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Questions and Answers
What is the range of ultrasonic intensity used for diagnostic work without harmful effects?
What is the range of ultrasonic intensity used for diagnostic work without harmful effects?
~ 0.01 W/cm²
How does continuous ultrasound at ~1 W/cm² affect body tissues?
How does continuous ultrasound at ~1 W/cm² affect body tissues?
It causes a deep heating effect via diathermy, raising tissue temperature.
What physiological effect occurs when continuous ultrasound is applied at powers between 1-10 W/cm²?
What physiological effect occurs when continuous ultrasound is applied at powers between 1-10 W/cm²?
It creates pressure differences in adjacent tissue regions, resulting in micromassage.
What happens to tissue when continuous ultrasound is applied at approximately 35 W/cm²?
What happens to tissue when continuous ultrasound is applied at approximately 35 W/cm²?
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What is the purpose of using focused ultrasound at intensities around 10³ W/cm²?
What is the purpose of using focused ultrasound at intensities around 10³ W/cm²?
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Study Notes
Ultrasonic Wave Effects on the Body
- Ultrasonic waves produce physiological and chemical changes within the body.
- The intensity of these effects depends on frequency and amplitude.
- Low-intensity ultrasound (~0.01 W/cm²) is safe and used in diagnostics (as in sonar).
- Continuous ultrasound (~1 W/cm²) causes deep heating (diathermy), increasing tissue temperature through acoustic energy absorption.
- Continuous ultrasound (1-10 W/cm²) creates pressure differences (micromassage) in tissues from compression and rarefaction.
- Continuous ultrasound (~35 W/cm²) can damage tissue by rupturing DNA molecules.
- High-intensity, focused ultrasound (~10³ W/cm²) can precisely target and destroy deep tissue.
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Description
Explore the fascinating effects of ultrasonic waves on the human body through this quiz. Learn about the physiological and chemical changes, the safety of low-intensity ultrasound, and the potential risks of high-intensity applications. Test your knowledge on how different frequencies and amplitudes impact tissue health.
