問題一覧
1
The recommended sample size for PW Doppler evaluation of an artery is
C) 1-1.5mm
2
____ is the percentage of time the transducer is transmitting sound waves
C) Duty Factor
3
Increasing transmit output power will increase the risk of bioeffects and
D) the signal to noise ratio
4
A disadvantage of increasing edge enhancement is
A) amplifies echoes related to noise and speckle
5
Blood flows from a large vessel into smaller collateral vessel when
C) resistance is lower in the smaller vessel than the large vessel
6
which of the following image controls can be adjusted to produce a smoother color doppler image
D) persistence
7
Which of the following describes the correct way to measure the acceleration time on a Doppler waveform
B) place a caliper at the onset of the systolic upstroke and at the systolic peak
8
When the color scale is increased, what other setting automatically increases along with it
D) wall filter
9
when you activate harmonic imaging and add a focal zone to the field of view which type of resolution will degrade with these changes
A) temporal
10
Which of the following statements is correct regarding inspecting an endocavity probe for a potential electrical hazard
D) normal use of disinfecting agents can lead to damage of the probe coding which will cause a risk of electrical hazard
11
what console control should be adjusted to improve the image
D) more than one of the above
12
____ removes low amplitude signals and noise from the image
A) increasing rejection
13
____ can be used to reduced image noise and clutter on the 2D image
C) spatial compounding
14
Which of the following will improve lateral resolution at all depths on the image
D) dynamic receive focusing
15
Which of the following artifacts cause the appearance of false echoes beside the actual structure on the image
B) lobe artifacts and refraction artifacts
16
When transporting a patient in a wheelchair with an IV bag
A) you should always transport the IV bag above the level of the patient’s heart
17
The tissue phantom pins in the area listed as #4 are used to evaluate which of the following parameters
D) horizontal calibration
18
which of the following exams would require the storage of a 2-3 second digital clip of the real time image
D) evaluation of the wall motion of the left ventricle
19
The CDC recommends the use of ____ for hand hygiene, except when the hands are visibly soiled
B) alcohol based hand rub
20
what doppler artifact results is unwanted reflected information from locations other than the desired sample location
C) range ambiguity
21
Which of the following statements is true regarding pulse inversion images
C) reduces frame rate compared to standard 2D imaging
22
Which of the following will not change with an increase in gain setting?
D) signal-to-noise ratio
23
Which of the following console controls can be used to increase the number of scan lines used in a color image
B) persistence
24
what can be done to reduce the color Doppler artifact demonstrated on the image
A) reduce color gain
25
which of the following machine settings should be adjusted first to improve the color doppler image
D) increase color Doppler gain
26
Blood flow that varies with respiration is described as
C) phasic
27
Changing the color flow Doppler velocity scale alters the
B) pulse repetition frequency
28
What type of transducer produced in the image
D) curved phased array
29
which law of physics describes the refraction of sound at the boundary between two media with different propagation speeds
D) Snell’s Law
30
If the amplitude of a wave is decreased by one half the intensity ___
B) decreases to 1/4 original intensity
31
Changing the color flow doppler velocity scale alters the
C) pulse repetition frequency
32
Anemia will ___ blood flow velocities detected on Doppler evaluation
B) increase
33
As frequency increases the axial resolution will
A) improve
34
if the frequency of the beam increases the propagation speed in the media will
C) not change
35
Decreasing the width of the color sample to 50% of the original size will have what effect on the frame rate
C) increase by 50%
36
which of the following will increase the risk of aliasing
D) increasing transmit frequency
37
List the parts of the beam former in the order they function to produce and receive sound waves
B) pulser, pulse delays, transmit/receive switch, amplifier, analog-to-digital converter, echo delays, summer
38
which of the following correctly describes dynamic receive focusing
B) allows focusing at multiple depths on the image
39
which of the following variables has the most significant effect on propagation speed
A) stiffness
40
Which of the following describes the best way to improve the recorded image of the liver
B) decrease the imaging depth by 5 cm
41
which of the following describes an important reason to verify the ultrasound examination that is ordered is the exam that should really be performed
B) when the suspected diagnosis is not able to be evaluated by the exam that is ordered
42
What can be done to reduce the spectral broadening on the image?
B) decrease Doppler gain
43
Diffuse reflection
B) occurs when the beam strikes a large rough surface
44
When preparing the sterile tray for an invasive procedure the cover on the tray should be opened
D) by pulling the far corner of the wrapper toward you
45
A carotid Doppler exam was performed last year using a 10 MHz transducer and this year the exam was performed with a 5 MHz transducer, assuming no change in the level stenosis in the arteries and the same Doppler angle is used how will the change in transducer frequency affect the velocity information on today’s exam
C) the transducer frequency does not affect the calculated flow velocity
46
What technique is used to reduce lobe artifact?
A) subdicing
47
Which of the following describes a normal result for uniformity testing of the ultrasound system
B) TGC set to produce an image with equal echo amplitude across the screen and then when the TGC function is turned off the echoes in the far field are reduced in amplitude
48
Which of the following correctly describes the duty factor of an ultrasound system
D) duty factor refers to the amount of time soundwaves are being produced
49
A 5 MHz transducer has a PRF of 6 kHz and is being used to produce a wave with a 0.6 mm wave length and a 3 mm spatial pulse length what is the axial resolution of the system?
D) 1.5 mm
50
Which of the following will increase the risk of aliasing
A) increasing transmit frequency
51
Axial resolution is primarily dependent upon
A) pulse duration
52
Which of the following is a function of the signal processor
C) filtering and compression
53
which of the following describes the primary advantage of a 1.5 D array over a 1 D array
D) the 1.5 array allows for variable elevation focus while 1 D array has a fixed elevation focus
54
Which of the following describes the type of focusing used in an annular phased array
B) focusing at multiple levels across all depths of the image
55
When reporting spectral Doppler information the sonographer must
C) record the highest quality and highest velocity signals for the final measurements
56
Increasing the number of bits assigned to a pixel will
A) allow for the display of more shades of gray
57
When a patient stands up, what is the hydrostatic pressure at the ankles?
C) 100 mmHg
58
As the cross-sectional area of a blood vessel increases what happens to the velocity of the blood flow
C) decreases
59
___ occurs posterior to highly attenuating structures
A) shadowing
60
Which type of transducer will be used to evaluate a palpable lump in the neck
C) 12 MHz linear phased array
61
Increasing the sector size increases
A) the number of pulses per image
62
Which of the following is the best way to improve the lateral resolution of the image?
A) turn off the trapezoid field of view
63
The unit used for attenuation coefficient is
B) dB/cm
64
You are evaluating an obese patient with a known abdominal aortic aneurysm while using color Doppler to assess flow within the aortic aneurysm. Minimal flow is detected in an anechoic lumen. You decrease the color scale increase the color gain but there is no improvement which of the following adjustments will improve the color display of this exam
D) increase the color threshold
65
Which of the following imaging techniques relies on Young’s modulus for the color displayed
C
66
____ increases the strength of all reflected signals regardless of reflector depth
D) overall gain
67
Which image demonstrates dirty posterior shadowing?
D