SPI ultrasound physics review| 135 QUESTIONS|
WITH COMPLETE SOLUTIONS
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 the equation for impedance? Correct Answer: Density times propagation
speed
What is impedance determined by and what are the units? Correct Answer: The
medium, rayls
The bigger the mismatch, the stronger Correct Answer: The reflection and brighter
the dot
WITH COMPLETE SOLUTIONS
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 the equation for impedance? Correct Answer: Density times propagation
speed
What is impedance determined by and what are the units? Correct Answer: The
medium, rayls
The bigger the mismatch, the stronger Correct Answer: The reflection and brighter
the dot
