6 Questions
What type of artifacts are produced when the projection readings deviate consistently from the truth?
Ring artifacts
In which generation of CT scanners do ring artifacts predominantly occur?
Third-generation
How do inaccuracies from a particular detector during a scan impact the image?
They reinforce along a ring of radius d
What contributes to pixels over most of the image in the presence of detector inaccuracies?
Several back-projected values
How are ring artifacts usually recognized and removed from CT images?
By software ring-correction algorithms
Without corrective algorithms, where would detector inaccuracies be visible on most or all CT images?
Most or all CT images
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.
Test your knowledge on ring or partial ring artifacts in CT scanners, which are caused by deviations in projection readings from the truth. Learn about the factors that can contribute to these artifacts and how they are related to third-generation CT scanners.
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