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Questions and Answers
What is the most common type of shading artifact in CT images?
What is the most common type of shading artifact in CT images?
- Partial volume averaging effects
- Beam-hardening effects (correct)
- Off-focal radiation effects
- Scatter radiation effects
How do beam-hardening artifacts appear in CT numbers of a uniform material?
How do beam-hardening artifacts appear in CT numbers of a uniform material?
- CT numbers fluctuate randomly within the material
- CT numbers are lower at the center than at the periphery (correct)
- CT numbers are higher at the center than at the periphery
- CT numbers remain uniform throughout the material
In what situation can regions of hypointensity appear downstream in CT images?
In what situation can regions of hypointensity appear downstream in CT images?
- When adjusting the brightness and contrast settings
- When the scan goes through thick bone regions with contrast medium (correct)
- When the scan passes through air pockets
- When using a very narrow window
What is a common cause of shading artifacts other than beam-hardening effects?
What is a common cause of shading artifacts other than beam-hardening effects?
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What characterizes beam-hardening artifacts with respect to CT numbers in a uniform phantom?
What characterizes beam-hardening artifacts with respect to CT numbers in a uniform phantom?
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Which artifact type may cause shading effects that make CT numbers lower than expected?
Which artifact type may cause shading effects that make CT numbers lower than expected?
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Study Notes
Artifacts in CT Images
- The most common type of shading artifact in CT images is beam-hardening artifacts.
- Beam-hardening artifacts appear as increased CT numbers in a uniform material.
- Regions of hypointensity can appear downstream in CT images when there is a dense object, such as bone or a metal implant, in the beam path.
- A common cause of shading artifacts other than beam-hardening effects is scattering of the X-ray beam.
- Beam-hardening artifacts are characterized by increased CT numbers in a uniform phantom.
- Beam-hardening is an artifact type that may cause shading effects, resulting in CT numbers that are lower than expected.
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