DNN-based NMR Artifact Correction Method
| dc.contributor.advisor | Browder, Thomas TB | |
| dc.contributor.author | Nam, Sejin | |
| dc.contributor.department | Physics | |
| dc.date.accessioned | 2025-02-20T22:37:09Z | |
| dc.date.available | 2025-02-20T22:37:09Z | |
| dc.date.issued | 2024 | |
| dc.description.degree | Ph.D. | |
| dc.identifier.uri | https://hdl.handle.net/10125/110245 | |
| dc.subject | Physics | |
| dc.subject | Computational Physics | |
| dc.subject | Deep Learning | |
| dc.subject | NMR | |
| dc.title | DNN-based NMR Artifact Correction Method | |
| dc.type | Thesis | |
| dcterms.abstract | Nuclear Magnetic Resonance (NMR) spectroscopy, a pivotal analytical technique in physics, chemistry, biology, and medicine, is frequently challenged by spectral distortions arising from various artifacts. These distortions can significantly hinder the accurate interpretation of NMR data, necessitating advanced correction methods. Thus, there have been many analytical methods to correct NMR artifacts, such as baseline distortion correction. This work introduces a deep learning-based approach for correcting NMR artifacts with bidirectional recurrent neural networks (BRNN) and convolutional neural networks (CNN). By simulating different types of datasets and applying these neural network architectures, this work demonstrates remarkable success in mitigating persistent NMR artifacts, mainly baseline and phase shift distortions. The proposed model was evaluated by calculating the accuracy of peak integration on real-world NMR spectra corrected by both the model and the conventional methods. The symmetricity of peaks from artifact-corrected spectra on actual NMR samples was calculated. Then, symmetricity was used to numerically assess the peak amplitude values for both distorted and symmetric peaks and calculate the accuracy of both correction methods. Compared to traditional analytical methods, the proposed deep learning approach offers alternative ways to deal with NMR artifacts. Since the DNN approach is an automated NMR artifact correction, by applying consistent algorithms to identify and address artifacts, automated methods eliminate the potential for human bias. For a new type of NMR samples where the nature of baseline and phase shift distortion artifacts are different from previously known artifacts, researchers can focus on generating large sets of such data instead of developing computational methods to correct the artifacts. In order to facilitate such an approach, the model architecture is tested for memory efficiency for GPUs that are easily obtainable at the time of this writing, which allows training on GPUs with limited VRAM, unlike other DNN models designed for tasks of a similar nature. | |
| dcterms.extent | 186 pages | |
| dcterms.language | en | |
| dcterms.publisher | University of Hawai'i at Manoa | |
| dcterms.rights | All UHM dissertations and theses are protected by copyright. They may be viewed from this source for any purpose, but reproduction or distribution in any format is prohibited without written permission from the copyright owner. | |
| dcterms.type | Text | |
| local.identifier.alturi | http://dissertations.umi.com/hawii:12432 |
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