...
首页> 外文期刊>Physics in medicine and biology. >Weighted expectation maximization reconstruction algorithms with application to gated megavoltage tomography.
【24h】

Weighted expectation maximization reconstruction algorithms with application to gated megavoltage tomography.

机译:加权期望最大化重建算法在门控兆伏断层扫描中的应用。

获取原文
获取原文并翻译 | 示例
           

摘要

We propose and investigate weighted expectation maximization (EM) algorithms for image reconstruction in x-ray tomography. The development of the algorithms is motivated by the respiratory-gated megavoltage tomography problem, in which the acquired asymmetric cone-beam projections are limited in number and unevenly sampled over view angle. In these cases, images reconstructed by use of the conventional EM algorithm can contain ring- and streak-like artefacts that are attributable to a combination of data inconsistencies and truncation of the projection data. By use of computer-simulated and clinical gated fan-beam megavoltage projection data, we demonstrate that the proposed weighted EM algorithms effectively mitigate such image artefacts.
机译:我们提出并研究加权期望最大化(EM)算法,以进行X射线断层扫描中的图像重建。该算法的发展是受呼吸门控兆伏断层扫描问题的推动,在该问题中,所获取的不对称锥束投影的数量受到限制,并且在视角范围内采样不均匀。在这些情况下,通过使用常规EM算法重建的图像可能包含环状和条纹状伪影,这些伪影归因于数据不一致和投影数据截断的组合。通过使用计算机模拟和临床门控的扇形光束兆伏投影数据,我们证明了所提出的加权EM算法有效缓解了此类图像伪像。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱:kefu@zhangqiaokeyan.com

京公网安备:11010802029741号 ICP备案号:京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有
  • 客服微信

  • 服务号