Analytic Calculation of CT Phantom Projections and Its Application in Beam Hardening Correction

汤少杰; 牟轩沁; 闫浩; 杨莹

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Analytic Calculation of CT Phantom Projections and Its Application in Beam Hardening Correction

更新时间：2025-12-08

- Analytic Calculation of CT Phantom Projections and Its Application in Beam Hardening Correction
- Vol. 42, Issue 6, Pages: 664-668(2008)
- 作者机构：
  
  西安交通大学图像处理与模式识别研究所,西安,710049
- 作者简介：
- 基金信息：
- DOI：
  CLC： TP391.4
- Online First：09 June 2008，
  
  Published：2008
- 稿件说明：
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汤少杰, 牟轩沁, 闫浩, et al. Analytic Calculation of CT Phantom Projections and Its Application in Beam Hardening Correction[J]. 2008, 42(6): 664-668.
DOI：

汤少杰, 牟轩沁, 闫浩, et al. Analytic Calculation of CT Phantom Projections and Its Application in Beam Hardening Correction[J]. 2008, 42(6): 664-668. DOI：

摘要

为了开发出有效的医学诊断X射线CT(计算机断层扫描)射束硬化校正方法

结合X射线源能谱分布以及数学CT模体内各区域的几何形状和材料成分

提出一种宽能谱X射线投影解析计算方法.首先在仅考虑人体组织的前提下将CT值映射为材料成分

然后采用解析方法确定区域边界

最后根据X射线能谱分布计算投影数据.与线积分投影比较

该方法不但能够生成更真实的投影

而且能够为射束硬化校正与CT重建研究提供统一的投影数据.FORBILD头部模体实验结果表明

骨校正的骨区域CT值不一致误差比水校正的小4～5 Hu

比单能谱重建的大5～6 Hu.

Abstract

To develop an efficient beam hardening correction for medical diagnostic X-ray CT(computed tomography)

an analytic calculation method was proposed to simulate polychromatic X-ray projections. The method combines the energy spectrum distribution of X-ray source

geometrical shapes and material compositions of sub-regions of phantoms. Firstly

CT values are mapped into material compositions under the precondition that only human being tissues are considered. And then

boundaries of sub-regions are determined by the proposed analytic method. Finally

projections are calculated according to the energy spectrum distribution of X-ray source. Compared with the linear integral projecting

the proposed method can not only generate more realistic projections

but also provide a unified projection data for beam hardening correction and CT reconstruction. Experiments of FORBILD head phantom show that the CT-value inconsistency error of bone correction in bone region is lower than the water correction around 4-5Hu

but higher than the monochromatic reconstruction around 5-6Hu.

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references

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