Therapeutic Modalities section 3 quiz
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When applying ultrasound with metered output of 4 W and an indicated beam nonuniformity ratio (BNR) 4, the highest intensity in the beam is: | 16 W
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Which of the following is not an indication for the use of ultrasound? | infection
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the spreading of an ultrasound beam is a result of ______ of the waves. | divergence
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a metered reading of 2 W per square cm passing though a sound head having an effective radiating area of 10 cm squared produces an output of ____ total watts | 20 W
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Reflection of ultrasonic energy occurs least between | water and soft tissue
(when compared to soft tissue and fat, soft tissue and vbone, soft tissue and air)
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All of the following are nonthermal(mechanical) effects of ultrasound except: | increased extensibitlity of collagen-rich structures
(increase blood flow, synthesis of protien, increased cell membrane permeability)
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when treating the patellar tendon with ultrasound what ouput frequency should be used? | 3 MHz
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When cells are exposed to high-pressure ridges, their size: | decreases
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Ultrasound that is pullsed so that is flows for .5 seconds and does not flow fo 1 second is operating at a percent duty cycle of: | 33%
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Determining the treatment duration is most closely dependent on what other output characteristic? | intensity
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to promote extensibility the tissues must be stretched within how many minutes after the conclusion of the treatment? | 3 minutes
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Standard therapeutic ultrasound generators can be employed to assist in the healing of fractures? | FALSE
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Which of the following substances transmits the highest percentage of ultrasonic energy relative to water? | Ultrasound transmission gel
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During shortwave diathermy application, high-frequency electromagnetic energy is changed to heat by the process of: | conversion
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Which of the following types of shortwave diathermy application places the athletes tissues within the generators physical circuit? | capacittive method
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When using short wave diathermy induction drum, the drum should be positioned ____ in from the patients skin. | 1 inch
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The energy from a shortwave diathermy unit may scatter as much as ____ feet from the source. | 3 feet
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Which form of shortwave diathermy should NOT be used over large areas of adipose tissue? | inductive method
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What four factors determine a medications ability to diffuse through the tissue | hydration, age, composition, vascularity, and thickness
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Type of energy in ultrasound/ shortwave diathermy | acoustical/electromagnetic
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Type of tissue heated in ultrasound/shortwave diathermy | collagen-rich/C:addipose, skin I: muscle, blood vessels
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Volume of tissue heated in us/swd | small(20cm^2)/large(200cm^2)
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Temp increase in us/swd | 1 MHz us-more than 6.3 degrees F 3 MHz us-more than 14.9 degress F, C swd-more than 7 degrees F, I more than 18 degrees F-intramuscular tissue
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Heat Retention for US/SWD | Us-short approximately 3 minutes SWD-long approximately 9 minutes
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