Podcast
Questions and Answers
What is the typical intensity of low-intensity ultrasound used for diagnostic work?
What is the typical intensity of low-intensity ultrasound used for diagnostic work?
What physiological effect is associated with continuous ultrasound at intensities around 1 W/cm²?
What physiological effect is associated with continuous ultrasound at intensities around 1 W/cm²?
What occurs when continuous ultrasound intensity reaches around 35 W/cm²?
What occurs when continuous ultrasound intensity reaches around 35 W/cm²?
Which of the following ultrasound intensities is likely to create micromassage effects?
Which of the following ultrasound intensities is likely to create micromassage effects?
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At what intensity does focused ultrasound begin to selectively destroy deep tissue?
At what intensity does focused ultrasound begin to selectively destroy deep tissue?
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Study Notes
Ultrasonic Wave Effects on the Body
- Ultrasonic waves create physiological and chemical effects within the body.
- The intensity of these effects varies with frequency and amplitude.
- Low intensity ultrasound (around 0.01 W/cm²) doesn't cause harm and is used for diagnostic purposes (like sonar).
- Continuous ultrasound (around 1 W/cm²) leads to deep heating (diathermy) by increasing tissue temperature due to absorbed acoustic energy.
- Continuous ultrasound (1-10 W/cm²) creates pressure differences in tissues (micromassage) due to the sound's movement through compression and rarefaction regions.
- Continuous ultrasound (around 35 W/cm²) can destroy tissue by rupturing DNA molecules.
- Continuous and focused ultrasound (around 10³ W/cm²) can target specific deep tissues for destruction, using a concentrated beam.
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Description
Explore the physiological and chemical effects of ultrasonic waves on the body. Learn how frequency and amplitude influence outcomes, from diagnostic uses to tissue destruction. This quiz highlights applications like diathermy and focused ultrasound therapy.
