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Ultrasound Physics Exam 1

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Ultrasound Physics Exam 1
Ayla Pitts
Quiz by Ayla Pitts, updated more than 1 year ago
Ayla Pitts
Created by Ayla Pitts about 4 years ago
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Resource summary

Question 1

Question
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?
Answer
  • increases
  • decreases
  • no change

Question 2

Question
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?
Answer
  • increases
  • decreases
  • no change

Question 3

Question
The frequency of a transducer does not change. If the diameter of the new piezoelectric crystals increases, what happens to wavelength?
Answer
  • increases
  • decreases
  • no change

Question 4

Question
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?
Answer
  • increases
  • decreases
  • no change

Question 5

Question
At the location is the sound beam diameter three time greater than the transducer diameter?
Answer
  • 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

Question 6

Question
What is the shape of a sound beam created by a tiny piece of PZT?
Answer
  • hourglass shaped
  • V-shaped
  • round
  • shaped like a tube

Question 7

Question
Which of the following explains why a sound beam created by a disc-shaped crystal is hourglass-shaped?
Answer
  • Bernoulli's Principle
  • Sheffield's Law
  • Ohm's Law
  • Huygen's Principle

Question 8

Question
Which of the following locations is the deepest?
Answer
  • end of the fresnel zone
  • end of the focal zone
  • end of the fraunhofer zone
  • end of the near zone

Question 9

Question
Which of the following locations is the most shallow?
Answer
  • beginning of the far zone
  • beginning of the focal zone
  • focal depth
  • beginning of the Fraunhofer zone

Question 10

Question
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?
Answer
  • 6mm
  • 10mm

Question 11

Question
A pair of 9mm diameter probes are identical except for frequency, which is 3MHZ and 6MHz. WHich beam will have shallower focus?
Answer
  • 3MHz
  • 6MHz

Question 12

Question
Which of the following probes creates a beam with the deepest focus?
Answer
  • 4 mm diameter, 4 MHz
  • 6 mm diameter, 8 MHz
  • 4 mm diameter, 2 MHz
  • 5 mm diameter, 8MHz

Question 13

Question
Which of the following probes creates a beam with the shallowest focus?
Answer
  • 4 mm diameter, 4 MHz
  • 6 mm diameter, 8 MHz
  • 4 mm diameter, 2 MHz
  • 5 mm diameter, 8MHz

Question 14

Question
Which of the following probes creates a beam with a the shallowest focus?
Answer
  • small diameter, high frequency
  • large diameter, high frequency
  • small diameter, low frequency
  • large diameter, low frequency

Question 15

Question
Active elements diameter and near zone are directly related?
Answer
  • True
  • False

Question 16

Question
Transducer frequency and near zone length are inversely related.
Answer
  • True
  • False

Question 17

Question
Wavelength and near zone length are inversely related.
Answer
  • True
  • False

Question 18

Question
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?
Answer
  • 6 mm
  • 10 mm

Question 19

Question
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>
Answer
  • 3 MHz
  • 6 MHz

Question 20

Question
Which of the following probes creates a beam with least divergence?
Answer
  • 4 mm diameter, 4MHz
  • 6 mm diameter, 8MHz
  • 6 mm diameter, 2MHz
  • 5 mm diameter, 8 MHz

Question 21

Question
Which of the following probes creates a beam with most divergence?
Answer
  • 4 mm diameter, 4 MHz
  • 6 mm diameter, 8 MHz
  • 4 mm diameter, 2 MHz
  • 5 mm diameter, 8 MHz

Question 22

Question
Which of the following probes create a beam with the most divergence?
Answer
  • small diameter, high frequency
  • large diamter, high frequency
  • small diameter, low frequency
  • large diameter, low frequency

Question 23

Question
Transducer frequency and beam divergence are inversely related
Answer
  • True
  • False

Question 24

Question
Active element diameter and beam divergence are inversely related.
Answer
  • True
  • False

Question 25

Question
Mechanical scanning and linear phased arrays create sector-shaped images
Answer
  • True
  • False

Question 26

Question
Many active elements fire at almost the same time in mechanical scanner.
Answer
  • True
  • False

Question 27

Question
Many active elements fire at almost the same time in a phased array scanner.
Answer
  • True
  • False

Question 28

Question
Which of the following transducers is best described as mechanically steered and fixed, single focused?
Answer
  • annular phased array
  • annular array
  • mechincal
  • linear phased

Question 29

Question
Which of the following is best described as mechanically steered and multi-focus?
Answer
  • annular phased array
  • annular sequential array transducer
  • mechanical transducer
  • linear phased transducer

Question 30

Question
Which of the following transducers creates a rectangular shaped image?
Answer
  • annular phased array
  • linear sequential array
  • mechanical
  • linear phased

Question 31

Question
A linear phased array transducer has 128 crystals. How many of these crystals are fired to create a single sound beam?
Answer
  • 1
  • a small group
  • a large group
  • 128

Question 32

Question
A linear sequential array transducer has 128 crystals. How many of these crystals are fired to create a single sound beam?
Answer
  • 1
  • a small group
  • 128
  • a large group

Question 33

Question
In a linear phased array, what is the firing patten that steers a beam to the left or right?
Answer
  • electronic slope
  • electronic curvature

Question 34

Question
In linear phased arrays, what is the firing pattern that focuses a sound beam?
Answer
  • electronic slope
  • electonic curvature

Question 35

Question
There are large time delays in the firing pattern of a linear phased array transducer.
Answer
  • True
  • False

