Digital Tomosynthesis System Geometry Analysis Using Convolution-Based Blur-and-Add (BAA) Model.
Digital Tomosynthesis System Geometry Analysis Using Convolution-Based Blur-and-Add (BAA) Model.
复制标题
使用基于卷积的模糊相加 (BAA) 模型进行数字断层合成系统几何分析。
DOI：
10.1109/tmi.2015.2458983
复制
发表时间：
2016
影响因子：
10.6
通讯作者：
Fahrig,Rebecca
中科院分区：
文献类型：
--
作者：
Wu,Meng;Yoon,Sungwon;Solomon,EdwardG;Star-Lack,Josh;Pelc,Norbert;Fahrig,Rebecca
数字断层合成是一种辐射剂量低于计算机断层扫描（CT）的三维成像技术。由于断层合成系统中的缺失数据，重建算法不能完全去除深度方向上的平面外结构。在这项工作中，我们分析了常见的断层合成系统的脉冲响应上的平面到平面的基础上，并提出了一种快速，准确的基于卷积的模糊和添加（BAA）模型来模拟反投影图像。此外，分析形式主义描述的脉冲响应的平面外的结构，可以推广到旋转和平行龙门架。我们实现了一个射线跟踪的正投影和反投影（基于射线的模型）算法和卷积的BAA模型来模拟移位和添加（反投影）断层合成重建。具有适当几何失真校正的基于卷积的BAA模型提供了对断层合成重建的合理准确的估计。数值比较表明，使用这两种模型的模拟图像的均方根误差相差不到6%。这种基于卷积的BAA模型可用于有效的系统几何分析、重建算法设计、平面外伪影抑制和CT断层合成配准。
Digital tomosynthesis is a three-dimensional imaging technique with a lower radiation dose than computed tomography (CT). Due to the missing data in tomosynthesis systems, out-of-plane structures in the depth direction cannot be completely removed by the reconstruction algorithms. In this work, we analyzed the impulse responses of common tomosynthesis systems on a plane-to-plane basis and proposed a fast and accurate convolution-based blur-and-add (BAA) model to simulate the backprojected images. In addition, the analysis formalism describing the impulse response of out-of-plane structures can be generalized to both rotating and parallel gantries. We implemented a ray tracing forward projection and backprojection (ray-based model) algorithm and the convolution-based BAA model to simulate the shift-and-add (backproject) tomosynthesis reconstructions. The convolution-based BAA model with proper geometry distortion correction provides reasonably accurate estimates of the tomosynthesis reconstruction. A numerical comparison indicates that the simulated images using the two models differ by less than 6% in terms of the root-mean-squared error. This convolution-based BAA model can be used in efficient system geometry analysis, reconstruction algorithm design, out-of-plane artifacts suppression, and CT-tomosynthesis registration.