Electrophysical Agents - Shortwave Diathermy

45 Questions | Total Attempts: 662

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Treatment Quizzes & Trivia

Discuss physiological effects of shortwave diathermyUnderstand diff heating patternsDiscuss indications for use of SWDIdentify safety aspect and contra-indicationsClarify common clinical apps for SWD


Questions and Answers
  • 1. 
    Diathermy means h__
  • 2. 
    The frequency, wavelength and velocity of SWD is
    • A. 

      25.3 Mhz, 12m, 2x10 power of 7 m/s

    • B. 

      27.12 Mhz, 11m, 3x10 power of 8 m/s

  • 3. 
    Max efficiency in oscillation frequency btw patient circuit and machine circuit depends on
    • A. 

      Tissue type

    • B. 

      Bone density

    • C. 

      Position of body parts

    • D. 

      Position of diathermy electrodes

  • 4. 
    Two different types of SWD are c__ field and i__ field
  • 5. 
    The difference btw the 2 SWD fields are
    • A. 

      Types of energy emitted

    • B. 

      Type of rotation and position of the eqpt

    • C. 

      Type of electrode used during a diathermy application

  • 6. 
    The 2 types of biophysical principles for heating effects are e__ m__ field
  • 7. 
    The methods for heating effects using electric field are:. IO. DR. ECDThe amt of depolarization of polarizable molecules depends on DEC..
  • 8. 
    Di-electric means
    • A. 

      Ease with which the effect of a charge can be passed thru a material

    • B. 

      Ease of polarization

  • 9. 
    Di-electric constant means
    • A. 

      Ease with which the effect of a charge can be passed thru a material

    • B. 

      Ease of polarization

  • 10. 
    A low impedance is due to
    • A. 

      High dielectric constant, high conductivity

    • B. 

      Low dielectric constant, low conductivity

  • 11. 
    A low dielectric constant & conductivity is = to
    • A. 

      High water content, muscle nerve, blood vessels, internal organs & moist skin

    • B. 

      Low water content, bone, capsule, ligaments, fat, dry skin

    • C. 

      All of the above

  • 12. 
    A high dielectric constant & conductivity is = to
    • A. 

      High water content, muscle nerve, blood vessels, internal organs & moist skin

    • B. 

      Low water content, bone, capsule, ligaments, fat, dry skin

    • C. 

      All of the above

  • 13. 
    The electric field will
    • A. 

      Converge onto substance with high dielectric constant

    • B. 

      Converge onto substance with low dielectric constant

    • C. 

      Diverge within substances with high dielectric constant

    • D. 

      Diverge within substances with low dielectric constant

  • 14. 
    The closer/smaller the electrode, the more superficial & local the pattern of heating
    • A. 

      True

    • B. 

      False

  • 15. 
    Pattern of heating is changed by altering the relationship of the electrode to each other
    • A. 

      True

    • B. 

      False

  • 16. 
    The four types of electrode placement are:. T/CP. CP. L. CF
  • 17. 
    The characteristics of contra-planar (plates in series) are
    • A. 

      Current intensity is same in all parts of the series circuit

    • B. 

      Current has a choice of path it can follow

    • C. 

      The tissue with greatest molecular activity is elevated to the highest degree

    • D. 

      Fat has higher impedance than muscle or bone

  • 18. 
    The characteristics of co-planar (plates in parallel) are
    • A. 

      Current intensity is same in all parts of the series circuit

    • B. 

      Current has a choice of path it can follow

    • C. 

      Heat produced depends on density of current

    • D. 

      Always follow the path of least resistance

    • E. 

      As more current flows through tissues of low impedance, more heat is generated in these tissues

  • 19. 
    In induction field diathermy, the heating effects is done by
    • A. 

      Using magnetic field

    • B. 

      Induce an electrical current within body parts

    • C. 

      Using an electric field

    • D. 

      Made of metal that is shape into a coil

  • 20. 
    In induction field diathermy a low i__ conductor (body part) is placed with m__ field and a e__ current is induced called a e__ current
  • 21. 
    The strength of the m__ field is u__: greatest current density is in lowest or highest impedance tissues
  • 22. 
    Induction field diathermy is very effective for heating tissues with low conductivities & low electrolyte content, especially those well perfused with blood
    • A. 

      True

    • B. 

      False

  • 23. 
    There is high heat factor in fat, bone and collagen tissue as these have high conductivity as muscle
    • A. 

      True

    • B. 

      False

  • 24. 
    In principles of application for capacitor field the spacing of electrode
    • A. 

      Must have wide spacing for uniform field

    • B. 

      Strongest field closest to the conductor & weakens as it spreads out

    • C. 

      If spacing is too large, deep tissues receive less heat

    • D. 

      The depth for greatest absolute heating is 6 cm (2-9 cm)

    • E. 

      The depth for greatest absolute heating is 4 cm (2-7 cm)

  • 25. 
    In principles of application for capacitor field the size of electrode
    • A. 

      A little smaller than the part in order to achieve a uniform magnetic field

    • B. 

      A little larger than the part in order to achieve a uniform electric field

    • C. 

      If one is smaller than the other, the field tends to be concentrated on one side & dispersed on the other

    • D. 

      If one is larger than the other, the field tends to be concentrated on one side & dispersed on the other