| 汤乐民,李敏,董建成.计算机X线摄影图像分辨率的约束最小二乘方复原研究[J].中国医学影像技术,2006,22(9):1424~1427 |
| 计算机X线摄影图像分辨率的约束最小二乘方复原研究 |
| Study of constrained least-squares restoring for improvement of resolution of computed radiographic images |
| 投稿时间：2006-05-02 修订日期：2006-08-15 |
| DOI： |
| 中文关键词: 计算机X线摄影 点扩展函数 约束最小二乘方 图像复原 |
| 英文关键词:Computed radiography Point spread function Constrained least-squares Image restoration |
| 基金项目:江苏省社会发展科技计划基金项目(BS2002020)。 |
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| 中文摘要: |
| 目的 研究约束最小二乘方滤波对计算机X线摄影(computed radiography, CR)退化图像的复原效果。方法 分析CR图像退化的原因。采用X线源强度分布高斯模型和系统冲击响应高斯函数,估算成像系统点扩散函数(point spread function, PSF);应用约束最小二乘方滤波实现CR胸片退化图像复原,并利用改进信噪比(improved SNR)指标评价图像复原效果。结果 将约束最小二乘方滤波应用于CR退化图像,在降低噪声影响的同时,图像质量得到了明显改善。结论 X线量子噪声和成像板(imaging plate, IP)结构噪声对CR图像的分辨率有很大的影响,可利用约束最小二乘方滤波复原CR退化图像。 |
| 英文摘要: |
| Objective To investigate the restoring effect of degraded computed radiographic (CR) image with constrained least-squares filtration. Methods The main reasons which resulted in the CR image degradation was analyzed in this study. The point spread function (PSF) of the imaging system was estimated by using Gaussian disposition-function of X-ray intensity and the system impulse response. Restoration was implemented for the degraded images with the PSF using constrained least-squares filtration, and the restoring effect was evaluated by index of the improved signal-to-noise ratio (ISNR). Results By means of constrained least-squares restoring, the noise influence to the degraded CR chest image was reduced, and a significant improvement of the image quality was achieved. Conclusion The quantum noises of X-ray and structure noises of IP can significantly influence the resolution of a CR image, it can be restored with constrain least-square filtration. |
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