基于Δμ-ρ_e的医学DECT电子密度图像的重建和数值校准

发布时间：2018-03-31 15:42

本文选题：双能CT　切入点：电子密度图像　出处：《航天医学与医学工程》2017年04期

【摘要】：目的进行双能CT电子密度图像的重建和数值校准,以获得精确的电子密度图像。方法首先基于医学双能CT(DECT)基物质分解成像的基本原理,计算得到理论上的电子密度图像,以及高、低两种不同能量水平下的、关于X射线线性衰减系数的单能图像;然后将两种不同能量水平下的X射线线性衰减系数之组合与电子密度理论值进行线性拟合(Δμ-ρ_e)并计算拟合优度;最后由最佳拟合优度实现医学DECT电子密度图像的重建和校准。结果仿真实验及定量分析结果表明,本文方法得到的电子密度重建图像像素值更加准确,图像质量更高;实际数据实验表明了本文方法的有效性。结论本文实现了一种实用、准确的医学DECT电子密度图像重建和数值校准方法。
[Abstract]:Objective to obtain accurate electron density images by reconstruction and numerical calibration of dual energy CT electron density images.Methods based on the basic principle of decomposing medical dual-energy CTECT-based materials into images, the theoretical electron density images and single-energy images of X-ray linear attenuation coefficients at high and low energy levels were obtained.Then, the combination of two X-ray linear attenuation coefficients at different energy levels and the theoretical values of electron density are fitted linearly (螖渭-蟻 E) and the goodness of fit is calculated. Finally, the reconstruction and calibration of medical DECT electron density images are realized by the best fitting preference.Results the results of simulation and quantitative analysis show that the proposed method is more accurate in pixel value and higher in image quality, and the experimental results show that the proposed method is effective.Conclusion this paper presents a practical and accurate method for reconstruction and numerical calibration of medical DECT electron density images.
【作者单位】：山东大学信息科学与工程学院;山东大学第二医院影像科;山东大学齐鲁医院心内科;
【基金】：山东省自然科学基金自助项目(ZR2014FM006) 国家自然科学基资助项目(81671703) 山东省重点研发计划资助项目(2015GS118026)
【分类号】：R814.42;TP391.41

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