21231862
Descripción
Test por Ayla Pitts, actualizado hace más de 1 año
|
Creado por Ayla Pitts
hace más de 4 años
|
|
Pregunta 1
Pregunta
The frequency of a transducer does not change. If the diameter of the new piezoelectric crystal increase, what happens happens to the near zone length?
Respuesta
-
increases
-
decreases
-
no change
Pregunta 2
Pregunta
The frequency of a transducer does not change. If the diameter of the new piezoelectric crystal increases, what happens to the beam diameter in the far zone?
Respuesta
-
increases
-
decreases
-
no change
Pregunta 3
Pregunta
The frequency of a transducer does not change. If the diameter of the new piezoelectric crystals increases, what happens to wavelength?
Respuesta
-
increases
-
decreases
-
no change
Pregunta 4
Pregunta
The frequency of a transducer does not change. If the diameter of the new piezoelectric crystal increase, what happens to the beam diameter in the near zone?
Respuesta
-
increases
-
decreases
-
no change
Pregunta 5
Pregunta
At the location is the sound beam diameter three time greater than the transducer diameter?
Respuesta
-
at the end of the near zone
-
at the depth equal to four focal lengths
-
at the end of the far zone
-
at the triple-diameter depth
Pregunta 6
Pregunta
What is the shape of a sound beam created by a tiny piece of PZT?
Respuesta
-
hourglass shaped
-
V-shaped
-
round
-
shaped like a tube
Pregunta 7
Pregunta
Which of the following explains why a sound beam created by a disc-shaped crystal is hourglass-shaped?
Respuesta
-
Bernoulli's Principle
-
Sheffield's Law
-
Ohm's Law
-
Huygen's Principle
Pregunta 8
Pregunta
Which of the following locations is the deepest?
Respuesta
-
end of the fresnel zone
-
end of the focal zone
-
end of the fraunhofer zone
-
end of the near zone
Pregunta 9
Pregunta
Which of the following locations is the most shallow?
Respuesta
-
beginning of the far zone
-
beginning of the focal zone
-
focal depth
-
beginning of the Fraunhofer zone
Pregunta 10
Pregunta
A pair of 6MHz probes are identical excepts for the active element diameter. The active element diameters are 6mm and 10mm. The sound beam of which probe will have a shallower focus?
Respuesta
-
6mm
-
10mm
Pregunta 11
Pregunta
A pair of 9mm diameter probes are identical except for frequency, which is 3MHZ and 6MHz. WHich beam will have shallower focus?
Respuesta
-
3MHz
-
6MHz
Pregunta 12
Pregunta
Which of the following probes creates a beam with the deepest focus?
Respuesta
-
4 mm diameter, 4 MHz
-
6 mm diameter, 8 MHz
-
4 mm diameter, 2 MHz
-
5 mm diameter, 8MHz
Pregunta 13
Pregunta
Which of the following probes creates a beam with the shallowest focus?
Respuesta
-
4 mm diameter, 4 MHz
-
6 mm diameter, 8 MHz
-
4 mm diameter, 2 MHz
-
5 mm diameter, 8MHz
Pregunta 14
Pregunta
Which of the following probes creates a beam with a the shallowest focus?
Respuesta
-
small diameter, high frequency
-
large diameter, high frequency
-
small diameter, low frequency
-
large diameter, low frequency
Pregunta 15
Pregunta
Active elements diameter and near zone are directly related?
Respuesta
- True
- False
Pregunta 16
Pregunta
Transducer frequency and near zone length are inversely related.
Respuesta
- True
- False
Pregunta 17
Pregunta
Wavelength and near zone length are inversely related.
Respuesta
- True
- False
Pregunta 18
Pregunta
A pair of 6 MHz probes are identical excepts for the active element diameter, which is 6 mm and 10 mm. Which beam will be more compact in the far field?
Respuesta
-
6 mm
-
10 mm
Pregunta 19
Pregunta
A pair of 9 mm diameter probes are identical except for frequncies, which are 3 MHz and 6MHz. Which sound beam will spread out more in the far field>
Respuesta
-
3 MHz
-
6 MHz
Pregunta 20
Pregunta
Which of the following probes creates a beam with least divergence?
Respuesta
-
4 mm diameter, 4MHz
-
6 mm diameter, 8MHz
-
6 mm diameter, 2MHz
-
5 mm diameter, 8 MHz
Pregunta 21
Pregunta
Which of the following probes creates a beam with most divergence?
Respuesta
-
4 mm diameter, 4 MHz
-
6 mm diameter, 8 MHz
-
4 mm diameter, 2 MHz
-
5 mm diameter, 8 MHz
Pregunta 22
Pregunta
Which of the following probes create a beam with the most divergence?
