on color, Doppler image and is defined as the averaging of previous image frames to produce the newest frame
C) persistence
15
an ultrasound beam with a transmitted frequency of 5 MHz moves through a soft tissue. Doppler ultrasound is used to evaluate a blood vessel a red blood cell is moving perpendicular to the beam at a speed of 15 m/s what will be the recorded Doppler shift?
D) 0 MHz
16
which of the following information should never be entered into the ultrasound system as a patient identifier prior to start the exam
A) social security number
17
which of the following transducers reproduce the highest frequency sound waves?
A) 2mm element thickness, 6mm/us prop speed of the element
18
what imaging phenomenon is demonstrated on the video
A) spontaneous contrast
19
as you were scanning an obese adult patient you noticed a 0.7 thermal index or should you do next?
A) continue scanning and complete the full exam effectively to reduce exposure time
20
increasing the image size will increase the number of pixels in the real time image indicates
C) write magnification
21
amplification of the received signal occurs in the
B) beam former
22
The __ the pulse packet used in color Doppler, the better the flow sensitivity
B) larger
23
which of the following is an advantage of the new Capacitive Micromachine ultrasonic transducers compared to traditional transducer arrays
D) a wider bandwidth and improved detail resolution
24
use your cursor to measure the peak systolic velocity of the third wave form
blue dot ( peak = top )
25
The first step in any contrast exam is
A) optimize the 2D image
26
which of the following acoustic artifacts is demonstrated on the image?
B) mirror image
27
scatter is defined as
C) redirection of sound beam in several directions away from the transducer
28
which of the following factors affect the focal length of the transducer?
C) element diameter and frequency
29
what system component is responsible for 3-D image acquisition and presentation
C) image processor
30
If the incident beam angle is 25° what is the angle of reflection
A) 25°
31
as frequency increases the amount of scatter ____
A) increases
32
A linear transducer providing a trapezoidal image demonstrates degraded ____ resolution in the far field of the image
B) lateral
33
Frame rates can be improved by the use of what signal processing technique
B) parallel processing
34
Linear phased arrays utilize what type of focusing
D) mechanical and electronic
35
____ is an increase in the strength of returning echoes caused by intervening structures of low attenuation
D) enhancement
36
Harmonic imaging leads to
C) decreased image clutter
37
if you set the gain to the lowest level and slowly increase it until an echo is identified on the image. What are you evaluating on the ultrasound system?
C) minimum sensitivity
38
which of the following terms can be used to describe the attached Doppler tracing
D) spectral broadening
39
which of the following transducer provides the best spatial resolution of the cardiac structures
D) transesophageal array
40
which of the following system controls is used mainly in cardiac imaging to correct for dropout on the sides of the image
C) lateral gain
41
The amount of compensation necessary for different echoes varies with reflector
C) depth
42
what adjustments can be made to improve the attached image of the Doppler tracing to make it of diagnostic quality
A) lower the baseline
43
If 60% of the beam is transmitted what percent is reflected to the transducer
B) 40%
44
if media one has an impedance of 65 rayls media two also has an impedance of 65 rayls what percent of the beam will be reflected at their interface?
C) 0%
45
A Doppler shift of 1.5 kHz is detected in an artery. if the velocity of the blood flow doubles, what is the new Doppler shift detected?
C) 3kHz
46
which statement is true regarding the Q factor
D) better axial resolution is seen with shorter spatial pulse lengths and low Q factor
47
note the Doppler measurement on the image what other Doppler measurement should be taken to calculate the resistive index?
D) end diastolic velocity
48
if the stenosis or blockage reduces the vessel lumen to 1/4 of the normal vessel area at the velocity of flow at the stenosis must ___ to maintain the flow rate
A) quadruple
49
____ refers to the process of steering the scan lines in multiple views to evaluate tissues with several pulses with varied incident angles
D) spatial compounding
50
which of the following beam intensity values is used to assess potential patient exposure
C) SPTA
51
which of the following is a variable necessary to quantify the Doppler shift
B) transducer frequency
52
increasing the spectral Doppler sample size will increase the ____
A) spectral broadening
53
if a renal artery, Doppler exam demonstrates normal flow, but stenosis is identified on angiography valuation the ultrasound results are described as
B) false negative
54
when using a tissue phantom to evaluate range accuracy, what unit will be used to report the measurement
D) centimeter
55
which of the following is directly related to the peak Doppler shift?
B) transducer frequency
56
What is the proper procedure for removing soiled gloves?
