摘要
针对基于平板探测器的锥束CT系统固然存在的散射伪影,提出在X射线源和被检测物体之间添加一个射束衰减网格装置的散射校正方法。本文首先介绍了射束衰减网格的实验装置,然后推导了基于射束衰减网格的锥束CT散射校正方法,最后通过圆柱样品实验验证了算法的可行性。实验结果表明,研究提出的散射校正方法能有效减少基于平板探测器的锥束CT系统散射伪影,提高了重建切片图像的质量。
Aiming to the scatter artifacts for the flat-panel detector-based cone beam CT, a scatter correction method which need adding a Beam Attenuation Grid between the X-Ray source and the tested object was proposed. This study firstly described the device of the Beam Attenuation Grid, then educed the scatter correction algorithm based on the Beam Attenuation Grid. In order to improve the feasibility of this method, the cylinder phantom was experimented. The result showed that the method can effectively reduce the scatter artifacts and increase the quality of the reconstructed slice image.
出处
《CT理论与应用研究（中英文）》
2009年第1期16-22,共7页
Computerized Tomography Theory and Applications
基金
航空科学基金资助项目(2006ZD53047)
关键词
锥束CT
散射校正
康普顿散射
射束衰减网格
cone beam CT
scatter correction
Compton scatter
beam attenuation grid
