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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:
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Which of the following is not an indication for the use of ultrasound?
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thermodsec3
Therapeutic Modalities section 3 quiz
| 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 |
| Which of the following is not an indication for the use of ultrasound? | infection |
| the spreading of an ultrasound beam is a result of ______ of the waves. | divergence |
| 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 |
| 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) |
| 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) |
| when treating the patellar tendon with ultrasound what ouput frequency should be used? | 3 MHz |
| When cells are exposed to high-pressure ridges, their size: | decreases |
| 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% |
| Determining the treatment duration is most closely dependent on what other output characteristic? | intensity |
| to promote extensibility the tissues must be stretched within how many minutes after the conclusion of the treatment? | 3 minutes |
| Standard therapeutic ultrasound generators can be employed to assist in the healing of fractures? | FALSE |
| Which of the following substances transmits the highest percentage of ultrasonic energy relative to water? | Ultrasound transmission gel |
| During shortwave diathermy application, high-frequency electromagnetic energy is changed to heat by the process of: | conversion |
| Which of the following types of shortwave diathermy application places the athletes tissues within the generators physical circuit? | capacittive method |
| When using short wave diathermy induction drum, the drum should be positioned ____ in from the patients skin. | 1 inch |
| The energy from a shortwave diathermy unit may scatter as much as ____ feet from the source. | 3 feet |
| Which form of shortwave diathermy should NOT be used over large areas of adipose tissue? | inductive method |
| What four factors determine a medications ability to diffuse through the tissue | hydration, age, composition, vascularity, and thickness |
| Type of energy in ultrasound/ shortwave diathermy | acoustical/electromagnetic |
| Type of tissue heated in ultrasound/shortwave diathermy | collagen-rich/C:addipose, skin I: muscle, blood vessels |
| Volume of tissue heated in us/swd | small(20cm^2)/large(200cm^2) |
| 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 |
| Heat Retention for US/SWD | Us-short approximately 3 minutes SWD-long approximately 9 minutes |
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