Multi GPU parallelization of maximum likelihood expectation maximization method for digital rock tomography data
Abstract Digital rock is an emerging area of rock physics, which involves scanning reservoir rocks using X-ray micro computed tomography (XCT) scanners and using it for various petrophysical computations and evaluations. The acquired micro CT projections are used to reconstruct the X-ray attenuation...
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Nature Portfolio
2021
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oai:doaj.org-article:7417ad5d2f314d25b0aad43928905f392021-12-02T18:02:06ZMulti GPU parallelization of maximum likelihood expectation maximization method for digital rock tomography data10.1038/s41598-021-97833-z2045-2322https://doaj.org/article/7417ad5d2f314d25b0aad43928905f392021-09-01T00:00:00Zhttps://doi.org/10.1038/s41598-021-97833-zhttps://doaj.org/toc/2045-2322Abstract Digital rock is an emerging area of rock physics, which involves scanning reservoir rocks using X-ray micro computed tomography (XCT) scanners and using it for various petrophysical computations and evaluations. The acquired micro CT projections are used to reconstruct the X-ray attenuation maps of the rock. The image reconstruction problem can be solved by utilization of analytical (such as Feldkamp–Davis–Kress (FDK) algorithm) or iterative methods. Analytical schemes are typically computationally more efficient and hence preferred for large datasets such as digital rocks. Iterative schemes like maximum likelihood expectation maximization (MLEM) are known to generate accurate image representation over analytical scheme in limited data (and/or noisy) situations, however iterative schemes are computationally expensive. In this work, we have parallelized the forward and inverse operators used in the MLEM algorithm on multiple graphics processing units (multi-GPU) platforms. The multi-GPU implementation involves dividing the rock volumes and detector geometry into smaller modules (along with overlap regions). Each of the module was passed onto different GPU to enable computation of forward and inverse operations. We observed an acceleration of $$\sim 30$$ ∼ 30 times using our multi-GPU approach compared to the multi-core CPU implementation. Further multi-GPU based MLEM obtained superior reconstruction compared to traditional FDK algorithm.Jaya PrakashUmang AgarwalPhaneendra K. YalavarthyNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 11, Iss 1, Pp 1-9 (2021) |
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Medicine R Science Q Jaya Prakash Umang Agarwal Phaneendra K. Yalavarthy Multi GPU parallelization of maximum likelihood expectation maximization method for digital rock tomography data |
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Abstract Digital rock is an emerging area of rock physics, which involves scanning reservoir rocks using X-ray micro computed tomography (XCT) scanners and using it for various petrophysical computations and evaluations. The acquired micro CT projections are used to reconstruct the X-ray attenuation maps of the rock. The image reconstruction problem can be solved by utilization of analytical (such as Feldkamp–Davis–Kress (FDK) algorithm) or iterative methods. Analytical schemes are typically computationally more efficient and hence preferred for large datasets such as digital rocks. Iterative schemes like maximum likelihood expectation maximization (MLEM) are known to generate accurate image representation over analytical scheme in limited data (and/or noisy) situations, however iterative schemes are computationally expensive. In this work, we have parallelized the forward and inverse operators used in the MLEM algorithm on multiple graphics processing units (multi-GPU) platforms. The multi-GPU implementation involves dividing the rock volumes and detector geometry into smaller modules (along with overlap regions). Each of the module was passed onto different GPU to enable computation of forward and inverse operations. We observed an acceleration of $$\sim 30$$ ∼ 30 times using our multi-GPU approach compared to the multi-core CPU implementation. Further multi-GPU based MLEM obtained superior reconstruction compared to traditional FDK algorithm. |
| format |
article |
| author |
Jaya Prakash Umang Agarwal Phaneendra K. Yalavarthy |
| author_facet |
Jaya Prakash Umang Agarwal Phaneendra K. Yalavarthy |
| author_sort |
Jaya Prakash |
| title |
Multi GPU parallelization of maximum likelihood expectation maximization method for digital rock tomography data |
| title_short |
Multi GPU parallelization of maximum likelihood expectation maximization method for digital rock tomography data |
| title_full |
Multi GPU parallelization of maximum likelihood expectation maximization method for digital rock tomography data |
| title_fullStr |
Multi GPU parallelization of maximum likelihood expectation maximization method for digital rock tomography data |
| title_full_unstemmed |
Multi GPU parallelization of maximum likelihood expectation maximization method for digital rock tomography data |
| title_sort |
multi gpu parallelization of maximum likelihood expectation maximization method for digital rock tomography data |
| publisher |
Nature Portfolio |
| publishDate |
2021 |
| url |
https://doaj.org/article/7417ad5d2f314d25b0aad43928905f39 |
| work_keys_str_mv |
AT jayaprakash multigpuparallelizationofmaximumlikelihoodexpectationmaximizationmethodfordigitalrocktomographydata AT umangagarwal multigpuparallelizationofmaximumlikelihoodexpectationmaximizationmethodfordigitalrocktomographydata AT phaneendrakyalavarthy multigpuparallelizationofmaximumlikelihoodexpectationmaximizationmethodfordigitalrocktomographydata |
| _version_ |
1718378933525676032 |