Question 36

Question
A machine that displays A-mode and Two- dimensional image is called a duplex scanner.
Answer
  • True
  • False

Question 37

Question
A machine that displays a Doppler and two-dimensional images is called a duplex scanner.
Answer
  • True
  • False

Question 38

Question
Which of the following improves elevational resoultion?
Answer
  • matrix array
  • linear phased array
  • one and one-half dimensional arry
  • two-dimensional array

Question 39

Question
Side lobes degrade axial resolution
Answer
  • True
  • False

Question 40

Question
Side lobes degrade lateral resolution
Answer
  • True
  • False

Question 41

Question
Which of the following forms of resolution improve when frame rate increases?
Answer
  • lateral
  • temporal
  • spatial
  • longitudinal

Question 42

Question
Which of the following is consistent with improved temporal resolution?
Answer
  • color doppler
  • more grey shades
  • more detail
  • high frame rate

Question 43

Question
All of the following decrease temporal resolution except?
Answer
  • lower frame rate
  • deeper imaging
  • multi-focus
  • narrow sector

Question 44

Question
A sonographer adjusts an ultrasound scan to double the depth of view from 5 cm to 10 cm. What happens to the frame rate?
Answer
  • it is halved
  • it doubles
  • it increases from 5 to 10 Hz
  • it is unchanged

Question 45

Question
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?
Answer
  • increased line density
  • wider sector
  • multi-focus imaging turned one
  • narrow sector

Question 46

Question
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?
Answer
  • it is doubled
  • it remains unchaged
  • it is halved
  • it is tripled

Question 47

Question
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?
Answer
  • temporal resolution was doubled
  • sector size was doubled
  • line density was doubled
  • imaging depth was halved

Question 48

Question
A sonographer using a phased array ultrasound system turns off the multi-focus feature. What is the most likely consequence of this action?
Answer
  • frame rate decreases
  • temporal resolution degrades
  • imaging depth increases
  • temporal resolution improves

Question 49

Question
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?
Answer
  • frame rate increases
  • temporal resolution decreases
  • imaging quality decreases
  • temporal resolution increases

Question 50

Question
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?
Answer
  • increases
  • decreases
  • remains unchanged

Question 51

Question
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?
Answer
  • increases
  • decreases
  • remains unchanged

Question 52

Question
Which of the following is most important in determinging the frame rate of a system?
Answer
  • speed of sound in the medium
  • dynamic range of the receiver
  • transducer frequency
  • transmitter output

Question 53

Question
Which of the following is most important in determining frame rate of a system?
Answer
  • depth of view
  • dynamic range of the receiver
  • transducer frequency
  • transmitter output

Question 54

Question
What is the frame rate if each image of the ultrasound system is created in 0.02 sec (1/50 sec)
Answer
  • 20 Hz
  • 100 Hz
  • 50 Hz
  • 16 Hz

Question 55

Question
What is the time needed to make a single image if the frame rate of an ultrasound system is 20 Hz?
Answer
  • 1 s
  • 0.02 s
  • 0.05 s
  • 15 Hz

Question 56

Question
The critical factor in determining frame rate, line density, and imaging depth is the tranducer style.
Answer
  • True
  • False

Question 57

Question
The number of lines per frame and the frame rate determine the frequency
Answer
  • True
  • False

Question 58

Question
The number of lines per frame and frame rate determine the PRF
Answer
  • True
  • False

Question 59

Question
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.
Answer
  • True
  • False

Question 60

Question
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.
Answer
  • True
  • False

Question 61

Question
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
Answer
  • True
  • False

Question 62

Question
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
Answer
  • True
  • False

Question 63

Question
When the frame is 30Hz, how long does it take to create a frame?
Answer
  • 30 sec
  • 3 sec
  • 0.3 sec
  • 1/30 sec
  • 1/3 sec

Question 64

Question
Under certain conditions, an ultrasound system creates imagine in 0.01 seconds. What is the frame rate?
Answer
  • 1 Hz
  • 10 sec
  • 100 Hz
  • 200 Hz
  • 0.02 Hz

Question 65

Question
What is the fundamental limitation of temporal resolution?
Answer
  • imaging depth
  • speed of sound in the medium
  • line density
  • sector size

Question 66

Question
All of the following are components of an ultrasound system except?
Answer
  • transducer
  • alternator
  • display
  • pulser
  • synchronizer
  • receiver

Question 67

Question
This type of pulser generates a constant electrical signal in the form of a sine wave
Answer
  • pulsed wave, array
  • continous wave
  • pulsed wave, single crystal

Question 68

Question
This type of pulser generates a single electrical spike, which ultimately creates a single sound pulse.
Answer
  • pulse wave, phased array
  • continuous wave
  • pulsed wave, single crystal

Question 69

Question
This type of pulser generates numerous electrical spikes, which ultimately create a single sound pulse
Answer
  • pulsed wave, phase array
  • continous
  • pulsed wave, single crystal

Question 70

Question
The acoustic power of the sound beam emitted from a transducer is determined by the ________ of the pules's signal
Answer
  • PRF
  • Frequnecy
  • voltage
  • rectification

Question 71

Question
All of the following functions of the receiver except
Answer
  • demodulation
  • supression
  • amplification
  • attenutation

Question 72

Question
Amplification processes all reflected signals in a similar manner
Answer
  • True
  • False

Question 73

Question
Compensation processes all reflected signals in a similar manner
Answer
  • True
  • False
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