Flashcards in Display Modes Deck (28):
What is a "mode"?
a different way to display something
the displays or formats
What are the three modes?
What is A Mode?
a series of upward spikes
similar to an oscilloscope/radar
US pulse is sent, echo returns
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
Who uses A mode?
ophthalmologists - check the retina and eye parts
The height of the A Mode spike is....
represents the strength...taller stronger
how is A mode measured?
by pulses time of flight
does A mode create a picture?
What is B mode aka?
How is B mode measured?
pulses time of flight
X: depth of reflector (time of flight)
Z: amplitude of Echoes, measured by echo strength
The higher the ______ the brighter the _____
what is another way to measure B mode when Y has a measurement?
X: medial and lateral sides
Y: Increasing depth
What is time of flight?
or Range Equation
What is the Range Equation?
distance to reflector= speed X round trip time/2
soft tissue D=0.77 t
How long does it take a pulse to go 1 cm?
see slide 19 MEMORIZE
The _______ the reflection the ___________ the pixel
then creates a picture (a dot = pixel)
What is a pixel?
a picture element
Strong reflectors create what kind of picture?
hyperechoic - bright
weak reflectors create what type of image?
absent reflectors create what kind of image?
What mode is called "shades of Gray?"
what is gray scale and gray map?
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
M mode is for motion of _______structures
M Mode axis:
How is M mode measured?
by time of flight (range equation)
2D imaging is based on which mode?