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Physics 2 > Lesson 1 > Flashcards

Lesson 1 Flashcards

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1
Q

What is the formula for frequency?

A

f = 1/T

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2
Q

What is the formula for period?

A

T = 1/f

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3
Q

What is the formula for wavelength?

A

lambda = c/f

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4
Q

What is the formula for pulse duration?

A

PD = T x n

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5
Q

What is the formula for pulse repetition frequency?

A

PRF = 1/PRP

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6
Q

What is the formula for pulse repetition period?

A

PRP = 1/PRF

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7
Q

What is the formula for intensity?

A

I = P/A

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8
Q

What is the relationship between intensity and amplitude?

A

I = Amp ^2

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9
Q

Doppler effect

A

Change in frequency caused by the motion of a source, reflector or receiver

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10
Q

Doppler shift

A

Quantification of the change in frequency

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11
Q

What happens to the frequency as you get closer?

A

It increases

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12
Q

What happens to the frequency as you get farther?

A

It decreases

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13
Q

What kind of doppler shift do you get if you move closer?

A

Positive shift

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14
Q

What kind of doppler shift do you get if you move farther?

A

Negative shift

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15
Q

What do we do in doppler? (3)

A
  1. Fire a particular frequency
  2. Measure the frequency that returns
  3. Figure out the Doppler shift
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16
Q

What can we calculate with doppler?

A

How fast an object is moving

17
Q

What is the formula for doppler shift?

A

Fd = Fr - Ft

18
Q

What is the formula for velocity with doppler shift?

A

V(cc/s) = 77(cm/ms) x Fd (kHz)/ f (MHz)

19
Q

Doppler angle

A

The angle of incident beam to the blood flow

20
Q

What happens if you increase you doppler angle?

A

Decrease your Doppler shift

21
Q

What happens if you decrease you doppler angle?

A

Increase your Doppler shift

22
Q

What does a higher doppler angle mean?

A

Our velocity will be calculated too low

23
Q

Where must angle correct be kept at?

A

60 deg

- to the vessel

24
Q

What does doppler show? (5)

A
  1. Presence
  2. Direction
  3. Speed
  4. Character
  5. Quantification
25
Q

What are the colour doppler controls? (6)

A
  1. Box
  2. Map
  3. Invert
  4. Baseline
  5. Gain
  6. Wall filter
26
Q

What are the spectral doppler controls? (5)

A
  1. Gate size/sample volume
  2. Gain
  3. Spectral invert
  4. Baseline
  5. Wall filter
27
Q

What does PRF affect?

A

Scale

28
Q

Where can you only change PRF?

A

In doppler

- there is no pulses in grey scale

29
Q

What happens when you decrease PRF?

A

Your scale decreases

30
Q

What does decreasing your PRF allow to show?

A

Slower flow speeds

31
Q

What happens if you decrease the PRF too much?

A

It will cause aliasing

- wrap around

32
Q

What does increasing PRF allow?

A

Increase in scale

33
Q

What does increase PRF try and show?

A

Faster flow speeds

34
Q

What does increasing the PRF too much do?

A

Doesnt show slow speeds well

35
Q

What does phasing allow?

A

Steering

Physics 2 (10 decks)

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