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SPI > Pulsed Waves > Flashcards

Pulsed Waves Flashcards

1
Q

What are the 5 parameters describing pulsed sound?

A
  1. Duty Factor
  2. Pulse duration
  3. Pulse Repetition Period
  4. Pulse Repetition Frequency
  5. Spatial Pulse Length
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2
Q

What is a collection of cycles that travel together?

A

A pulse of ultrasound

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3
Q

True or False, a pulse must have a beginning and an end?

A

True

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4
Q

True or False A pulse is made of individual cycles and propagates as individual pulses.

A

False, a pulse travels as a single unit.

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5
Q

What is another term for a pulses “on time”?

A

transit or talking time

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6
Q

What is another term for a pulses “ off time”?

A

Receive or listening time

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7
Q

What is the term used to describe the actual time a pulse starts and ends?

A

Pulse duration

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8
Q

What represents the single talking time of a pulse?

A

Pulse duration

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9
Q

What are the units of pulse duration?

A

Time

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10
Q

What is pulse duration determined by?

A

by the sound source

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11
Q

Is pulse duration adjustable?

A

No

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12
Q

What is the equation for pulse duration?

A

PD = # of cycles x period
# of cycles / frequency

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13
Q

What is pulse duration directly proportional to?

A

Number of cycles of a pulse and period

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14
Q

What is pulse duration inversely related to?

A

Frequency

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15
Q

What characteristics of a pulse create a pulse of long duration?

A

many cycles or individual cycles with a long period.

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16
Q

What characteristics of a pulse create a pulse of a short duration?

A

Few cycles or individual cycles with a short period.

17
Q

Is a short or long-duration pulse desired to create an image with greater accuracy?

A

short duration pulse

18
Q

What term is used to describe the distance from the start of the pulse to the end of that same pulse?

A

spatial pulse length

19
Q

What are the units of spatial pulse length?

A

units of distance

20
Q

What is spatial pulse length determined by?

A

Both source and medium

21
Q

What is the equation for spatial pulse lenght?

A

SPL= # of cycles x wavelength

22
Q

True or False Spatial pulse length & wavelength are both determined by sound source and medium?

A

True

23
Q

Are you able to adjust spatial pulse length?

A

No

24
Q

What is spatial pulse length directly proportional to?

A

of cycles in a pulse & wavelength

SPI (10 decks)

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