Chapter 11

Question 1

what are the 3 basic modes or formats of viewing ultrasound information?

Answer 1

amplitude, brightness, and motion

Question 2

______ appears as a series of upward spikes

Answer 2

A-mode (looks like a big city skyline)

Question 3

in this mode, as a sound pulse is emitted by the transducer, a dot moves at a constant speed across the systems display, when a reflection returns to the transducer it is processed and the moving dot is deflected upward on the screen

Answer 3

A-mode- the hight of the upward deflection is proportional to the amplitude of the returning echo

Question 4

strong echos create ______ spikes, weak reflections create ______ spikes

Answer 4

tall, short

Question 5

the ______ of the A-mode display represents reflector depth, which is derived from the time-of-flight information of the sound pulse

Answer 5

x-axis (horizontal)

Question 6

the ______ represents reflection amplitude in A-mode

Answer 6

y-axis (vertical)

Question 7

A-mode is accurate in determining the ______ of reflectors

Answer 7

depth

Question 8

______ appears as a line of dots of varying brightness

Answer 8

B-mode- it is the basis for all other types of gray scale imaging

Question 9

in this mode, as a sound pulse is emitted by the transducer an invisible dot moves at a constant speed across the systems display, when a reflection returns to the transducer it is processed and the invisible dot is turned on

Answer 9

B-mode- the brightness of the dot indicates the strength of the reflection

Question 10

weaker reflections appear as ______ gray dots, stronger reflections appear as ______ white dots

Answer 10

darker, brighter

Question 11

the ______ of a B-mode represents reflector depth, which is derived from the time-of-flight information of the sound pulse

Answer 11

x-axis

Question 12

when displayed on an oscilloscope, the amplitude information of a B-mode is routed into the ______

Answer 12

z-axis

Question 13

______ appears as a group of horizontal wavy lines

Answer 13

M-mode

Question 14

in this mode, as a sound pulse is emitted by the transducer the reflection move at a constant speed from right to left across the screen, various squiggly lines that represent the changing depth of the reflecting surfaces are produced on the screen

Answer 14

M-mode- a line that moves up and down on the display indicates that a reflector is moving closer to or farther away from the transducer

Question 15

A ______ horizontal line indicates a stationary reflector on M-mode

Answer 15

straight

Question 16

the ______ of an M-mode displays represent time

Answer 16

x-axis (horizontal)

Question 17

the ______ represents reflector depth, which is derived from the time-of-flight information of the sound pulse

Answer 17

y-axis

Question 18

the ______ of M-mode is very high and is equal to the pulse repetition frequency of the system

Answer 18

sampling rate

Question 19

______ is the only mode that provides information about a reflectors changing location with respect to time

Answer 19

M-mode