Chapter 12 2D Imaging

60 Questions | Total Attempts: 30

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Image Quizzes & Trivia

Questions and Answers
  • 1. 
    What characteristics of sound make it difficult to create two dimensional images?
    • A. 

      Sound travels only in a straight line

    • B. 

      Sound beams must be narrow to opitmize lateral resolution

    • C. 

      Multiple pulses

    • D. 

      Less pulses

  • 2. 
    What overcomes the difficulties of two dimensional images?
    • A. 

      A straight line

    • B. 

      Few pulses

    • C. 

      One pulse at a time

    • D. 

      Multiple pulses

  • 3. 
    The mechanical transducer has what kind of shape?
    • A. 

      Disc shaped

    • B. 

      Rectangular shaped

  • 4. 
    How many crystals does the mechanical transducer hold?
    • A. 

      1

    • B. 

      2

    • C. 

      3

    • D. 

      10

  • 5. 
    The image created by by a mechanical transducer is fan or sector shaped
    • A. 

      True

    • B. 

      False

  • 6. 
    The 2 dimensionalimage is built up by rotating the crystal with a             .
  • 7. 
    In mechanical beam steering the scan plane is created through?
    • A. 

      Electronic steering

    • B. 

      Mechanical steering

  • 8. 
    Mechanical transducers have a fixed focal depth
    • A. 

      True

    • B. 

      False

  • 9. 
    Mechanical transducers use  2 methods of fixed focusing which are:
    • A. 

      Internal focusing

    • B. 

      External focusing

    • C. 

      Both internal and external focusing

    • D. 

      None

  • 10. 
    With a mechanical transducer, the pzt crystal is physically moved to create the image. 
    • A. 

      True

    • B. 

      False

  • 11. 
    With the mechanical transuder, if the PZT crystal is damaged. What happens to the image?
    • A. 

      Entire image is lost

    • B. 

      Portion of the image is lost

    • C. 

      Nothing happens

    • D. 

      Turns black and grey

  • 12. 
    Arrays contain only one element
    • A. 

      True

    • B. 

      False

  • 13. 
    An array comprises a single slab of PZT cut into a collectoinof seperate pieces called:
    • A. 

      Elements

    • B. 

      Slopes

    • C. 

      Waves

    • D. 

      Pulses

  • 14. 
    A channel is a combnation of?
    • A. 

      Active element, wire, and system electronics

    • B. 

      Crystal,backing material, gel

    • C. 

      System electronics,pzt,skin

  • 15. 
    There are several types of array transuders which are:
    • A. 

      Linear

    • B. 

      Vector

    • C. 

      Annular

    • D. 

      Convex

  • 16. 
    The face of a linear phased array is about what size?
    • A. 

      1cm on each side

    • B. 

      2cm on each side

    • C. 

      1.5cm on each side

    • D. 

      .1cm on each side

  • 17. 
    The beam is steered and focused using an electrical technique called phasing
    • A. 

      True

    • B. 

      False

  • 18. 
    How many crystals does the linear phased array contain?
    • A. 

      100-300

    • B. 

      100-200

    • C. 

      100

    • D. 

      100-400

  • 19. 
    Each element on the the linear phased array is rectangular and narrow
    • A. 

      True

    • B. 

      False

  • 20. 
    The linear phased array has elements with a width of?
    • A. 

      1/4 to 1/2 of the sounds wavelength

    • B. 

      1/3/ to 1/2 of the sounds wavelength

    • C. 

      1/5 to1/3 of the sounds wavelength

  • 21. 
    The image created by a phased array transducer is:
    • A. 

      Fan or sector shaped

    • B. 

      Rectangular

    • C. 

      Circular

  • 22. 
    With linear phased array transudcers, sound beams are focused mechanically
    • A. 

      True

    • B. 

      False

  • 23. 
    Phased array always means "adjustable" or "multi focus"
    • A. 

      True

    • B. 

      False

  • 24. 
    Damaged PZT crystals in linear phased array result in :
    • A. 

      Inconsistant or erratic beam steering

    • B. 

      No image

  • 25. 
    All active elements in a linear phased array probe are fired to create each sound beam.
    • A. 

      True

    • B. 

      False