Scalable FBP decomposition for cone-beam CT reconstruction
Scalable FBP decomposition for cone-beam CT reconstruction
复制标题
用于锥束 CT 重建的可扩展 FBP 分解
DOI:
10.1145/3458817.3476139
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发表时间:
2021
期刊:
影响因子:
--
通讯作者:
Chen P
中科院分区:
文献类型:
--
作者:
Chen P
Filtered Back-Projection (FBP) is a fundamental compute intense algorithm used in tomographic image reconstruction. Cone-Beam Computed Tomography (CBCT) devices use a cone-shaped X-ray beam, in comparison to the parallel beam used in older CT generations. Distributed image reconstruction of cone-beam datasets typically relies on dividing batches of images into different nodes. This simple input decomposition, however, introduces limits on input/output sizes and scalability.We propose a novel decomposition scheme and reconstruction algorithm for distributed FPB. 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. Finally, we implement the proposed decomposition scheme in a framework that is useful for all current-generation CT devices (7thgen). In our experiments using up to 1024 GPUs, our framework can construct 40963volumes, for real-world datasets, in under 16 seconds (including I/O).