11/15 Quiz Flashcards

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
When cleaning up aliasing with selecting a new window with shallow sample volume what does that cause
Increase Nyquist limit
26
When cleaning up aliasing with using a lower frequency transducer what does that cause
Decreases Doppler shift
27
When cleaning up aliasing with using a baseline shift what does that cause
Display looks better
28
When cleaning up aliasing with using CW Doppler what does that cause
No aliasing but range ambiguity
29
What are the equations for Doppler shift
DS = Reflected frequency - Transmitted frequency fD = 2fovcos0/c
30
A-Mode has no
Image
31
What is A-Mode
Amplitude Mode
32
When using A-Mode when you have a higher amplitude what does that cause
Lightening of the image
33
What is B-Mode
Brightness mode
34
What mode do you use in general U/S
B-Mode
35
What type of image does B-Mode produce
3-D
36
What is M-Mode
Motion Mode
37
What mode is used in echo U/S
M-Mode
38
M-Mode makes
Wave forms
39
In the Doppler shift drawing (in your notes) which has the greatest positive shift? A, B, C, D, or E
A
40
In the Doppler shift drawing (in your notes) which has the greatest frequency A, B, C, D, or E
A & B
41
In the Doppler shift drawing (in your notes) which has the same frequency as the transducer A, B, C, D, or E
C
42
In the Doppler shift drawing (in your notes) which has the lower frequency A, B, C, D, or E
D & E
43
In the Doppler shift drawing (in your notes) which has the greatest negative Doppler shift A, B, C, D, or E
E
44
With binary number which side do you start with ?
Right
45
How many shades of gray are there that the human eye can distinguish
256
46
What does SOG stand for
Shades of gray
47
If the computer gives you IOII what is the SOG
2^0 + 2^1 + 2^3 1 + 2 + 8 = 11th SOG
48
Draw an example of B-Mode
Sag Right Liver w/ Kidney Interface Image
49
Draw an example of M-Mode
Image box with pulse waves under for HR
50
The phosphors in the CRT diagram does what
Activated GRB generates color
51
The focusing coil in the CRT diagram is a ____ anode does what
Positice anode Collects stray electrons