Understanding ultrasound physics chapter 11

format

method of display viewing ultrasound information

A-mode, amplitude

appears as a series of upward spikes

A-mode display is created by

as the 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

the X-axis of A mode represents

depth

the y-axis of A mode represents

amplitude, strength

the height of the upward deflection is proportional to the _________ of the returning echo

amplitude

A-mode is accurate in determining the

depth of reflectors

this feature is exclusively used in

ophthalmology

b-mode, brightness

appears as a line of dots of varying brightness

B-mode displays are created by

as a sound wave is emitted by the transducer, an invisible dot moves at a constant speed across the systems display

-when the reflection returns to the transducer, the invisible dot is turned on

the brightness of the dots indicates the

strength of the reflection

the x axis of b mode represents

depth

when displayed on an oscilloscope, the _________ of B-mode is routed to the __ axis

amplitude, Z

B-mode was the first form of

gray scale imaging

M-mode, motion

appears as a group of horizontal wavy lines

M-mode displays are created as follows

-as a sound pulse is emitted by the transducer, the reflections move at a constant speed from right to left

-various squiggly lines that represent the changing depth of the reflecting surfaces

a straight horizontal line in M-mode indicates

a stationary reflector

the X axis of an M-mode display represents

time

the Y-axis of an M-mode display represents

depth

M-mode is the only one the provides information about

a reflector's changing location with respect to time

with a-mode, what is displayed on the x-axis?

depth of the reflector

with M-mode, what is displayed on the y-axis?

depth of the reflector

which mode provides the foundation for real-time, gray scale anatomic imaging?

b-mode, brightness

with a-mode, what is displayed on the y-axis?

amplitude of the reflected signal

in M-mode, what is displayed on the x-axis?

time

with b-mode, which axis is related to the strength of the reflection?

z-axis