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CT Scanning Artifacts

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Questions and Answers

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?

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?

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?

Scatter radiation Signup and view all the answers

What characterizes beam-hardening artifacts with respect to CT numbers in a uniform phantom?

The non-uniformities are generally small (< 5 HU) Signup and view all the answers

Which artifact type may cause shading effects that make CT numbers lower than expected?

Beam-hardening effects Signup and view all the answers

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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Description

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.