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Questions and Answers
What type of artifacts are produced when the projection readings deviate consistently from the truth?
What type of artifacts are produced when the projection readings deviate consistently from the truth?
- Beam-hardening artifacts
- Noise artifacts
- Ring artifacts (correct)
- Streak artifacts
In which generation of CT scanners do ring artifacts predominantly occur?
In which generation of CT scanners do ring artifacts predominantly occur?
- First-generation
- Fourth-generation
- Third-generation (correct)
- Second-generation
How do inaccuracies from a particular detector during a scan impact the image?
How do inaccuracies from a particular detector during a scan impact the image?
- They reinforce along a ring of radius d (correct)
- They create beam-hardening artifacts
- They form streaks in the image
- They cause noise in the image
What contributes to pixels over most of the image in the presence of detector inaccuracies?
What contributes to pixels over most of the image in the presence of detector inaccuracies?
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How are ring artifacts usually recognized and removed from CT images?
How are ring artifacts usually recognized and removed from CT images?
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Without corrective algorithms, where would detector inaccuracies be visible on most or all CT images?
Without corrective algorithms, where would detector inaccuracies be visible on most or all CT images?
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Study Notes
Artifacts in CT Scanners
- When projection readings deviate consistently from the truth, streak artifacts are produced.
- Ring artifacts predominantly occur in the third generation of CT scanners.
- Inaccuracies from a particular detector during a scan impact the image by causing pixels to have incorrect values over most of the image.
- Detector inaccuracies contribute to pixels having incorrect values over most of the image.
- Ring artifacts are usually recognized and removed from CT images using algorithms that detect and correct for inconsistencies.
- Without corrective algorithms, detector inaccuracies would be visible on most or all CT images, typically appearing as ring-shaped artifacts.
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