| TRANSDUCERS | DEFINITIONS | TERMS | MEASUREMENTS | MISCELLANEOUS |
|---|---|---|---|---|
|
What produces a rectangular image
Linear probe
|
What is period
The time it takes for one complete cycle to occur
|
What can we describe sound as
mechanical and longitudinal
|
What is distance
Rate of speed x time of travel
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What will frequency affect
Penetration and image resolution
|
|
What probe shows a pie or wedge shape
Sector
|
What is frequency
The number of complete cycles that occur in 1 second of time
|
What is Doppler effect
The change in frequency resulting from motion
|
What is the speed of sound in soft tissue
1540 m/s, 1.54 mm/us, 1.54 km/s
|
What does sound need to travel through
A medium
|
|
What is frequency controlled by
Transducer
|
What is sound
The sensation produced by vibrations reaching the organs of hearing through a gas, liquid or medium
|
How is ultrasound imaging accomplished
Pulse-echo technique
|
What is a positive decibel
Increase in value of intensity
|
What does a wave transport
Energy
|
|
What is the measurement for frequency
Hertz
|
What is compression
An area of increased particle density
|
What does Doppler detect
Motion of red blood cells
|
What is the 13 microsecond rule
It takes 13 microseconds for sound to travel 1 cm and back in soft tissue
|
What is audible sound
Within the range of human hearing between 20-20,000 Hz
|
|
What is the frequency range for US transducers
2.0-12.0 Hz
|
What is wave
A disturbance that travels through a medium and moves its energy from one location to another
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What does the brightness of each dot correspond to
The strength of the reflector
|
What is the relationship between period and frequency
Inversely related or reciprocals
|
What are the four acoustic variables
Pressure, Density, Particle motion(distance), Temperature
|
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