Ultrasound

Fill in the blank: Ultrasound most effectively heats deep tissue with a high collagen content such as ________, ligaments, joint capsules, and fascia.

• tendons

• muscles

• arteries

• nerves

What is the primary effect produced by low-intensity pulsed ultrasound?

• Thermal effects

• Nonthermal effects

• Electrical effects

• Chemical effects

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Low-intensity pulsed ultrasound is generally used to promote _________

• tissue repair

• muscle fatigue

• bone fracture

• nerve conduction

What is ultrasound? Fill in the blank: Ultrasound is a type of ______ that consists of waves that transmit energy by alternately compressing and rarefying material.

• sound

• light

• heat

• electricity

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What does attenuation mean in the context of ultrasound? Fill in the blank: Attenuation is the ______ in ultrasound intensity as ultrasound travels through tissue.

• decrease

• increase

• reflection

• generation

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How is ultrasound generated in an ultrasound unit?

• By applying a low-frequency, direct electrical current to the crystal

• By applying a high-frequency, alternating electrical current to the crystal in the transducer

• By heating the crystal in the transducer

• By applying pressure to the crystal

What property of the crystal in an ultrasound transducer allows it to expand and contract at the same frequency as the current changes polarity?

• Piezoelectric properties

• Thermal conductivity

• Magnetic susceptibility

• Optical clarity

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What does 'ERA' stand for in the context of the ultrasound transducer face?

• Effective Radiating Area

• Electromagnetic Resonance Area

• Echo Reflection Area

• Energy Radiance Assessment

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What does ultrasound generally heat compared to superficial heating agents?

• Ultrasound generally heats smaller, deeper areas than superficial heating agents.

• Ultrasound generally heats larger, superficial areas than superficial heating agents.

• Ultrasound generally heats only the skin surface.

• Ultrasound generally does not produce any heating effect.

Which of the following is an effect of ultrasound that is also seen with superficial heating agents?

• A) Accelerated metabolic rate

• B) Increased pain

• C) Decreased circulation

• D) Reduced soft tissue extensibility