6 Questions
What is the most common type of shading artifact in CT images?
Beam-hardening effects
How do beam-hardening artifacts appear in CT numbers of a uniform material?
CT numbers are lower at the center than at the periphery
In what situation can regions of hypointensity appear downstream in CT images?
When the scan goes through thick bone regions with contrast medium
What is a common cause of shading artifacts other than beam-hardening effects?
Scatter radiation
What characterizes beam-hardening artifacts with respect to CT numbers in a uniform phantom?
The non-uniformities are generally small (< 5 HU)
Which artifact type may cause shading effects that make CT numbers lower than expected?
Beam-hardening effects
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.
Learn about common shading artifacts in CT imaging, such as beam hardening, partial volume averaging, and scatter radiation. Understand how these artifacts affect image quality and interpretation.
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