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Ultrasound Physics > 11/15 Quiz > Flashcards

11/15 Quiz Flashcards

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1
Q

In A-Mode the X- Axis represents:
In A-Mode the Y-Axis represents:

A

Depth
Amplitude

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2
Q

In B-Mode the X-Axis represents:
In B-Mode the Z-Axis Represents:

A

Depth
Amplitude

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3
Q

Your standard series of dots with varied brightness

A

B-Mode

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4
Q

In M-Mode the X-Axis represents
In M-Mode the Y-Axis represents

A

Time
Depth

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5
Q

CRT stands for

A

Cathode Ray Tube

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6
Q

Cathode also known as

A

Electron gun

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7
Q

What is an important component of CRT

A

Anode or focusing coil

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8
Q

The focusing coil of the CRT have what type of charge applied which then eliminates

A

Postitive charge
Eliminates stray electrons

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9
Q

Magnification is used to improve
Means that a portion of the image is

A

Visualization of a portion of an image
Enlarged to fill the entire screen

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10
Q

Selection of portion that is magnified

A

ROI - Region of interest

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11
Q

This is performed while the data is being read in, before stage in the scan converter

A

Write Magnification

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12
Q

What are the steps of write magnification

A

Scan
Convert A to D and store data in scan converter
Identify ROI - System discard data in scan converter
System rescans only region of interest and writes new data

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13
Q

Characteristics of Write Magnification:
Image used to -
Number of pixels or scan lines -
Increased number of

A

Used to identify ROI is discarded
In ROI image is greater than that of the ROI portion in original image
Pixels in ROI improves spatial resolution

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14
Q

Is performed after the image is stored in the scan converter

A

Read magnification

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15
Q

Steps for read magnification

A

Scan patient
Convert A to D; Store data in scan converter
Sonographer select ROI; System reads and displays only that info

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16
Q

Characteristics of read info:
Number of pixels in magnified images -
Spatial resolution -
Can be done on

A

Same as original
Does not change & pixels are larger in zoomed in image than original
Frozen image

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17
Q

What is shown to the sonographer by instrument

A

Display

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18
Q

What is recorded by the instrument for future reference

A

Storage

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19
Q

Draw diagram of CRT

A

Image on Ch. 6 Review

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20
Q

List the 4 characteristics of imaging

A

Normal incidence
High f - Improves resolution
PW Only
Min 1 crystal

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21
Q

List 4 Characteristics of Doppler

A

0-180
Low f - Avoids aliasing
CW & PW
Min 1 Pulse; 2 Continuous

22
Q

Aliasing is increased with what 3 things

A

Faster blood flow velocity
Higher f transducers
Deep gates (Low PRF)

23
Q

What are the 5 ways to clean up aliasing

A

Adjust scale max
Select new window with shallow sample volume
Use low f transducer
Use baseline shift
Use CW Doppler

24
Q

When cleaning up aliasing with adjusting the scale to its max what does that cause

A

Increase Nyquist limit

25
Q

When cleaning up aliasing with selecting a new window with shallow sample volume what does that cause

A

Increase Nyquist limit

26
Q

When cleaning up aliasing with using a lower frequency transducer what does that cause

A

Decreases Doppler shift

27
Q

When cleaning up aliasing with using a baseline shift what does that cause

A

Display looks better

28
Q

When cleaning up aliasing with using CW Doppler what does that cause

A

No aliasing but range ambiguity

29
Q

What are the equations for Doppler shift

A

DS = Reflected frequency - Transmitted frequency
fD = 2fovcos0/c

30
Q

A-Mode has no

A

Image

31
Q

What is A-Mode

A

Amplitude Mode

32
Q

When using A-Mode when you have a higher amplitude what does that cause

A

Lightening of the image

33
Q

What is B-Mode

A

Brightness mode

34
Q

What mode do you use in general U/S

A

B-Mode

35
Q

What type of image does B-Mode produce

A

3-D

36
Q

What is M-Mode

A

Motion Mode

37
Q

What mode is used in echo U/S

A

M-Mode

38
Q

M-Mode makes

A

Wave forms

39
Q

In the Doppler shift drawing (in your notes) which has the greatest positive shift?
A, B, C, D, or E

A

A

40
Q

In the Doppler shift drawing (in your notes) which has the greatest frequency
A, B, C, D, or E

A

A & B

41
Q

In the Doppler shift drawing (in your notes) which has the same frequency as the transducer
A, B, C, D, or E

A

C

42
Q

In the Doppler shift drawing (in your notes) which has the lower frequency
A, B, C, D, or E

A

D & E

43
Q

In the Doppler shift drawing (in your notes) which has the greatest negative Doppler shift
A, B, C, D, or E

A

E

44
Q

With binary number which side do you start with ?

A

Right

45
Q

How many shades of gray are there that the human eye can distinguish

A

256

46
Q

What does SOG stand for

A

Shades of gray

47
Q

If the computer gives you IOII what is the SOG

A

2^0 + 2^1 + 2^3
1 + 2 + 8 = 11th SOG

48
Q

Draw an example of B-Mode

A

Sag Right Liver w/ Kidney Interface Image

49
Q

Draw an example of M-Mode

A

Image box with pulse waves under for HR

50
Q

The phosphors in the CRT diagram does what

A

Activated GRB generates color

51
Q

The focusing coil in the CRT diagram is a ____ anode does what

A

Positice anode
Collects stray electrons

Ultrasound Physics (6 decks)

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