Beam hardening correction for a cone-beam CT system and its effect on spatial resolution

ZHAO Wei; FU Guo-Tao; SUN Cui-Li; WANG Yan-Fang; WEI Cun-Feng; CAO Da-Quan; QUE Jie-Min; TANG Xiao; SHI Rong-Jian; WEI Long; YU Zhong-Qiang

doi:10.1088/1674-1137/35/10/018

Chinese Physics C> 2011, Vol. 35> Issue(10) : 978-985 DOI: 10.1088/1674-1137/35/10/018

Beam hardening correction for a cone-beam CT system and its effect on spatial resolution

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Abstract：
In this paper, we present a beam hardening correction (BHC) method in three-dimension space for a cone-beam computed tomography (CBCT) system in a mono-material case and investigate its effect on the spatial resolution. Due to the polychromatic character of the X-ray spectrum used, cupping and streak artifacts called beam hardening artifacts arise in the reconstructed CT images, causing reduced image quality. In addition, enhanced edges are introduced in the reconstructed CT images because of the beam hardening effect. The spatial resolution of the CBCT system is calculated from the edge response function (ERF) on different planes in space. Thus, in the CT images with beam hardening artifacts, enhanced ERFs will be extracted to calculate the modulation transfer function (MTF), obtaining a better spatial resolution that deviates from the real value. Reasonable spatial resolution can be obtained after reducing the artifacts. The 10% MTF value and the full width at half maximum (FWHM) of the point spread function with and without BHC are presented.

References

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ZHAO Wei, FU Guo-Tao, SUN Cui-Li, WANG Yan-Fang, WEI Cun-Feng, CAO Da-Quan, QUE Jie-Min, TANG Xiao, SHI Rong-Jian, WEI Long and YU Zhong-Qiang. Beam hardening correction for a cone-beam CT system and its effect on spatial resolution[J]. Chinese Physics C, 2011, 35(10): 978-985. doi: 10.1088/1674-1137/35/10/018

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Received: 2011-01-24
Revised: 2011-04-18

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沈阳化工大学材料科学与工程学院沈阳 110142

Beam hardening correction for a cone-beam CT system and its effect on spatial resolution

Received Date: 2011-01-24
Accepted Date: 2011-04-18
Available Online: 2011-10-05

Abstract: In this paper, we present a beam hardening correction (BHC) method in three-dimension space for a cone-beam computed tomography (CBCT) system in a mono-material case and investigate its effect on the spatial resolution. Due to the polychromatic character of the X-ray spectrum used, cupping and streak artifacts called beam hardening artifacts arise in the reconstructed CT images, causing reduced image quality. In addition, enhanced edges are introduced in the reconstructed CT images because of the beam hardening effect. The spatial resolution of the CBCT system is calculated from the edge response function (ERF) on different planes in space. Thus, in the CT images with beam hardening artifacts, enhanced ERFs will be extracted to calculate the modulation transfer function (MTF), obtaining a better spatial resolution that deviates from the real value. Reasonable spatial resolution can be obtained after reducing the artifacts. The 10% MTF value and the full width at half maximum (FWHM) of the point spread function with and without BHC are presented.