SPI Review
What is frequency determined by? - CORRECT ANSWER-The source, thickness
of piezoelectric element and propagation speed to a lesser degree
Thicker element is equal to ________ frequencies - CORRECT ANSWER-Lower
What is the reciprocal of frequency and what is the symbol - CORRECT
ANSWER-Period, T
The time it takes for 1 cycle to occur - CORRECT ANSWER-Period
What is propagation speed determined by - CORRECT ANSWER-Stiffness and
density of the medium
Propagation speed of sound through soft tissue - CORRECT ANSWER-1,540
m/s
Increasing the stiffness of a tissue does what to the propagation speed? -
CORRECT ANSWER-Increases
Increasing the density of a tissue does what to the propagation speed? -
CORRECT ANSWER-Decreases
Propagation speed of tissues from slowest to fastest - CORRECT ANSWER-Air,
fat, water, liver, blood, muscle, bone
What is the distance over which one cycle occurs? - CORRECT
ANSWER-Wavelength
What happens to frequency when you increase the wavelength? - CORRECT
ANSWER-Decreases
What is the wavelength symbol - CORRECT ANSWER-Lambda
What is the wavelength equation? - CORRECT ANSWER-Propagation speed
divided by the frequency
, Units of wavelength - CORRECT ANSWER-Mm, m, km
What is wavelength determined by? - CORRECT ANSWER-Source and medium
What describes the strength of the sound wave? - CORRECT
ANSWER-Amplitude
What happens to a beam as it travels? - CORRECT ANSWER-Decreases in
amplitude and intensity due to attenuation
What does amplitude represent on the chart of a wave? - CORRECT
ANSWER-The height of a vibration
What does pascals measure? - CORRECT ANSWER-Pressure amplitude
What happens to amplitude when you increase depth? - CORRECT
ANSWER-Decreases due to attenuation
What is amplitude determined by? - CORRECT ANSWER-The source
Related to strength of the beam - CORRECT ANSWER-Power
What is the unit for power? - CORRECT ANSWER-Watts
What is power proportional to? - CORRECT ANSWER-Amplitude squared
Relates to strength of beam and represents the concentration of energy in beam
- CORRECT ANSWER-Intensity
What is the equation and unit for intensity - CORRECT ANSWER-Power/area,
W/cm squared
What is acoustic resistance to sound in a medium? - CORRECT
ANSWER-Impedance
What is frequency determined by? - CORRECT ANSWER-The source, thickness
of piezoelectric element and propagation speed to a lesser degree
Thicker element is equal to ________ frequencies - CORRECT ANSWER-Lower
What is the reciprocal of frequency and what is the symbol - CORRECT
ANSWER-Period, T
The time it takes for 1 cycle to occur - CORRECT ANSWER-Period
What is propagation speed determined by - CORRECT ANSWER-Stiffness and
density of the medium
Propagation speed of sound through soft tissue - CORRECT ANSWER-1,540
m/s
Increasing the stiffness of a tissue does what to the propagation speed? -
CORRECT ANSWER-Increases
Increasing the density of a tissue does what to the propagation speed? -
CORRECT ANSWER-Decreases
Propagation speed of tissues from slowest to fastest - CORRECT ANSWER-Air,
fat, water, liver, blood, muscle, bone
What is the distance over which one cycle occurs? - CORRECT
ANSWER-Wavelength
What happens to frequency when you increase the wavelength? - CORRECT
ANSWER-Decreases
What is the wavelength symbol - CORRECT ANSWER-Lambda
What is the wavelength equation? - CORRECT ANSWER-Propagation speed
divided by the frequency
, Units of wavelength - CORRECT ANSWER-Mm, m, km
What is wavelength determined by? - CORRECT ANSWER-Source and medium
What describes the strength of the sound wave? - CORRECT
ANSWER-Amplitude
What happens to a beam as it travels? - CORRECT ANSWER-Decreases in
amplitude and intensity due to attenuation
What does amplitude represent on the chart of a wave? - CORRECT
ANSWER-The height of a vibration
What does pascals measure? - CORRECT ANSWER-Pressure amplitude
What happens to amplitude when you increase depth? - CORRECT
ANSWER-Decreases due to attenuation
What is amplitude determined by? - CORRECT ANSWER-The source
Related to strength of the beam - CORRECT ANSWER-Power
What is the unit for power? - CORRECT ANSWER-Watts
What is power proportional to? - CORRECT ANSWER-Amplitude squared
Relates to strength of beam and represents the concentration of energy in beam
- CORRECT ANSWER-Intensity
What is the equation and unit for intensity - CORRECT ANSWER-Power/area,
W/cm squared
What is acoustic resistance to sound in a medium? - CORRECT
ANSWER-Impedance
