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An energy-based beam hardening model in tomography
E Van de Casteele1, D Van Dyck, J Sijbers
1Vision Lab, Physics Departement, University of Antwerp (RUCA), Belgium. elke.vandecasteele@ua.ac.be
Physics in Medicine and Biology
|December 28, 2002
Summary
Beam hardening in micro-computer tomography (microCT) causes image artifacts. This study presents a bimodal energy model to reduce these nonlinear beam hardening effects, improving image quality in medical CT and microCT applications.
Area of Science:
- Medical Imaging
- Physics
- Materials Science
Background:
- Polychromatic X-ray sources in micro-computer tomography (microCT) and medical CT lead to nonlinear attenuation.
- This nonlinear beam hardening effect causes cupping artifacts in reconstructed images if uncorrected.
Purpose of the Study:
- To present a bimodal energy model for the detected energy spectrum.
- To reduce artifacts caused by beam hardening under specific conditions.
Main Methods:
- A bimodal energy model is proposed, assuming two dominant energies describe the system.
- The model is based on the X-ray source spectrum and detector efficiency.
- Model validity was tested by fitting to experimental data from a microtomograph.
Main Results:
- The bimodal energy model demonstrates potential for reducing beam hardening artifacts.
- Experimental validation confirmed the model's applicability across different materials and source voltages.
Conclusions:
- The proposed bimodal energy model offers a viable method for mitigating beam hardening artifacts in microCT and medical CT.
- Accurate image reconstruction is achievable by compensating for nonlinear attenuation effects.