An Open Source GPU Accelerated Framework for Flexible Algebraic Reconstruction at Synchrotron Light Sources

The recent developments in detector technology made possible 4D (3D + time) X-ray microtomography with high spatial and time resolutions. The resolution and duration of such exper- iments is currently limited by destructive X-ray radiation . Algebraic reconstruction technique (ART) can incorporate a priori knowledge into a reconstruction model that will allow us to apply some ap- proaches to reduce an imaging dose and keep a good enough reconstruction quality. However, these techniques are very computationally demanding. In this paper we present a framework for ART reconstruction based on OpenCL technology. Our approach treats an algebraic method as a compo- sition of interacting blocks which perform different tasks , such as projection selection, minimization, projecting and regularization. These tasks are realised us ing multiple algorithms differing in perfor- mance, the quality of reconstruction, and the area of applicability. Our framework allows to freely combine algorithms to build the reconstruction chain. All algorithms are implemented with OpenCL and are able to run on a wide range of parallel hardware. As well the framework is easily scalable to clustered environment with MPI. We will describe the architecture of ART framework and evaluate the quality and performance on latest generation of GPU hardware from NVIDIA and AMD.