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Development of high-accuracy, high-performance projectors, using GPU technology and pipelined implementations

Research on high-performance materials for energy conversion and storage at Forschungszentrum Jülich (FZJ) has led to a demand for high-resolution, high-quality volumetric images of medium-sized coponents for flaw detection. In a joint effort of FZJ-institutes of ZEA-1, ZEA-2 and IEK-2, a competence group for computed tomography was established and has put into service a state-of-the-art CT system. In the scope of this project iterative reconstruction methods are being developed and optimized for image quality and data-throughput. Compared to analytical methods like FDK, iterative reconstruction methods offer a largely improved image quality that comes at an increased computational cost. Although this cost is somewhat mitigated through the use of highly parallel computation platforms, it is still highly challenging to maximize the image quality while using available resources efficiently. State-of-the-art iterative reconstruction techniques like OSEM rely on a forward model of the image acquisition, also known as a projection method or projector. The forward (and back) projection is by far the most computational intensive part and thus the bottleneck of iterative algorithms.

PhD ModelCopyright: Forschungszentrum Jülich GmbH

Mr. von Götz focuses on developing high-accuracy, high-performance projectors, using GPU technology and pipelined implementations. The objective of his work is to evaluate their impact on the achievable image quality for a wide range of non-destructive testing applications, taking into account the entire signal chain. For this purpose a model-based approach is used that consists of generating numerical phantoms, simulating the imaging process, reconstructing the image and comparing it to the original phantom. The image quality is assessed by a set of metrics and the consultation of expert viewers. By putting it into relation with the computational cost, an assumption on the usefulness of a reconstruction method for a specific application can be made.

Micro 3D CTCopyright: Forschungszentrum Jülich GmbH