Ultrasound Therapy in Physical Therapy

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Questions and Answers

What is the result of the ultrasound wave losing energy as it travels through a medium?

  • Diffraction
  • Interference
  • Refraction
  • Attenuation (correct)

What is the main reason for refraction of ultrasound waves?

  • Change in acoustic impedance at the interface (correct)
  • Change in propagation velocity
  • Change in medium density
  • Change in ultrasound wave frequency

What is the formula to calculate acoustic impedance (Z)?

  • Z = v / r
  • Z = r - v
  • Z = r * v (correct)
  • Z = r / v

What is the purpose of moving the ultrasound head in a circular path during therapy?

<p>To reduce the risk of deep burns due to excessive heat production (B)</p> Signup and view all the answers

What is the term for the amount of energy absorbed by the medium as the ultrasound wave travels through it?

<p>Attenuation (D)</p> Signup and view all the answers

What is the effect of constructive interference on the ultrasound wave?

<p>It increases the amplitude of the ultrasound wave (C)</p> Signup and view all the answers

What is the purpose of using an acoustic lens in ultrasound imaging?

<p>To enhance image quality by refraction (C)</p> Signup and view all the answers

What is the result of standing waves in ultrasound applications?

<p>Deep burns due to excessive heat production (D)</p> Signup and view all the answers

What is the component of the ultrasound machine that produces the ultrasound wave?

<p>Transducer (C)</p> Signup and view all the answers

What is the effect of acoustic impedance mismatch on the ultrasound wave?

<p>It affects the refraction of the ultrasound wave (C)</p> Signup and view all the answers

Flashcards

Attenuation

The decrease in intensity of an ultrasound wave as it passes through a medium due to absorption and scattering.

Refraction

The bending of the ultrasound wave as it passes from one medium to another with a different acoustic impedance.

Acoustic Impedance (Z)

The measure of a material's resistance to the passage of sound waves, calculated by multiplying density (r) by the speed of sound (v) in the material.

Circular Movement

A circular movement of the ultrasound head during therapy to distribute energy and prevent localized heating that could cause tissue damage.

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Constructive Interference

The increase in amplitude of an ultrasound wave when two or more waves interfere constructively, leading to higher energy levels.

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Acoustic Lens

A device used in ultrasound imaging to focus the ultrasound beam for better image quality by refracting the waves to converge at a specific point.

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Standing Waves

The formation of stationary wave patterns in ultrasound therapy, which can lead to excessive heat production and potentially damage tissue.

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Transducer

The component of the ultrasound machine responsible for generating the ultrasound waves, typically made of piezoelectric crystals.

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Acoustic Impedance Mismatch

The difference in acoustic impedance between two mediums, which affects the amount of reflection and transmission of the ultrasound wave at their boundary.

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Ultrasound Imaging

The process of using ultrasound waves to create images of internal organs and tissues.

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