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

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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
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 shu
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Received: 2011-01-24
Revised: 2011-04-18
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Beam hardening correction for a cone-beam CT system and its effect on spatial resolution

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.

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