Sense and non-sense of beam hardening correction in CT metrology
نویسندگان
چکیده
منابع مشابه
Automatic Beam Hardening Correction For CT Reconstruction
In computed tomography (CT) the quality of reconstructed images depends on several reasons: the quality of the set-up calibration; precision of the mathematical model, used in the reconstruction procedure; the reconstruction technique used; quality of the numerical implementation of the reconstruction algorithm. Most of fast reconstruction algorithms use the X-ray monochromaticity assumption. I...
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...
متن کاملExpert-guided CT beam hardening correction for heterogeneous natural materials
We present a new method for correcting beam hardening artifacts in CT data. Software correction typically consists of a polynomial transform of the raw data, but determining optimal coefficients is not straightforward, especially if the material is not well known or characterized, as is the usual case when imaging geological materials. Our method lets an expert user guide an iterative optimizat...
متن کاملTowards Beam Hardening Correction for Polychromatic X-ray Ct
High-attenuation object-induced streaking and shadow artifacts in computerized tomography (CT) are somewhat connected to the misfit of the X-ray projection data to the range space of the Radon transform. This misfit is mainly due to the beam hardening factor of the projection data which is unavoidable for polychromatic sources. The major difficulty in dealing with the beam hardening-induced str...
متن کاملBeam hardening correction and its influence on the measurement accuracy and repeatability for CT dimensional metrology applications
The beam hardening effect is one of the major artifacts of X-ray computed tomography. It not only complicates medical inspection and material analysis, but also influences the accuracy and repeatability of dimensional measurements. Therefore, many efforts have been devoted to develop beam hardening correction methods since the early 1970s. In practice, the combination of hardware filters (pre-f...
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ژورنال
عنوان ژورنال: CIRP Annals
سال: 2012
ISSN: 0007-8506
DOI: 10.1016/j.cirp.2012.03.013