525 Week 2 Quiz

24 Questions

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Medical Quizzes & Trivia

Questions and Answers
  • 1. 
    The main purpose of ultrasound is to:
    • A. 

      Increase the extensibility of tendons, ligaments, and joint capsules

    • B. 

      Raise the temperature of deep structures such as tendons, ligaments, and joint capsules

    • C. 

      Raise the temperature of adipose tissue found in the subcutaneous layer

    • D. 

      Raise the temperature of the bony structures that are the origin points of muscles

  • 2. 
    Ultrasound may penetrate up to how many centimeters?
    • A. 

      8

    • B. 

      3

    • C. 

      5

    • D. 

      1

  • 3. 
    Frequency band for medical ultrasound is:
    • A. 

      .3 to 8 mHz

    • B. 

      .1 to 3 mHz

    • C. 

      .3 to 5 mHz

    • D. 

      .8 to 3 mHz

  • 4. 
    • A. 

      Used for diagnosis -- imagining of internal structures (pregnancy)

    • B. 

      Used to carbon date fossils

    • C. 

      Used in tissue destruction & surgery

    • D. 

      Used for gene splicing

    • E. 

      Used for tumor irradiation (hypothermia)

    • F. 

      Used to map the human genome

    • G. 

      Used in PM&R to facilitate restoration and healing of soft tissue

  • 5. 
    • A. 

      Occurs when crystal is heated, producing a sound wave after receiving an electrical current

    • B. 

      Occurs when crystal vibrates and resonates, producing a sound wave after receiving an electrical current

    • C. 

      Occurs when crystal is cooled, producing a sound wave after receiving an electrical current

    • D. 

      Occurs when crystal vibrates and resonates, producing a sound wave after receiving a heat current

  • 6. 
    The methods of delivery of ultrasound are:1) Direct contact2) Water immersion
    • A. 

      True

    • B. 

      False

  • 7. 
    The main propagation of ultrasound in soft tissue is:
    • A. 

      Stable cavitation

    • B. 

      Unstable cavitation

    • C. 

      Shear or transverse wave

    • D. 

      Longitudinal or compressional wave

  • 8. 
    Acoustic impedance is the term that denotes:
    • A. 

      Relative resistance of a medium to wave energy - more dense or heavy molecules are less compliant for being squeezed

    • B. 

      Crystal vibration that produces a sound wave after receiving an electrical current

    • C. 

      Sound propagation

    • D. 

      Compression waves

  • 9. 
    Sound propagation occurs when waves are generated in rapid succession.
    • A. 

      True

    • B. 

      False

  • 10. 
    Microstreaming or acoustic streaming is:
    • A. 

      Application of alternating curent

    • B. 

      Sound movement in a fluid field

    • C. 

      Stable cavitation

    • D. 

      Fluid movement in a sound field

  • 11. 
    Shear waves occur in solid media.
    • A. 

      True

    • B. 

      False

  • 12. 
    Longtitudinal waves occur in solid media.
    • A. 

      True

    • B. 

      False

  • 13. 
    Longtitudinal waves occur in liquid and gases.
    • A. 

      True

    • B. 

      False

  • 14. 
    Longtitudinal waves occur in liquid and gases.
    • A. 

      True

    • B. 

      False

  • 15. 
    Bone has a HIGH acoustic impedance.
    • A. 

      True

    • B. 

      False

  • 16. 
    Bone has a LOW acoustic impedance.
    • A. 

      True

    • B. 

      False

  • 17. 
    Therapeutic ultrasound is a thermal modality which can be used to heat structures:
    • A. 

      Superficially only

    • B. 

      Superficially (0-1cm) or at greater depths (up to 5cm)

    • C. 

      Only at depths greater than 1 cm

    • D. 

      Only when under the direction of an x-ray technician

  • 18. 
    The MOST COMMON frequency in use for therapeutic ultrasound is (per the Chapter 6 additional reading handout):
    • A. 

      .8 MHz

    • B. 

      1 MHz

    • C. 

      2 MHz

    • D. 

      3 MHz

  • 19. 
    A frequency of 1 MHz will provide deeper penetration than which other frequency from choices provided:
    • A. 

      .8 MHz

    • B. 

      3 MHz

  • 20. 
    The larger the sound head or transducer (and therefore the crystal), the greater the divergence of the field.
    • A. 

      True

    • B. 

      False

  • 21. 
    Intensity is determined by:
    • A. 

      Acoustic power (watts) MULTIPLIED by the effective radiating area (sq. cm) of the transducer (head)

    • B. 

      Acoustic power (watts) DIVIDED by the effective radiating area (sq. cm) of the transducer (head)

  • 22. 
    Acoustic power means what with regards to therapeutic ultrasound?
    • A. 

      Ohms

    • B. 

      Watts

    • C. 

      Electrical pulses

    • D. 

      BTU's

  • 23. 
    The term that describes the following is called waht:Movement of molecules occurs in the SAME direction as the flow of energy – the molecules that are pushed forward cause a compression of molecules, creating a wave – the wave continues to expand until the energy is spent
  • 24. 
    Choose the 3 parameters the OT must set on ultrasound unit before beginning therapy:
    • A. 

      Duty-cycle

    • B. 

      Pulse parameter

    • C. 

      Intensity

    • D. 

      Acoustic impedance

    • E. 

      Frequency