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Chapter 10: Therapeutic Ultrasound

Penetration and absorption are inversely related.

a. True

b. False

a. True

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

a. True

b. False

b. False

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

a. True

b. False

b. False

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?

a. Acoustic impedance

b. Attenuation

c. Rarefaction

d. Compression

b. Attenuation

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

a. Hot spot

b. Impedance

c. Rarefaction

d. Collimated beam

a. Hot spot

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

a. Acoustic microstreaming

b. Cavitation

c. Increased collagen extensibility

d. Increased fibroblast activity

c. Increased collagen extensibility

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

a. Massage lotion

b. Ultrasonic gel

c. Water immersion

d. Bladder technique

a. Massage lotion

Ultrasound may be used to treat which of the following?

a. Bone fracture

b. Pain

c. Plantar warts

d. All of the above

d. All of the above

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