Chapter 12 2d Imaging

60 Questions

Settings
Please wait...
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

  • 26. 
    When the spike line is straight, an unfocused sound beam is created in a linear phased array
    • A. 

      True

    • B. 

      False

  • 27. 
    In linear phased array the curved pattern creates a foucused sound beam.
    • A. 

      True

    • B. 

      False

  • 28. 
    The sound beam is focused if the spike line in linear phased array is curved
    • A. 

      True

    • B. 

      False

  • 29. 
    The active elements of annular array transducers appear as             shaped.
    • A. 

      Rectangular

    • B. 

      Square

    • C. 

      Disc

    • D. 

      Trapizoid

  • 30. 
    The annular phased array contains how many crystals?
    • A. 

      More than one

    • B. 

      Less than one

    • C. 

      One

    • D. 

      None of the above

  • 31. 
    Annular phased array transducers use               steering
    • A. 

      Mechanical

    • B. 

      Electronic

  • 32. 
    The annular phased array transducer collects informatiom only from the shallowest depths;all other information is ignored.
    • A. 

      True

    • B. 

      False

  • 33. 
    The annular phased arrays image is              
  • 34. 
    When one ring of an annular phased array is damaged what can be said?
    • A. 

      Only a portion of the image is lost

    • B. 

      Whole image is lost

    • C. 

      Its irratic

  • 35. 
    How many crystals does the linear seq. array carry?
    • A. 

      120-250

    • B. 

      100-300

    • C. 

      125-300

  • 36. 
    All is true about the linear seq. array but one:
    • A. 

      Rectangular-shaped

    • B. 

      Elements are arranged side by side

    • C. 

      Each crystal is about 2 wavelength in width

    • D. 

      Is up to 10cm long

  • 37. 
    With linear seq. arrays,some but not all of the crystals are fired simultaneously to create each sound beam 
    • A. 

      True

    • B. 

      False

  • 38. 
    The linear sequential transducer has what kinda of shape image?
    • A. 

      Disc shaped

    • B. 

      Circular shaped

    • C. 

      Rectangular

  • 39. 
    Although a linear sequential array with a 10cm footprint may produce an 8 cm wide image, it cannot produce an image that is wider than 10cm
    • A. 

      True

    • B. 

      False

  • 40. 
    When one element in a linear sequential array is damaged,only the portionof the image extending directly below the damaged element is affected.
    • A. 

      True

    • B. 

      False

  • 41. 
    Can linear sequential array transducers steer sound beams electronically?
    • A. 

      Yes

    • B. 

      No

  • 42. 
    Curvilinear array transducers is also known as :
    • A. 

      Convex

    • B. 

      Curved

    • C. 

      Vector

    • D. 

      Linear

  • 43. 
    A convex array has up to how many crystals?
    • A. 

      120-250

    • B. 

      120-140

    • C. 

      140-200

    • D. 

      100-300

  • 44. 
    In a convex array each crystal is about what width?
    • A. 

      1 wavelength

    • B. 

      2 wavelength

  • 45. 
    In convex sequential array, some but not all crysatls are fired.
    • A. 

      True

    • B. 

      False

  • 46. 
    In convex array transducers focusing is achieved :
    • A. 

      Mechanically

    • B. 

      Electronically

  • 47. 
    The image shape of the convex array transucer is:
    • A. 

      Blunted sector shaped

    • B. 

      Sector shaped

    • C. 

      Disc shaped

  • 48. 
    The curvilinear array is damaged, only the portion of the image is affected
    • A. 

      True

    • B. 

      False

  • 49. 
    A vector array is a combination of what?
    • A. 

      Linear sequential and linear phased array

    • B. 

      Linear phased array and convex array

  • 50. 
    The vector array has how many crystals?
    • A. 

      120-250

    • B. 

      100-300

    • C. 

      150-300

  • 51. 
    The vector array has a trapzoidal image
    • A. 

      True

    • B. 

      False

  • 52. 
    What shape of the active element creates the best elevational resolution?
  • 53. 
    Which transducer types have the best elevational resoltuion?
  • 54. 
    A technique called                 can be used to make a sound beam narrow over a greater range of depths and optimize lateral resolution
  • 55. 
    Reducing the strength of the side and grating lobes can be achieved by a process called                   
  • 56. 
    Mechanical scanning produces pictures that are similar in shape to linear phased array images
    • A. 

      True

    • B. 

      False

  • 57. 
    Many active elements fire at almost the same time in a mechanical scanner.
    • A. 

      True

    • B. 

      False

  • 58. 
    Many active elements are fired at almost the same time in a phased array scanner.
    • A. 

      True

    • B. 

      False

  • 59. 
    A linear sequential array transducer has 128 crystals.how many of these crystals are fired to create a single sound beam
    • A. 

      1

    • B. 

      A small group

    • C. 

      A large group

    • D. 

      128

  • 60. 
    How are the piezoelectric crystals excited when using an ultrasound system with a sequential linear array transducer?
    • A. 

      Singly and in order

    • B. 

      In pairs

    • C. 

      In a specific order

    • D. 

      In a random sequence