Understanding Ultrasound Physics – SPI
Exam Review: Artifacts Explained.
Which situation will commonly produce reverberation artifact?
A. Two masses that lie perpendicular to the sound beam's main axis
B. two weak reflectors that lie close to each other along the axis of the beam
C. two strong reflectors that lie along the main axis of the beam
D. a single highly reflective mass - Correct Answer: ✔✔C. two strong reflectors
that lie along the main axis of the beam
Reverberations are commonly produced by a pair of strong reflectors that lie
along the main axis of an ultrasound beam.
What are the characteristics of a medium that produces comet tail artifact?
A. Weak reflectors, closely spaced, low propagation speeds
B. strong reflectors, widely spaced, high propagation speeds
C. strong reflectors, closely spaced, low propagation speed
D. strong reflectors, closely spaced, high propagation speed - Correct Answer:
✔✔D. strong reflectors, closely spaced, high propagation speed
A comet tail artifact is similar to a reverberation except that the reflection is a
solid hyperechoic line.
Exams paper with Answers
,The comet tail is a solid jet because of strong reflectors with high propagation
speeds lying close to each other.
What is the most likely cause of ring down artifact?
A. Refraction
B. Inversion
C. Reabsorption
D. Reflection - Correct Answer: ✔✔D. Reflection
Ring down artifact is thought to result from multiple reflections.
Where are shadowing artifacts commonly seen on an acoustic scan?
A. Deeper than a structure with a high impedance
B. shallower than a structure with a low propagation speed
C. deeper than a structure with a high attenuation
D. Alongside of a structure with a low elastance - Correct Answer: ✔✔C. deeper
than a structure with a high attenuation
Shadowing occurs on an image at locations beneath strong attenuators. For
example, a region deeper than a gallstone may be affected by shadowing.
How is shadowing artifact expressed?
Exams paper with Answers
, A. Positioning structures too deep on the image
B. locating structures in improper lateral position
C. Placing reflections in multiple locations
D. reflectors being absent on the image - Correct Answer: ✔✔D. reflectors
being absent on the image
A shadow artifact results from unexpectedly high attenuation. The ultrasound
beam deeper than the strong attenuator is so weak that significant anatomical
information does not appear on the image.
Which of these produces shadowing?
A. Reverberation
B. Multi path
C. reflection
D. Attenuation - Correct Answer: ✔✔D. Attenuation
Shadowing results from atypical attenuation, the weakening of ultrasound
pulses.
What causes enhancement artifact?
A. Sound beams bending
B. linear array transducer architecture
C. unexpectedly low acoustic attenuation
Exams paper with Answers
Exam Review: Artifacts Explained.
Which situation will commonly produce reverberation artifact?
A. Two masses that lie perpendicular to the sound beam's main axis
B. two weak reflectors that lie close to each other along the axis of the beam
C. two strong reflectors that lie along the main axis of the beam
D. a single highly reflective mass - Correct Answer: ✔✔C. two strong reflectors
that lie along the main axis of the beam
Reverberations are commonly produced by a pair of strong reflectors that lie
along the main axis of an ultrasound beam.
What are the characteristics of a medium that produces comet tail artifact?
A. Weak reflectors, closely spaced, low propagation speeds
B. strong reflectors, widely spaced, high propagation speeds
C. strong reflectors, closely spaced, low propagation speed
D. strong reflectors, closely spaced, high propagation speed - Correct Answer:
✔✔D. strong reflectors, closely spaced, high propagation speed
A comet tail artifact is similar to a reverberation except that the reflection is a
solid hyperechoic line.
Exams paper with Answers
,The comet tail is a solid jet because of strong reflectors with high propagation
speeds lying close to each other.
What is the most likely cause of ring down artifact?
A. Refraction
B. Inversion
C. Reabsorption
D. Reflection - Correct Answer: ✔✔D. Reflection
Ring down artifact is thought to result from multiple reflections.
Where are shadowing artifacts commonly seen on an acoustic scan?
A. Deeper than a structure with a high impedance
B. shallower than a structure with a low propagation speed
C. deeper than a structure with a high attenuation
D. Alongside of a structure with a low elastance - Correct Answer: ✔✔C. deeper
than a structure with a high attenuation
Shadowing occurs on an image at locations beneath strong attenuators. For
example, a region deeper than a gallstone may be affected by shadowing.
How is shadowing artifact expressed?
Exams paper with Answers
, A. Positioning structures too deep on the image
B. locating structures in improper lateral position
C. Placing reflections in multiple locations
D. reflectors being absent on the image - Correct Answer: ✔✔D. reflectors
being absent on the image
A shadow artifact results from unexpectedly high attenuation. The ultrasound
beam deeper than the strong attenuator is so weak that significant anatomical
information does not appear on the image.
Which of these produces shadowing?
A. Reverberation
B. Multi path
C. reflection
D. Attenuation - Correct Answer: ✔✔D. Attenuation
Shadowing results from atypical attenuation, the weakening of ultrasound
pulses.
What causes enhancement artifact?
A. Sound beams bending
B. linear array transducer architecture
C. unexpectedly low acoustic attenuation
Exams paper with Answers
