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Chapter 10: Therapeutic Ultrasound

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Penetration and absorption are inversely related.

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a. True

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b. False

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a. True

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Three MHZ frequency ultrasound is absorbed deeper and faster than 1 MHz.

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a. True

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b. False

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b. False

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A low beam nonuniformity ratio (BNR) results in uneven heating.

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a. True

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b. False

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b. False

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The decrease in energy intensity of the ultrasound wave as it is scattered and dispersed while traveling through various tissues is known as which of the following?

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a. Acoustic impedance

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b. Attenuation

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c. Rarefaction

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d. Compression

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b. Attenuation

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A(n) ____ may develop when standing waves form at tissue interfaces and reflected energy meets transmitted energy increasing the intensity.

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a. Hot spot

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b. Impedance

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c. Rarefaction

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d. Collimated beam

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a. Hot spot

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Which of the following is NOT a nonthermal effect of ultrasound?

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a. Acoustic microstreaming

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b. Cavitation

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c. Increased collagen extensibility

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d. Increased fibroblast activity

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c. Increased collagen extensibility

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Which of the following is the LEAST effective ultrasound coupling method?

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a. Massage lotion

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b. Ultrasonic gel

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c. Water immersion

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d. Bladder technique

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a. Massage lotion

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Ultrasound may be used to treat which of the following?

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a. Bone fracture

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b. Pain

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c. Plantar warts

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d. All of the above

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d. All of the above

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