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Session Type: Refresher Course Session Number: RC 413 Session Title: Artefacts and pitfalls in tomography Presentation Title: A. CT Control Number: 477 Learning Objectives: 1. To understand the source of artefacts in clinical CT. 2. To understand the most important correction methods. 3. To find out what artefact correction techniques are actually provided by the CT vendors in their systems. Abstract: Although CT is the most quantitative diagnostic tomographic imaging modality its images still suffer from several kinds of artifacts. Among the CT artifacts the most severe one is the metal artifact, mainly because larger metal implants are almost opaque to the x-ray radiation. This means that metal causes significant beam hardening and x-rays that are scattered from the surrounding tissue into the metal shadow cause a very high scatter-to-primary ratio. Altogether these metal artifacts are the most prominent and probably the most well-known CT artifacts. In addition there are many less dominating sources of artifacts. Among those are sampling issues causing aliasing artifacts, beam hardening and scatter causing dark streaks between denser objects such as bones, motion causing motion blurring and partial cycloid artifacts, very large patients caus-ing truncation artifacts, as well as the finite detector size which causes linear and non-linear partial volume artifacts. Last but not least there are artifacts that are known mainly to experts in CT physics because the manufacturers typically correct for them: defect detector pixel artifacts, detector afterglow artifacts, and geometric misalignment artifacts. The lecture discusses the source of these artifacts and gives, wherever applicable, examples and points towards approaches of how to reduce such artifacts.
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Abstract Status: Completed
Abstract Categories Status: Completed AreaOfInterestA: Radiation physics ImagingTechniqueA: CT ProcedureA: Other SpecialFocusA: Other
MRQs Status: Completed Technical Support Questions? Helpdesk European Society of Radiology Phone: +1-217-398-1792 Email:
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