Computed Tomographic Artifact Minimization
Computed tomographic artifact reduction is a method for reducing errors in CT images through mathematical correction. It corrects beam hardening and scatter errors to produce more precise reconstruction data.
Physical-Chemical Mechanism of Action
CT images are created by capturing rays that pass through the object. The density of the material influences how strongly the rays are absorbed. This results in different brightness levels in the image. However, beam hardening (change in ray intensity caused by the material) and scatter (deviation of the ray direction) can cause artifacts that impair image quality.
Metallurgical Relevance & Risks in Welding
In the workshop, CT images can be used to analyze the internal structure of steel parts. Artifacts in these images can provide incorrect information and impair the quality of the analysis. This can lead to wrong conclusions and cause important metallurgical properties to not be correctly recognized.
Workshop Practice & Instructions
To minimize artifacts in CT images, a mathematical correction algorithm is used. This takes beam hardening and scatter into account and corrects the image values accordingly. It is important that the algorithm is optimized for the specific materials and scan parameters to achieve the best possible reconstruction.