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Radiology Final > ULTRASOUND POWERPOINT > Flashcards

ULTRASOUND POWERPOINT Flashcards

1
Q

Ultrasound

A

Above hearing range (>20,000 Hz)

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2
Q

Hz

A

Cycles per second

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3
Q

Ultrasound useful range

A

2-18 megahertz

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4
Q

How many megahertz are needed for ophthalmic

A

50 megahertz

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5
Q

Sound waves are produced when electricity deforms ___________ ___________

A

Piezoelectric crystals

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6
Q

What happens when pressure is applied to a piezoelectric crystal

A

Electricity is generated

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7
Q

Echo

A

Reflection (bouncing off)

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8
Q

Impedance

A

When tissues resist transmission of ultrasound waves (varies in tissues)

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9
Q

What happens when an ultrasound wave is transmitted

A

Passes thru causing no reflection resulting in no image

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10
Q

When there are large impedance differences between interfacing tissues, what is the result

A

Increased reflection and images are generated

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Radiology Final (34 decks)

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