Respuesta
-
small diameter, high frequency
-
large diamter, high frequency
-
small diameter, low frequency
-
large diameter, low frequency
Pregunta 23
Pregunta
Transducer frequency and beam divergence are inversely related
Respuesta
- True
- False
Pregunta 24
Pregunta
Active element diameter and beam divergence are inversely related.
Respuesta
- True
- False
Pregunta 25
Pregunta
Mechanical scanning and linear phased arrays create sector-shaped images
Respuesta
- True
- False
Pregunta 26
Pregunta
Many active elements fire at almost the same time in mechanical scanner.
Respuesta
- True
- False
Pregunta 27
Pregunta
Many active elements fire at almost the same time in a phased array scanner.
Respuesta
- True
- False
Pregunta 28
Pregunta
Which of the following transducers is best described as mechanically steered and fixed, single focused?
Respuesta
-
annular phased array
-
annular array
-
mechincal
-
linear phased
Pregunta 29
Pregunta
Which of the following is best described as mechanically steered and multi-focus?
Respuesta
-
annular phased array
-
annular sequential array transducer
-
mechanical transducer
-
linear phased transducer
Pregunta 30
Pregunta
Which of the following transducers creates a rectangular shaped image?
Respuesta
-
annular phased array
-
linear sequential array
-
mechanical
-
linear phased
Pregunta 31
Pregunta
A linear phased array transducer has 128 crystals. How many of these crystals are fired to create a single sound beam?
Respuesta
-
1
-
a small group
-
a large group
-
128
Pregunta 32
Pregunta
A linear sequential array transducer has 128 crystals. How many of these crystals are fired to create a single sound beam?
Respuesta
-
1
-
a small group
-
128
-
a large group
Pregunta 33
Pregunta
In a linear phased array, what is the firing patten that steers a beam to the left or right?
Respuesta
-
electronic slope
-
electronic curvature
Pregunta 34
Pregunta
In linear phased arrays, what is the firing pattern that focuses a sound beam?
Respuesta
-
electronic slope
-
electonic curvature
Pregunta 35
Pregunta
There are large time delays in the firing pattern of a linear phased array transducer.
Respuesta
- True
- False
Pregunta 36
Pregunta
A machine that displays A-mode and Two- dimensional image is called a duplex scanner.
Respuesta
- True
- False
Pregunta 37
Pregunta
A machine that displays a Doppler and two-dimensional images is called a duplex scanner.
Respuesta
- True
- False
Pregunta 38
Pregunta
Which of the following improves elevational resoultion?
Respuesta
-
matrix array
-
linear phased array
-
one and one-half dimensional arry
-
two-dimensional array
Pregunta 39
Pregunta
Side lobes degrade axial resolution
Respuesta
- True
- False
Pregunta 40
Pregunta
Side lobes degrade lateral resolution
Respuesta
- True
- False
Pregunta 41
Pregunta
Which of the following forms of resolution improve when frame rate increases?
Respuesta
-
lateral
-
temporal
-
spatial
-
longitudinal
Pregunta 42
Pregunta
Which of the following is consistent with improved temporal resolution?
Respuesta
-
color doppler
-
more grey shades
-
more detail
-
high frame rate
Pregunta 43
Pregunta
All of the following decrease temporal resolution except?
Respuesta
-
lower frame rate
-
deeper imaging
-
multi-focus
-
narrow sector
Pregunta 44
Pregunta
A sonographer adjusts an ultrasound scan to double the depth of view from 5 cm to 10 cm. What happens to the frame rate?
Respuesta
-
it is halved
-
it doubles
-
it increases from 5 to 10 Hz
-
it is unchanged
Pregunta 45
Pregunta
A sonographer adjusts an ultrasound scan to double the depth of view fro 5 cm to 10 cm. If the frame rate remains the same which on of the following also occurs?
Respuesta
-
increased line density
-
wider sector
-
multi-focus imaging turned one
-
narrow sector
Pregunta 46
Pregunta
A sonographer adjusts an ultrasound machine to change the sector siz for 90 to 45 degrees. Nothing else changes. What happends to the frame rate?
Respuesta
-
it is doubled
-
it remains unchaged
-
it is halved
-
it is tripled
Pregunta 47
Pregunta
A sonographer adjusts an ultrasound system to change the sector size for 90 to 45 degree. The frame rate was unchanged. What else must have happened?
Respuesta
-
temporal resolution was doubled
-
sector size was doubled
-
line density was doubled
-
imaging depth was halved
Pregunta 48
Pregunta
A sonographer using a phased array ultrasound system turns off the multi-focus feature. What is the most likely consequence of this action?
Respuesta
-
frame rate decreases
-
temporal resolution degrades
-
imaging depth increases
-
temporal resolution improves
Pregunta 49
Pregunta
A sonographer increases the line density from 1 line per degree of the sector to 3 lines per degree of the sector. What is the most likely consequence of this action?
