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thermodsec3

Therapeutic Modalities section 3 quiz

QuestionAnswer
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
Created by: jwebst1
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