Ch.11 Display Modes

Question 1

What are the basic display modes of ultrasound?

Answer 1

1) Amplitude mode
2) Brightness mode
3) Motion mode

Question 2

A-mode Amplitude appears

Answer 2

as a series of upward spikes.

Question 3

A-mode
The height of the upward deflection is

Answer 3

proportional to the amplitude of the returning echo

Question 4

A-mode:
Strong echoes create

Answer 4

tall spikes, whereas reflections create short spikes

Question 5

A-mode function, As a sound pulse is emitted by the transducer a

Answer 5

dot moves at a constant speed across the system’s display.

Question 6

A-mode:
When a reflection returns to the transducer, it is processed and the

Answer 6

moving dot is deflected upward on the screen

Question 7

A-mode is accurate in determining the

Answer 7

depth of reflectors

Question 8

B-mode (Brightness ; B-scan) appears

Answer 8

as a line of dots of varying brightness

Question 9

B-mode:
The brightness of the dot indicates the

Answer 9

strength of the reflection

Question 10

B-mode:
Weaker reflections appear as ______ _____ _____ , whereas stronger reflections appear as ________ _____ _____.

Answer 10

darker gray dots
brighter white dots

Question 11

B-mode was the

Answer 11

first form of gray scale imaging, it is the basis for all other types of gray scale imaging

Question 12

B-mode:
As a sound pulse is emitted by the transducer, an

Answer 12

invisible dot moves at a constant speed across the system’s display

Question 13

B-mode:
When a reflection returns to the transducer, it is processed and the

Answer 13

invisible dot is turned on

Question 14

M-mode (Motion) appears

Answer 14

as a group of horizontal wavy lines

Question 15

M-mode:
A line that moves up and down on the display indicates

Answer 15

that a reflector is moving closer to or farther away from the transducer

Question 16

M-mode:
A straight horizontal line indicates

Answer 16

a stationary reflector

Question 17

M-mode:
As a sound pulse is emitted by the transducer, the reflections

Answer 17

move at a constant speed from right to left across the screen

Question 18

M-mode:
Various squiggly lines that represent the

Answer 18

changing depth of the reflecting surfaces are produced on the screen

Question 19

M-mode has been used primarily to assess the

Answer 19

motion of cardiac walls and structures; use is declining

Question 20

M-mode info arises from a

Answer 20

single penetration into the body

Question 21

The “sampling rate” of M-mode is

Answer 21

very high and is equal to the pulse repetition frequency of the system

Question 22

Of the 3 modes, M-mode is the only one that provides

Answer 22

information about a reflector’s changing location with respect to time

Question 23

Mode X-axis Y-axis Z-axis
A-Mode

Answer 23

X: reflector depth
Y: amplitude
Z: none

Question 24

Mode X-axis Y-axis Z-axis
B-mode

Answer 24

X: reflector depth
Y: none
Z: amplitude

Question 25

Mode X-axis Y-axis Z-axis
M-mode

Answer 25

X: time
Y: reflector depth
Z: none