D) pull the outer cuff of the first glove toward the fingers while turning it inside out. place the remove glove in the contralateral gloved hand and pull the outer cuff of the second glove toward the fingers while turning it inside out and enclosing the first glove
57
The term used to describe the thickness of blood is
B) viscosity
58
blood is moving toward a 7 MHz transducer you expect the reflected frequency to be ____ 7 Mhz
A) greater than
59
if you are performing an abdominal exam but inadvertently select the carotid preset on the machine how will this affect your exam?
B) depth will be very superficial causing potential non-visualizations of abdominal structures
60
which of the following requires healthcare providers and organizations to develop and follow procedures that ensure the confidentiality and security of protected health information
D) health insurance portability an accountability act
61
when the sonographer decreases the imaging depth the ____
B) PRF will increase
62
The AIUM recommends that the thermal index for fetal imaging be maintained at a level at or below
D) 0.7
63
range resolution of a pulse wave system is determined by
D) both the source and medium
64
if the reflector is moving away from the stationary sound source the reflected wave will
B) have a lower frequency than the transmitted frequency
65
Which of the following techniques is described as a graphic representation of the motion of a structure over time?
D) M-mode
66
which of the following is a function of the pulser used to increase the signal-to-noise ratio
C) coded excitation
67
which of the following is true regarding signal-to-noise ratio
D) a high signal-to-noise ratio image is preferred over a low signal-to-noise ratio image
68
Range Equation: distance to reflector =
A) propagation speed x 1/2 (time to and from reflector)
69
which of the following parameters is displayed as the X- axis on a doppler tracing
B) time
70
which of the following is an advantage of virtual beam forming ( VBF) over traditional pulse echo imaging (PEI)
A) VBF allows for simultaneously real time grayscale, color, and spectral display
71
____ Determines the acoustic power of the transducer
A) the magnitude of the voltage spike
72
volume averaging artifact is greatest in
C) deep lesions
73
Which of the following will increase the amount of color displayed in a vessel located deep in the body?
D) increase frame rate
74
The arrow indicates what ultrasound phenomenon
A) clutter
75
no flow is detected while performing a color Doppler evaluation of a normal patent vein what will improve the color display?
D) decrease the sample size
76
When transmural pressure in a vein is high
D) the vein becomes enlarged and rounded
77
which of the following is related to the elevated peak rarefactional pressure in a sound beam
C) cavitation
78
What portion of the TGC curve is the deepest region attenuation compensation can occur
C) knee
79
what is a twinkle artifact?
B) mosaic colors displayed in a linear pattern and posterior to a dense object such as a renal stone
80
when estimating hydrostatic pressure every inch of blood in a column equates to
D) 2 mmHg
81
which of the following is necessary machine setting when performing a contrast elevation of the heart
A) low mechanical index value
82
Which of the following statements is true regarding equipment preparation for beginning in an ultrasound exam
A) adjust the height of the chair to allow your wrist to be fully extended while scanning
83
which Image demonstrates ring down artifact
A
84
which of the following will reduce the amount of color Doppler information displayed on the image
C) increased sample size
85
when evaluating a suspected arterial stenosis, a Doppler angle of ____ degrees will produce the most accurate flow velocity
A) 0
86
which of the following correctly describes a CW Doppler evaluation
C) CW Doppler tracings will not demonstrate a spectral window
87
increasing scan line density leads to improved ___ resolution
C) spatial
88
Which of the following persistence level should be used to optimize color doppler imaging of cardiac structures
B) Low
89
How is focusing performed using the reflected portion of the beam?
B) varying the number of PE elements used to receive the reflected echoes
90
The rectus abdominis muscles are associated with ____ while the diaphragm is associated with ____
A) refraction artifact, mirror image artifact
91
what term indicates the phenomenon of PW doppler tracing displaying a wider distribution of the velocity of blood cells with varying degrees of arterial blockage
D) spectral broadening
92
you are using a 5 MHz transducer to perform pulse wave doppler on the carotid arteries. you change to a 7.5 MHz continuous wave doppler transducer to evaluate blood flow how will this affect the propagation speed in soft tissue of the neck
B) remain constant
93
Which of the following increases at an arterial stenosis
B) resistance and velocity
94
which of the following transducers is capable of electronic beam steering?
D) curvilinear phased array
95
slice thickness artifact can result in
B) the appearance of debris in an anechoic structure
96
what is the correct order for removal of personal protective equipment
B) gloves, goggles, gown, mask
97
what effect does frequency compounding have on the image
A) reduce speckle artifact
98
If blood pressure increases with no change in resistance what happens
C) increased flow rate
99
which of the following can reduce or eliminate range ambiguity artifact
A) decreasing the PRF
100
Transmit Delay or Receive Focusing improves ____ resolution
D) lateral