Iterative Beam Hardening Correction for Multi-Material Objects
نویسندگان
چکیده
منابع مشابه
Iterative Beam Hardening Correction for Multi-Material Objects
In this paper, we propose an iterative beam hardening correction method that is applicable for the case with multiple materials. By assuming that the materials composing scanned object are known and that they are distinguishable by their linear attenuation coefficients at some given energy, the beam hardening correction problem is converted into a nonlinear system problem, which is then solved ...
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In industrial X-ray CT application, it is particularly important to remove beam hardening artifacts in reconstructed images in order to achieve accurate surface extraction for dimensional inspection of mechanical parts. This paper proposes a new method in the same category as the IAR (iterative artifact reduction) technique with the added advantage of not requiring repeated image reconstruction...
متن کاملMulti-Material Beam Hardening Correction(MMBHC) in Computed Tomography
In computed tomography (CT), the nonlinear attenuation characteristics of polychromatic X-rays cause beam hardening artifacts in the reconstructed images. State-of-theart methods to correct the beam hardening effect are mostly single material precorrections (e.g. water-precorrection), which are far less efficient when more than one material is present in the field of measurement. The use of tho...
متن کاملReferenceless Beam Hardening Correction in 3D Computed Tomography Images of Multi-Material Objects
We propose a new method to reduce the effects of non-linearities such as beam hardening in Computed Tomography (CT) images. Due to the polychromatic characteristics of X-ray sources the ratio of attenuated and incoming intensity is not exactly exponential with the material thickness. Within CT images this leads to artifacts like cupping, streaks and blurring. Especially in multi-material object...
متن کاملIterative correction of beam hardening artifacts in CT.
PURPOSE To reduce beam hardening artifacts in CT in case of an unknown x-ray spectrum and unknown material properties. METHODS The authors assume that the object can be segmented into a few materials with different attenuation coefficients, and parameterize the spectrum using a small number of energy bins. The corresponding unknown spectrum parameters and material attenuation values are estim...
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ژورنال
عنوان ژورنال: PLOS ONE
سال: 2015
ISSN: 1932-6203
DOI: 10.1371/journal.pone.0144607