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首页> 外文期刊>Journal of computer assisted tomography >Artifact reduction methods for truncated projections in iterative breast tomosynthesis reconstruction.
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Artifact reduction methods for truncated projections in iterative breast tomosynthesis reconstruction.

机译：伪影减少方法，用于迭代式乳房断层合成重建中的截断投影。

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摘要

Digital breast tomosynthesis (DBT) mammography is a promising imaging technique that has the potential to improve detection of early-stage breast cancers. Digital breast tomosynthesis mammography can provide quasi 3-dimensional information by reconstructing the breast volume from a number of low-dose mammograms acquired over a limited angular range. Previous studies have shown that iterative reconstruction methods such as simultaneous algebraic reconstruction technique (SART) can give satisfactory image quality in DBT. However, because of the finite size of the detector and the limited field of view, DBT reconstruction contains artifacts caused by the truncated projection-view images. We developed methods that use a local intensity equalization strategy and a geometrical tissue-compensation method to remove two types of truncation artifacts: detector boundary discontinuity and underestimation of the attenuation path length. A custom-built breast phantom and a selected DBT case were used to evaluate the improvements. A GE (GE Global Research, Niskayuna, NY, USA) prototype DBT system was used to acquire 21 projection views in 3-degree increments over a +/-30-degree angular range. Experimental results demonstrated that the artifact reduction methods can improve the image quality at the boundaries with enhanced contrast-to-noise ratio and increased background uniformity, recover the obscured breast structural information, and achieve an overall reconstruction quality comparable with the quality of those without truncation.
机译：数字乳腺断层摄影（DBT）乳腺摄影是一种很有前途的成像技术，具有改善早期乳腺癌检测的潜力。通过根据在有限角度范围内采集的许多低剂量乳房X线照片重建乳房体积，数字乳房断层合成乳房X线照片可以提供准3维信息。先前的研究表明，迭代重建方法（例如同时代数重建技术（SART））可以在DBT中提供令人满意的图像质量。但是，由于检测器的大小有限且视野有限，DBT重建包含由截断的投影视图图像引起的伪像。我们开发了使用局部强度均衡策略和几何组织补偿方法来消除两种截断伪像的方法：检测器边界不连续和衰减路径长度的低估。使用定制的乳房幻像和选定的DBT案例评估了改进。 GE（美国纽约州尼斯卡尤纳市的GE全球研究公司）原型DBT系统用于在+/- 30度角范围内以3度增量获取21个投影视图。实验结果表明，减少伪影的方法可以提高边界处的图像质量，同时提高对比度和噪声比并提高背景均匀性，恢复模糊的乳房结构信息，并获得与无截断的图像质量相当的整体重建图像质量。

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