Definitions
Formulas/Equations
Sound
Formats
Random
100
The number of complete cycles that occur in 1 second of time
Frequency
100
13 microsecond rule
It takes 13 microseconds for sound to travel 1 cm and back in soft tissue
100
Sound must have a ___________________ to travel through
Medium
100
What type of format does a linear transducer display?
rectangular display
100
What is the speed of sound in soft tissue?

1540 m/s

1.54 km/s

1.54 mm/microsecond

200
Length of time it takes for 1 single cycle to occur
Period
200
Distance formula
Distance = rate of speed x time of travel
200
A wave transports __________________ from one location to another
Energy
200
What type of format does a sector transducer display?
Pie or wedge shape
200
How is ultrasound imaging accomplished?
Pulse-echo technique
300
An area within a wave that has increased pressure and density
Compression
300
Imaging Depth
Rate x Time / 2
300
A sound wave can be described as _________________&_____________________
Mechanical & Longitudinal
300
What determines the starting points and paths for the scan lines?
Scan format
300
The brightness of the dot displayed on the machine corresponds to the _________________ of the echo
Strength
400
An area within a wave that have decreased pressure and decreased particle density
Rarefaction
400
Formula for Frequency & Period

F=1/P

P=1/F

400
Ultrasound is defined as greater than ___________________ Hz.
20,000
400
Which format generates pulses from different starting points that all travel in the same direction
Linear
400
The location of each dot corresponds to the _________________ of the echo return
Time
500
A change in frequency resulting from motion
Doppler Effect
500

How do the following decibels change the intensity?

+3dB

+6dB

-9dB

-10dB

+20dB

+3dB = Doubles (2x original)

+6dB = Quadruples (4x original)

-9dB = 1/8 the original

-10dB = 1/10 the original

+20dB = 100x the original

500
What are the 4 acoustic variables?

Pressure

Density

Distance

Temperature

500
Which format generates a pulse that originates from the same starting point but travel in different directions?
Sector
500
Fine the period if the frequency is 5 MHz
0.0000002 microseconds
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