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Ultrasound Physics: Attenuation & Impedance

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Ultrasound Physics: Attenuation & Impedance

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Questions and Answers

What is attenuation in the context of sound waves traveling through tissue?

The reflection of ultrasound waves back to the probe

The ability of bone to allow ultrasound waves to penetrate deeply

The wearing of energy in the sound beam due to scattering and absorption (correct)

The increase of sound energy as it passes through soft tissues

Which tissues are likely to have high impedance?

Cartilage and nerve tissues

Blood vessels and skin

Bone and ligaments (correct)

Fat and muscle

How does refraction occur with ultrasound waves?

When sound waves scatter in different directions

When ultrasound waves reflect back at a consistent rate

When ultrasound waves are absorbed by the tissues

When ultrasound waves hit the boundary at an angle other than 90 degrees (correct)

What causes the reflection of ultrasound waves?

<p>Differences in tissue consistency causing waves to bounce back</p> Signup and view all the answers

Which statement regarding tissue impedance is correct?

<p>Muscle has low impedance, allowing for greater sound wave penetration.</p> Signup and view all the answers

Study Notes

Attenuation

Attenuation describes energy loss in a sound beam as it passes through tissue.
Loss is due to scattering and absorption.

Impedance

Tissues with high collagen content (like bone, periosteum, capsules, ligaments) have high impedance and high absorption.
Tissues with low collagen content (muscle, blood vessels, skin, fat) have low impedance and high penetration.

Refraction

Ultrasound waves encounter the boundary between different tissues at an angle other than 90 degrees, causing refraction.

Reflection

Ultrasound waves encounter tissue and reflect back to the probe.
Reflection rate depends on the tissue's consistency.

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Description

This quiz covers key concepts in ultrasound physics including attenuation, impedance, refraction, and reflection of sound waves in various tissues. Understanding these topics is essential for interpreting ultrasound imaging effectively. Test your knowledge on how these factors influence sound beam behavior in the human body.