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SPI > Describing Pulsed Waves > Flashcards

Describing Pulsed Waves Flashcards

1
Q

What are the five parameters used to describe pulsed sound?

A
  1. Pulse duration
  2. Pulse repeition period
  3. Pulse repeition frequency
  4. Duty factor
  5. Spatial pulse length
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2
Q

What is pulsed sound?

A

It is a collection of cycles that travel together

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3
Q

What are the two components of pulsed ultrasound?

A
  1. Transmit, talking, or “on” time
  2. Recieve, listening, or “off” time
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4
Q

What is pulse duration?

A

It is the actual time from start of a pulse to the end of that pulse.

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5
Q

What is the unit for pulse duration?

A

It is reported in units of time.

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6
Q

What is pulse duration determined by?

A

It is determined by the sound source only.

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7
Q

Is the pulse duration adjustable?

A

No.

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8
Q

What are the 2 formulas for pulse duration?

A
  1. PD (us)= # of cycles x period (us)
  2. PD (us)= # of cycles / frequency (Hz)
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9
Q

What is the relationship between pulse duration and the number of cycles in that pulse?

A

Directly proportional

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10
Q

What is the relationship between pulse duration and period?

A

Directly proportional

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11
Q

What is the relationship between pulse duration and frequency?

A

Inversely proprtional.

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12
Q

What characteristics create pulses of long duration?

A

Many cycles in the pulse or individual cycles with long periods.

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13
Q

What characteristics create pulses of short duration?

A

Few cycles in the pulse or individual cycles with short periods.

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14
Q

In clinical imaging, a pulse typically contains how many cycles?

A

2 to 4 cycles.

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15
Q

Which type of pulse is more desirable in diagnostic imaging, and why?

A

Shorter duration pulses are desirable for imaging because they create images if greater accuracy.

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16
Q

What is spatial pulse length?

A

It is the distance from the start of tge oulse to the end.

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17
Q

What is the unit for spatial pulse length?

A

It has units of distance.

18
Q

What is the spatial pulse length determined by?

A

It is determined by both sound source and medium.

19
Q

Is the spatial pulse length adjustable?

A

No.

20
Q

What is the equation of spatial pulse length (mm)?

A

SPL (mm)=# of cycles X wavelength (mm)

21
Q

What is the relationship between SPL and the number of cycles?

A

Directly related.

22
Q

Whta is the relationship between SPL and wavelenght?

A

Directly related

23
Q

What is the relationship between SPL and frequency?

A

Inversely related

24
Q

What is pulse duration?

A

It is the time that a pulse is “on”

25
Q

What is SPL?

A

It is the distance of the pulse from end to end.

26
Q

What characteristics create a long SPL?

A
  • Many cycles in the pulse
  • Cycles with longer wavelength
27
Q

What characteristics create a short SPL?

A
  • Fewer cycles in the pulse
  • Cycles with shorter wavelengths
28
Q

What is pulse repetition period?

A

It is the time from the start of one pulse to the start of the next pulse.

29
Q

What units is PRP reported in?

A

Units of time.

30
Q

What is PRP determined by?

A

Sound source and imaging depth.

31
Q

Is the PRP adjustable?

A

Yes.

32
Q

Which type of pulse is more desirable and why?

A

Pulses of shorter length because they create more accurate images

33
Q

What is the depth of view?

A

It describes the maximum distance into the body that an ultrasound system is imaging.

34
Q

How are pulse repetition period and depth of view related?

A

Directly related.

  • As depth of view increases, PRP increase
  • As depth of view decreases, PRP decrease.
35
Q

What is PRF?

A

It is the number of pulses that an ultrasound system transmits into the body each second.

36
Q

What unit is PRF reported in?

A

Hz

37
Q

What is PRF determined by?

A

Sound source and by the maximum imaging depth of the system.

38
Q

Is the PRF adjustable?

A

Yes; by adjusting the depth of view.

39
Q

What happens to the PRF when the system is imaging shallow?

A

PRF is higher

40
Q

What happens to the PRF when the system is imaging deep?

A

PRF is lower.

41
Q
A

SPI (5 decks)

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