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US Modalities

QuestionAnswer
What is US frequency defined as? greater than 20,000 cycles per second
Therapeutic US typically has a frequency between what? .7 and 3.3 MHz
What is another name for transducer Soundhead
the amount of acoustic energy per unit of time is expressed in what? watts
Intensity is measured by? W/cm2
continuous 100%
1:1 50%
1:2 33%
1:3 25%
1:4 20%
1:4 duty cycle is generally 2m on 8m off
frequency is expressed how? cycles per second
T or F: 1MHz penetrates deeper than 3.3MHz T
What is attenuation? the decrease in US intensity as the wave travels through tissue
T or F: increasing protein content decreases absorption? F
What is the percentage of reflection in the air 100%
Almost all US is reflected where? the metal/air interface
When refraction occurs the US enters the tissue at one angle and continues at? A different angle
Gas filled or vapor bubbles caused by US caviataion
Created by: bsa8581