Physics-Real-Time Imaging

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Author:
aprilh4485
ID:
116594
Filename:
Physics-Real-Time Imaging
Updated:
2011-11-14 21:37:30
Tags:
Sonography
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Description:
Real-Time Imaging
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  1. Which of the following forms of resolution improves when frame rate increases?
    A. lateral
    B. temporal
    C. spatial
    D. longitudinal
    B. temporal
    (this multiple choice question has been scrambled)
  2. Which of the following is consistent with improved temporal resolution?
    A. color Doppler
    B. more gray shades
    C. more detail
    D. higher frame rate
    D. higher frame rate
    (this multiple choice question has been scrambled)
  3. All of the following decrease temporal resolution except:
    A. lower frame rate
    B. deeper imaging
    C. multi-focus
    D. narrower sector
    D. narrower sector
  4. A sonographer adjusts an ultrasound scan to double the depth of view from 5 cm to 10 cm. What happens to the frame rate?
    • it will be halved
    • frame rate and depth are inversely related
  5. A sonographer adjusts an ultrasound scan to double the depth of view from 5 cm to 10 cm. If the frame rate remains the same, which of the following also occurs?
    A. narrower sector
    B. multi-focus imaging turned on
    C. increased line density
    D. wider sector
    A. narrower sector
    (this multiple choice question has been scrambled)
  6. A sonographer adjusts an ultrasound machine to change the sector size from 90 to 45 degrees. Nothing else changes. What happens to the frame rate?
    it is doubled because fewer pulses are needed to make the image
  7. A sonographer adjusts an ultrasound system to change the sector size from 90 to 45 degrees. The frame rate was unchanged. What else must have happened?
    A. temporal resolution was doubled
    B. sector size was doubled
    C. line density was doubled
    D. imaging depth was halfed
    C. line density was doubled
    (this multiple choice question has been scrambled)
  8. A sonographer, using a phased array ultrasound system, turns off the multi-focus feature. what is the most likely consequence of this action?
    A. imaging depth increases
    B. frame rate decreases
    C. temporal resolution degrades
    D. temporal resolution improves
    D. temporal resolution improves
    (this multiple choice question has been scrambled)
  9. A sonographer increases the line density from 1 line per degree of sector to 3 lines per degree of sector. What is the most likely consequence of this action?
    A. temporal resolution decreases
    B. temporal resolution increases
    C. frame rate increases
    D. imaging quality decreases
    A. temporal resolution decreases
    (this multiple choice question has been scrambled)
  10. A sonographer reduces the sector angle from 90 to 30 degrees. At the same time, the ultrasound system automatically increases the line density from 1 line per degree to 2 lines per degree. No other changes are made. What will happen to the frame rate?
    increases frame rate
  11. A sonographer reduces the sector angle from 90 to 30 degrees. At the same time, the ultrasound system automatically increases the line density from 1 line per degree to 3 lines per degree. No other changes are made. What will happen to the temporal resolution?
    temporal resolution is unchanged
  12. Which of the following is most important in determining the frame rate of a system?
    A. transducer frequency
    B. speed of sound in the medium
    C. dynamic range of the receiver
    D. transmitter output
    B. speed of sound in the medium
    (this multiple choice question has been scrambled)
  13. Which of the following is most important in determining the frame rate of a system?
    A. transmitter output
    B. transducer frequency
    C. depth of view
    D. dynamic range of the receiver
    C. depth of view
    (this multiple choice question has been scrambled)
  14. What is the frame rate of each image of the ultrasound system is created in 0.02 sec (1/50 sec)?
    50 Hz
  15. What is the time needed to make a single image if the frame rate of ultrasound system is 20 Hz?
    1/20 sec or 0.05 sec
  16. True or False.
    The critical factor in determining frame rate, line density, and imaging depth is transducer style
    • False.
    • the critical factor in determining frame rate, line density, and imaging depth is time.
  17. True or False.
    The number of lines per frame and the frame rate determine the frequency.
    • False.
    • determine the PRF
  18. True or False.
    The number of lines per frame and the frame rate determine the pulse repetition frequency.
    True
  19. True or False.
    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.
    • False
    • 100 pulses
  20. True or False.
    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.
    True
  21. True or False.
    If 100 scan lines make up an image and the frame rate is 30 per second, then then transducer's frequency is 3000 Hz.
    • False.
    • they are unrelated
  22. True or False.
    If 100 scan lines make up an image and the frame rate is 30 per second, then the system's pulse repetition frequency is 3000 Hz.
    True
  23. When the frame rate is 30 Hz, how long does it take to create a frame?
    1/30 sec
  24. Under certain conditions, an ultrasound system creates each image in 0.01 seconds. What is the frame rate?
    100 Hz

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