X-ray beam hardening correction for measuring density in linear acceleratorindustrial computed tomography

ZHOU Ri-Feng; WANG Jue; CHEN Wei-Min

doi:10.1088/1674-1137/33/7/018

Chinese Physics C> 2009, Vol. 33> Issue(7) : 599-602 DOI: 10.1088/1674-1137/33/7/018

X-ray beam hardening correction for measuring density in linear acceleratorindustrial computed tomography

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Abstract：
Due to X-ray attenuation being approximately proportional to material density，it is possible to measure the inner density through Industrial Computed Tomography (ICT) images accurately. In practice, however, a number of factors including the non-linear effects of beam hardening and diffuse scattered radiation complicate the quantitative measurement of density variations in materials. This paper is based on the linearization method of beam hardening correction, and uses polynomial fitting coefficient which is obtained by the curvature of iron polychromatic beam data to fit other materials. Through theoretical deduction, the paper proves that the density measure error is less than 2% if using pre-filters to make the spectrum of linear accelerator range mainly 0.3 MeV to 3 MeV. Experiment had been set up at an ICT system with a 9 MeV electron linear accelerator. The result is satisfactory. This technique makes the beam hardening correction easy and simple, and it is valuable for
measuring the ICT density and making use of the CT images to recognize
materials.

References

[1]

. van de Casteele R, van Dyck D, Sijbers J et al. Physics in Medicine and Biology, 2002, 47: 41812. Krumm M, Kasperl S, Franz M. NDT E International,2008, 41: 2423. Brooks R A, Chiro G Di. Physics in Medicine and Biology,1976, 21(3): 3904. Duerinckx A J, Macovski A. Journal of Computer Assisted Tomography, 1978, 2(4): 4815. Rao P S, Al di R J. Radiology, October, 1981, 141: 2236. Zatz L M, Alvarez R E. Radiology, 1977, 124: 917. Hammersberg P, Angard M. Journal of X-ray Science and Technology, 1998, 8(1): 758. Herman G T. Physics in Medicine and Biology, 1979, 24(1):819. Herman G T. The Fundamentals of Computerized Tomog-raphy. New York: Academic Press, 1980. 23-3010. ZENG Gang et al. HEPNP, 2006, 30:178 (in Chinese)

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ZHOU Ri-Feng, WANG Jue and CHEN Wei-Min. X-ray beam hardening correction for measuring density in linear acceleratorindustrial computed tomography[J]. Chinese Physics C, 2009, 33(7): 599-602. doi: 10.1088/1674-1137/33/7/018

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Received: 2008-07-03
Revised: 2009-03-10

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沈阳化工大学材料科学与工程学院沈阳 110142

X-ray beam hardening correction for measuring density in linear acceleratorindustrial computed tomography

Corresponding author: ZHOU Ri-Feng,

Received Date: 2008-07-03
Accepted Date: 2009-03-10
Available Online: 2009-07-05

Abstract:

Due to X-ray attenuation being approximately proportional to material density，it is possible to measure the inner density through Industrial Computed Tomography (ICT) images accurately. In practice, however, a number of factors including the non-linear effects of beam hardening and diffuse scattered radiation complicate the quantitative measurement of density variations in materials. This paper is based on the linearization method of beam hardening correction, and uses polynomial fitting coefficient which is obtained by the curvature of iron polychromatic beam data to fit other materials. Through theoretical deduction, the paper proves that the density measure error is less than 2% if using pre-filters to make the spectrum of linear accelerator range mainly 0.3 MeV to 3 MeV. Experiment had been set up at an ICT system with a 9 MeV electron linear accelerator. The result is satisfactory. This technique makes the beam hardening correction easy and simple, and it is valuable for
measuring the ICT density and making use of the CT images to recognize
materials.