Respuesta
-
frame rate increases
-
temporal resolution decreases
-
imaging quality decreases
-
temporal resolution increases
Pregunta 50
Pregunta
A sonographer reduces the sector angle for 90 degrees to 30 degrees. At the same time, the ultrasound system automatically increases the lines density from 1 line per degree to 2 lines per degree. No other change is made. What will happen to the frame rate?
Respuesta
-
increases
-
decreases
-
remains unchanged
Pregunta 51
Pregunta
A sonographer reduces the sector angle for 90 degrees to 30 degrees. At the same time, the ultrasound system automatically increases the lines density from 1 line per degree to 3 lines per degree. No other change are made. What will happen to temporal resolution?
Respuesta
-
increases
-
decreases
-
remains unchanged
Pregunta 52
Pregunta
Which of the following is most important in determinging the frame rate of a system?
Respuesta
-
speed of sound in the medium
-
dynamic range of the receiver
-
transducer frequency
-
transmitter output
Pregunta 53
Pregunta
Which of the following is most important in determining frame rate of a system?
Respuesta
-
depth of view
-
dynamic range of the receiver
-
transducer frequency
-
transmitter output
Pregunta 54
Pregunta
What is the frame rate if each image of the ultrasound system is created in 0.02 sec (1/50 sec)
Respuesta
-
20 Hz
-
100 Hz
-
50 Hz
-
16 Hz
Pregunta 55
Pregunta
What is the time needed to make a single image if the frame rate of an ultrasound system is 20 Hz?
Respuesta
-
1 s
-
0.02 s
-
0.05 s
-
15 Hz
Pregunta 56
Pregunta
The critical factor in determining frame rate, line density, and imaging depth is the tranducer style.
Respuesta
- True
- False
Pregunta 57
Pregunta
The number of lines per frame and the frame rate determine the frequency
Respuesta
- True
- False
Pregunta 58
Pregunta
The number of lines per frame and frame rate determine the PRF
Respuesta
- True
- False
Pregunta 59
Pregunta
If the imaging depth of a scan is 15 cm and there are 100 lines in the image, then the number of pulses making up the scan is 1500.
Respuesta
- True
- False
Pregunta 60
Pregunta
If the imaging depth of a scan is 15 cm and there are 100 lines in the image, then the number of pulses making up the scan is 100.
Respuesta
- True
- False
Pregunta 61
Pregunta
If 100 scan lines make up an image and the frame rate is 30 per second, then the transducer's frequency is 3,000 HZ
Respuesta
- True
- False
Pregunta 62
Pregunta
If 100 scan lines make up an image and the frame rate is 30 per second, then the system's PRF is 3,000 Hz
Respuesta
- True
- False
Pregunta 63
Pregunta
When the frame is 30Hz, how long does it take to create a frame?
Respuesta
-
30 sec
-
3 sec
-
0.3 sec
-
1/30 sec
-
1/3 sec
Pregunta 64
Pregunta
Under certain conditions, an ultrasound system creates imagine in 0.01 seconds. What is the frame rate?
Respuesta
-
1 Hz
-
10 sec
-
100 Hz
-
200 Hz
-
0.02 Hz
Pregunta 65
Pregunta
What is the fundamental limitation of temporal resolution?
Respuesta
-
imaging depth
-
speed of sound in the medium
-
line density
-
sector size
Pregunta 66
Pregunta
All of the following are components of an ultrasound system except?
Respuesta
-
transducer
-
alternator
-
display
-
pulser
-
synchronizer
-
receiver
Pregunta 67
Pregunta
This type of pulser generates a constant electrical signal in the form of a sine wave
Respuesta
-
pulsed wave, array
-
continous wave
-
pulsed wave, single crystal
Pregunta 68
Pregunta
This type of pulser generates a single electrical spike, which ultimately creates a single sound pulse.
Respuesta
-
pulse wave, phased array
-
continuous wave
-
pulsed wave, single crystal
Pregunta 69
Pregunta
This type of pulser generates numerous electrical spikes, which ultimately create a single sound pulse
Respuesta
-
pulsed wave, phase array
-
continous
-
pulsed wave, single crystal
Pregunta 70
Pregunta
The acoustic power of the sound beam emitted from a transducer is determined by the ________ of the pules's signal
Respuesta
-
PRF
-
Frequnecy
-
voltage
-
rectification
Pregunta 71
Pregunta
All of the following functions of the receiver except
Respuesta
-
demodulation
-
supression
-
amplification
-
attenutation
Pregunta 72
Pregunta
Amplification processes all reflected signals in a similar manner
Respuesta
- True
- False
Pregunta 73
Pregunta
Compensation processes all reflected signals in a similar manner
Respuesta
- True
- False
¿Quieres crear tus propios Tests gratis con GoConqr? Más información.