Nilchian Masih, Vonesch Cédric, Modregger Peter, Stampanoni Marco, Unser Michael
Laboratoire d’Imagerie Biomédicale, École Polytechnique Fédérale de Lausanne, Switzerland.
Opt Express. 2013 Mar 11;21(5):5511-28. doi: 10.1364/OE.21.005511.
Differential phase-contrast is a recent technique in the context of X-ray imaging. In order to reduce the specimen's exposure time, we propose a new iterative algorithm that can achieve the same quality as FBP-type methods, while using substantially fewer angular views. Our approach is based on 1) a novel spline-based discretization of the forward model and 2) an iterative reconstruction algorithm using the alternating direction method of multipliers. Our experimental results on real data suggest that the method allows to reduce the number of required views by at least a factor of four.
微分相衬是X射线成像领域中的一项新技术。为了减少样本的曝光时间，我们提出了一种新的迭代算法，该算法能在使用大幅减少的角度视图的情况下，达到与FBP类方法相同的质量。我们的方法基于：1）正向模型的一种基于样条的新型离散化；2）一种使用乘子交替方向法的迭代重建算法。我们对实际数据的实验结果表明，该方法能够将所需视图数量至少减少到原来的四分之一。
