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CHAPTER SIXTEEN. Ultrasound

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The ultrasound frequency range used to facilitate tissue repair and wound healing is

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a. Less than 20 KHz

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b. 40 KHz-3 MHz

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c. 3-7 MHz

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d. 8-18 MHz

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The amount of energy (W) per area of the sound head (cm2) delivered during a treatment time, expressed as W/cm2 is

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a. Duty cycle

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b. Frequency

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c. Voltage

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d. Intensity

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The formation of gaseous bubbles that implode, thereby releasing pressure that may cause tissue damage and facilitate breakdown of necrotic tissue, is termed

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a. Microstreaming

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b. Stable cavitation

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c. Unstable cavitation

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d. Banding

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Which of the following parameters is recommended to avoid the thermal effects on tissue when using high-frequency, contact ultrasound?

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a. Pulsed mode with 25% duty cycle

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b. Maximum of 5 minutes treatment time

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c. Water as the conduction medium

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d. 1 MHz frequency

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Which of the following conditions is an absolute contraindication for the use of noncontact, low-frequency ultrasound?

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a. Vasculitis

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b. Any painful wound

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c. Arterial insufficiency

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d. Malignant tissue

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Ultrasound is indicated in any of the wound healing phases except

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a. Hemostasis

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b. Inflammation

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c. Proliferation

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d. Remodeling

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