论文标题
使用共识平衡的数据和图像进行图像重建的先验集成
Data and Image Prior Integration for Image Reconstruction Using Consensus Equilibrium
论文作者
论文摘要
图像域的先验模型已被证明可以提高重建图像的质量,尤其是在数据受到限制的情况下。通过隐式或明确包含数据域检验的原始数据的预处理也已分别显示了改进重建的实用性。在这项工作中,提出了一种原则性的方法,允许将数据和图像域检验的统一集成以改进图像重建。共有的平衡框架扩展了以整合物理传感器模型,数据模型和图像模型。为了实现此集成,在共识平衡中使用的常规图像变量被代表数据域数量的变量增强。总体结果产生数据和重建图像的综合估计,这些估计与物理模型和先前的模型一致。这项工作中两个域中使用的先前模型都是使用深神经网络创建的。通过合并数据和图像域允许的优质质量,用于两个应用:限量角CT和加速MRI。这两个应用程序中的先前数据模型都集中在恢复丢失的数据上。从实际检查的CT数据集和模拟数据集上的4倍加速MRI问题中,给出了90度限制角度层析成像问题的实验结果。新框架非常灵活,可以轻松地应用于其他数据不完美的计算成像问题。
Image domain prior models have been shown to improve the quality of reconstructed images, especially when data are limited. Pre-processing of raw data, through the implicit or explicit inclusion of data domain priors have separately also shown utility in improving reconstructions. In this work, a principled approach is presented allowing the unified integration of both data and image domain priors for improved image reconstruction. The consensus equilibrium framework is extended to integrate physical sensor models, data models, and image models. In order to achieve this integration, the conventional image variables used in consensus equilibrium are augmented with variables representing data domain quantities. The overall result produces combined estimates of both the data and the reconstructed image that is consistent with the physical models and prior models being utilized. The prior models used in both domains in this work are created using deep neural networks. The superior quality allowed by incorporating both data and image domain prior models is demonstrated for two applications: limited-angle CT and accelerated MRI. The prior data model in both these applications is focused on recovering missing data. Experimental results are presented for a 90 degree limited-angle tomography problem from a real checked-bagged CT dataset and a 4x accelerated MRI problem on a simulated dataset. The new framework is very flexible and can be easily applied to other computational imaging problems with imperfect data.