Ultrasound Physics: Chapter 3 review Questions with
Answers (100% Correct Answers)
The ability to resolve structures lying perpendicular to the axis of the ultrasound beam is called
a. Lateral resolution
b. Axial resolution
c. Depth resolution
d. Longitudinal resolution —Answer: a. Lateral resolution
Generally, ultrasound transducer have
a. Better axial resolution than lateral resolution
b. Better lateral resolution than axial resolution
c. Better azimuthal resolution than radial resolution
d. Equal axial and lateral resolution —Answer: a. Better axial resolution than lateral resolution
Which of the following are most commonly used in ultrasound transducers
a. Lead zirconate titanate (PZT)
b. Barium sulfate
c. Metaniobate
d. Quartz —Answer: a. Lead zirconate titanate (PZT)
Which of the following varies with distance from the transducer?
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,a. Lateral resolution
b. Frequency
c. Axial resolution
d. Special pulse length —Answer: a. Lateral resolution
Increasing axial resolution by increasing frequency results in
a. Increasing penetration
b. Decreasing half-intensity depth
c. Decreasing the pulse repetition frequency
d. None of the above —Answer: b. Decreasing half-intensity depth
Transducers are focused by two major methods: internal focusing and external focusing. These
methods can be accomplished by
a. Thickening the crystal and adding a water path
b. Cutting a curved transducer element and/or using an acoustic lens
c. Draping the crystal with metal ions and damping
d. Using a crystal pulse and a bandwidth limiter
e. All of the above will focus a transducer element —Answer: b. Cutting a curved transducer
element and/or using an acoustic lens
The unit applied to the Q factor (quality factor) that describes the ratio of operating frequency to
bandwidth is called
a. Megahertz (MHz)
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, b. Percent
c. Millimeters per microsecond
d. Fresnel
e. None of the above —Answer: e. none of the above
The backing material that is usually constructed in a continuous wave Doppler transducer is
a. Epoxy resin
b. Cork
c. Air
d. Tungsten powder
e. None of the above —Answer: e. None of the above
The intensity of the ultrasound beam
a. Is measured in watts
b. Is always constant
c. Depends on beam diameter
d. Is measured with the AIUM phantom —Answer: c. Depends on beam diameter
Whose principle states: "All points on an ultrasound waveform can be considered as point
sources for the production of secondary spherical wavelets"?
a. Doppler's
b. Curie's
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Answers (100% Correct Answers)
The ability to resolve structures lying perpendicular to the axis of the ultrasound beam is called
a. Lateral resolution
b. Axial resolution
c. Depth resolution
d. Longitudinal resolution —Answer: a. Lateral resolution
Generally, ultrasound transducer have
a. Better axial resolution than lateral resolution
b. Better lateral resolution than axial resolution
c. Better azimuthal resolution than radial resolution
d. Equal axial and lateral resolution —Answer: a. Better axial resolution than lateral resolution
Which of the following are most commonly used in ultrasound transducers
a. Lead zirconate titanate (PZT)
b. Barium sulfate
c. Metaniobate
d. Quartz —Answer: a. Lead zirconate titanate (PZT)
Which of the following varies with distance from the transducer?
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,a. Lateral resolution
b. Frequency
c. Axial resolution
d. Special pulse length —Answer: a. Lateral resolution
Increasing axial resolution by increasing frequency results in
a. Increasing penetration
b. Decreasing half-intensity depth
c. Decreasing the pulse repetition frequency
d. None of the above —Answer: b. Decreasing half-intensity depth
Transducers are focused by two major methods: internal focusing and external focusing. These
methods can be accomplished by
a. Thickening the crystal and adding a water path
b. Cutting a curved transducer element and/or using an acoustic lens
c. Draping the crystal with metal ions and damping
d. Using a crystal pulse and a bandwidth limiter
e. All of the above will focus a transducer element —Answer: b. Cutting a curved transducer
element and/or using an acoustic lens
The unit applied to the Q factor (quality factor) that describes the ratio of operating frequency to
bandwidth is called
a. Megahertz (MHz)
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, b. Percent
c. Millimeters per microsecond
d. Fresnel
e. None of the above —Answer: e. none of the above
The backing material that is usually constructed in a continuous wave Doppler transducer is
a. Epoxy resin
b. Cork
c. Air
d. Tungsten powder
e. None of the above —Answer: e. None of the above
The intensity of the ultrasound beam
a. Is measured in watts
b. Is always constant
c. Depends on beam diameter
d. Is measured with the AIUM phantom —Answer: c. Depends on beam diameter
Whose principle states: "All points on an ultrasound waveform can be considered as point
sources for the production of secondary spherical wavelets"?
a. Doppler's
b. Curie's
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