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-  2017 

运用兆伏锥形束计算机断层成像校正千伏计算机断层成像中假牙的金属伪影

DOI: doi:10.7507/1001-5515.201609071

Keywords: 计算机成像, 金属伪影, 兆伏锥形束计算机断层成像, 千伏计算机断层成像, 融合, 先验图像

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Abstract:

本文提出一种运用兆伏锥形束 CT(MVCBCT)校正千伏 CT(kVCT)图像中假牙金属伪影的新方法。该方法分别用 kVCT 和 MVCBCT 扫描佩戴假牙的患者,得到两种 CT 图像。在 kVCT 中阈值分割得到金属图像,运用 MVCBCT 和 kVCT 融合得到先验图像,对先验图像前投影来替代原始金属区投影,最后通过滤波反投影(FBP)重建图像。将本文方法校正后效果与归一化金属伪影校正法(NMAR)、以 MVCBCT 为先验图像的归一化金属伪影校正法(NMAR-MV),以及线性插值法(LIMAR)这三种常用伪影校正方法进行比较,计算其归一化均方根偏差(NRMSD)和平均绝对偏差(MAD)。实验结果显示本文方法去除了严重的金属伪影且没有引入其他伪影,基于参考图像计算的 NRMSD 值和 MAD 值最小。NMAR、NMAR-MV、LIMAR 以及本文方法的 NRMSD 值分别为 21.0%、22.1%、41.9%、17.0%;MAD 值分别为 232、235、553、205 HU。本文提出的伪影校正方法能较好地去除假牙的金属伪影,大幅改善 CT 图像质量

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