| 研究課題/領域番号 |
21K17750
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| 研究機関 | 国立研究開発法人産業技術総合研究所 |
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研究代表者 |
陳 鵬 国立研究開発法人産業技術総合研究所, 情報・人間工学領域, 研究員 (30890199)
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| 研究期間 (年度) |
2021-04-01 – 2025-03-31
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| キーワード | Computed Tomography / Image Reconstruction / Filtered Back-projection / CPU / GPU |
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| 研究実績の概要 |
We propose a novel decomposition scheme and reconstruction algorithm for distributed FPB algorithm. This scheme enables arbitrarily large input/output sizes, eliminates the redundancy arising in the end-to-end pipeline, and improves the scalability by replacing two communication collectives with only one segmented reduction. We implement the proposed decomposition scheme for input and output problems in a framework that is useful for all current-generation CT devices (7th gen). In our experiments using up to 1024 GPUs, our framework can construct 4096x4096x4096 volumes, for real-world datasets, in under 16 seconds.
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| 現在までの達成度 (区分) |
現在までの達成度 (区分)
1: 当初の計画以上に進展している
理由
The back-projection operation is a fundamental computing kernel for image reconstructions, e.g. Filtered Back-projection (FBP). We propose a collection of novel back-projection algorithms that reduce the arithmetic computation, robustly enable vectorization, enforce a regular memory access pattern, and maximize the data locality. We also implement the novel algorithms as efficient back-projection kernels that are performance portable over a wide range of CPUs.
We propose a novel decomposition scheme and reconstruction algorithm for distributed FPB algorithm. This scheme enables arbitrarily large input/output sizes, eliminates the redundancy arising in the end-to-end pipeline and improves the scalability by replacing two communication collectives with only one segmented reduction.
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| 今後の研究の推進方策 |
We plan to optimize the computing kernels using heterogeneous computing architectures for achieving computing efficiency and power efficiency, e.g., research on the FPGA accelerator. Also, we intend to extend our framework for iterative image reconstruction algorithms.
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| 次年度使用額が生じた理由 |
- Personal: The research personnel will be hired to carry out the research plan. The roles would include solving research problems as well as engineering and development.
- Travel and publications: The travel and publications costs are crucial for disseminating the work in this project. The costs would cover the attendance of conferences and workshops, inside and outside Japan to receive feedback at the early stages and publicize the research findings at the later stages.
- Equipment: Research participants will use personal PCs for conducting basic research workflow.
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