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Therapeutic Modalities section 3 quiz

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Question
Answer
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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