• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文会议>SPIE Medical Imaging Conference >APPLICATION OF THREE-PASS METAL ARTEFACT REDUCTION TO PHOTON-COUNTING BREAST TOMOSYNTHESIS
【24h】

APPLICATION OF THREE-PASS METAL ARTEFACT REDUCTION TO PHOTON-COUNTING BREAST TOMOSYNTHESIS

机译：三通金属伪像的还原在光子计数断层合成中的应用

获取原文
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

Digital breast tomosynthesis is a rising modality in breast cancer screening and diagnosis. As such, there is also increasing interest in employing breast tomosynthesis in diagnostic tasks like tomosynthesis-guided stereotactic breast biopsy, which includes imaging in presence of metal objects. Since reconstruction techniques in tomosynthesis operate on projection data from a limited angular range, highly attenuating metal objects create strong streak-like tomosynthesis artefacts, which are accompanied by strong undershoots at the object boundaries in the focal and adjacent slices. These artefacts can significantly hamper image quality by obscuring anatomical detail in the vicinity of the metal object. In this contribution, we therefore present an approach for reducing such metal artefacts by means of a three-pass reconstruction method. The method analyzes the reconstructed tomosynthesis volume for metal contributions. It eventually determines corresponding pixels in the projection data, and decomposes the projections accordingly into metal and non-metal projections. After each projection set is reconstructed independently, the final, enhanced tomosynthesis volume is obtained by a non-linear blending operation. The proposed approach was evaluated on a set of eight clinical cases. Each breast contained a metal clip, which is typically left as marker after biopsy. The proposed method achieved to retain the appearance of the metal object in the focal and its adjacent slices. At the same time complete removal of streak artefacts in all distant slices was achieved. Efficacy of the method in presence of larger objects was demonstrated in phantom studies, where visibility of microcalcifications was completely restored.
机译：数字化乳房断层合成是乳腺癌筛查和诊断中一种新兴的方式。这样，在诸如断层合成引导的立体定向乳房活检的诊断任务中采用乳房断层合成的兴趣也越来越高，这包括在存在金属物体的情况下进行成像。由于断层合成中的重建技术在有限的角度范围内对投影数据进行操作，因此高度衰减的金属物体会产生强烈的条纹状断层合成伪像，并伴随着焦点和相邻切片中物体边界处的强烈下冲。这些伪影会通过掩盖金属物体附近的解剖细节而严重阻碍图像质量。因此，在这一贡献中，我们提出了一种通过三遍重构方法来减少此类金属伪像的方法。该方法分析了重建的断层合成体积中的金属贡献。最终确定投影数据中的相应像素，并将投影相应地分解为金属和非金属投影。在独立地重建每个投影集之后，通过非线性混合操作获得最终的增强的层析合成体积。对一组八例临床病例评估了所提出的方法。每个乳房都包含一个金属夹，通常在活检后留作标记。所提出的方法实现了在焦点及其相邻切片中保留金属对象的外观。同时，完全消除了所有远距离切片中的条纹伪影。在幻影研究中证明了该方法在较大物体存在下的功效，其中微钙化的可见性已完全恢复。

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