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Flashcards in Display Modes Deck (28):
0

What is a "mode"?

a different way to display something

the displays or formats

1

What are the three modes?

A mode

B mode

M mode

2

What is A Mode?

a series of upward spikes

similar to an oscilloscope/radar

amplitude mode

US pulse is sent, echo returns

3

How are the signals in A mode received?

from different depth displaced on a monitor in a two D format

depth vs amplitude

trace is swept horizontal: the farther to the right the deeper, the higher the more amplitude

4

Who uses A mode?

ophthalmologists - check the retina and eye parts

5

The height of the A Mode spike is....

the amplitude

represents the strength...taller stronger

6

how is A mode measured?

by pulses time of flight

7

does A mode create a picture?

no

8

What is B mode aka?

gray scale

brightness mode

b-scan

9

How is B mode measured?

pulses time of flight

X: depth of reflector (time of flight)

Y: none

Z: amplitude of Echoes, measured by echo strength

10

The higher the ______ the brighter the _____

amplitude

dot

11

what is another way to measure B mode when Y has a measurement?

X: medial and lateral sides

Y: Increasing depth

Z: nothing

12

What is time of flight?

Pluse echo

or Range Equation

13

What is the Range Equation?

distance to reflector= speed X round trip time/2

soft tissue D=0.77 t

14

How long does it take a pulse to go 1 cm?

13 microseconds

see slide 19 MEMORIZE

15

The _______ the reflection the ___________ the pixel

stronger

brighter

then creates a picture (a dot = pixel)

16

What is a pixel?

a picture element

17

Strong reflectors create what kind of picture?

hyperechoic - bright

aka echogenic

18

weak reflectors create what type of image?

hypoechoic

19

absent reflectors create what kind of image?

anechoic

20

What mode is called "shades of Gray?"

B mode

21

what is gray scale and gray map?

mode B

22

What is M mode?

aka: motion, time, T-M mode

changing position of reflectors with respect to time

NOT related to echo amplitude

related to location

23

M mode is for motion of _______structures

cardiac

24

M Mode axis:

X: time

Y: depth

25

How is M mode measured?

by time of flight (range equation)

26

2D imaging is based on which mode?

B mode

27

in A-mode, what is represented in the X axis? Y axis?

X: depth (measured by time of flight)

Y: amplitude ( measured by echo strength)