11/15 Quiz

Question 1

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

Answer 1

Depth
Amplitude

Question 2

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

Answer 2

Depth
Amplitude

Question 3

Your standard series of dots with varied brightness

Answer 3

B-Mode

Question 4

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

Answer 4

Time
Depth

Question 5

CRT stands for

Answer 5

Cathode Ray Tube

Question 6

Cathode also known as

Answer 6

Electron gun

Question 7

What is an important component of CRT

Answer 7

Anode or focusing coil

Question 8

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

Answer 8

Postitive charge
Eliminates stray electrons

Question 9

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

Answer 9

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

Question 10

Selection of portion that is magnified

Answer 10

ROI - Region of interest

Question 11

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

Answer 11

Write Magnification

Question 12

What are the steps of write magnification

Answer 12

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

Question 13

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

Answer 13

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

Question 14

Is performed after the image is stored in the scan converter

Answer 14

Read magnification

Question 15

Steps for read magnification

Answer 15

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

Question 16

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

Answer 16

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

Question 17

What is shown to the sonographer by instrument

Answer 17

Display

Question 18

What is recorded by the instrument for future reference

Answer 18

Storage

Question 19

Draw diagram of CRT

Answer 19

Image on Ch. 6 Review

Question 20

List the 4 characteristics of imaging

Answer 20

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

Question 21

List 4 Characteristics of Doppler

Answer 21

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

Question 22

Aliasing is increased with what 3 things

Answer 22

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

Question 23

What are the 5 ways to clean up aliasing

Answer 23

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

Question 24

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

Answer 24

Increase Nyquist limit

Question 25

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

Answer 25

Increase Nyquist limit

Question 26

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

Answer 26

Decreases Doppler shift

Question 27

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

Answer 27

Display looks better

Question 28

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

Answer 28

No aliasing but range ambiguity

Question 29

What are the equations for Doppler shift

Answer 29

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

Question 30

A-Mode has no

Answer 30

Image

Question 31

What is A-Mode

Answer 31

Amplitude Mode

Question 32

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

Answer 32

Lightening of the image

Question 33

What is B-Mode

Answer 33

Brightness mode

Question 34

What mode do you use in general U/S

Answer 34

B-Mode

Question 35

What type of image does B-Mode produce

Answer 35

3-D

Question 36

What is M-Mode

Answer 36

Motion Mode

Question 37

What mode is used in echo U/S

Answer 37

M-Mode

Question 38

M-Mode makes

Answer 38

Wave forms

Question 39

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

Answer 39

A

Question 40

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

Answer 40

A & B

Question 41

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

Answer 41

C

Question 42

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

Answer 42

D & E

Question 43

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

Answer 43

E

Question 44

With binary number which side do you start with ?

Answer 44

Right

Question 45

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

Answer 45

256

Question 46

What does SOG stand for

Answer 46

Shades of gray

Question 47

If the computer gives you IOII what is the SOG

Answer 47

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

Question 48

Draw an example of B-Mode

Answer 48

Sag Right Liver w/ Kidney Interface Image

Question 49

Draw an example of M-Mode

Answer 49

Image box with pulse waves under for HR

Question 50

The phosphors in the CRT diagram does what

Answer 50

Activated GRB generates color

Question 51

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

Answer 51

Positice anode Collects stray electrons