A Dictionary Learning Approach for Joint Reconstruction and Denoising in Low Field Magnetic Resonance Imaging

Emmanuel Ahishakiye, Martin Bastiaan van Gijzen, Xiujie Shan, Julius Tumwiine, Johnes Obungoloch

Research output: Chapter in Book/Conference proceedings/Edited volumeConference contributionScientificpeer-review

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Currently, many children with hydrocephalus in East Africa and other resource-constrained countries do not have access to Magnetic Resonance Imaging (MRI) scanners, the preferred imaging tool during the disease administration and treatment. Conventional MRI scanners are costly to buy and manage, which limits their utilization in low-income countries. Low-field MRI scanners can offer an affordable, sustainable, and safe imaging alternative to high-field MRI. However, they are associated with a low signal-to-noise ratio (SNR), and therefore the images obtained are noisy. In this study, we propose an algorithm that may help to alleviate the drawbacks of low-field MRI by improving the quality of images obtained. The proposed algorithm combines our previous proposed algorithm known as AS-DLMRI for image reconstruction and a nonlinear diffusion filter for image denoising. The formulation is capable of removing additive zero-mean white and homogeneous Gaussian noise, as well as other noise types that could be present in the original signal. Experiments on visual quality revealed that the proposed algorithm is effective in denoising images during reconstruction. The proposed algorithm effectively denoised a noisy phantom, and a noisy MRI image, and had better performance when compared to DLMRI and AS-DLMRI in terms of Peak Signal to Noise ratio (PSNR) and High-Frequency Error Norm (HFEN). Integrating AS-DLMRI and the nonlinear diffusion filter proved to be effective in improving the quality of the images during the experiments performed. The hybrid algorithm may be of great use in imaging modalities like low-field MRI that are associated with low SNR.
Original languageEnglish
Title of host publication2021 IST-Africa Conference (IST-Africa)
Subtitle of host publicationProceedings
Place of PublicationDanvers
Number of pages10
ISBN (Electronic)978-1-905824-67-0
ISBN (Print)978-1-6654-4830-7
Publication statusPublished - 2021
Event 2021 IST-Africa Conference - Virtual conference, South Africa
Duration: 10 May 202114 May 2021


Conference 2021 IST-Africa Conference
Abbreviated titleIST-Africa 2021
Country/TerritorySouth Africa
CityVirtual conference

Bibliographical note

Green Open Access added to TU Delft Institutional Repository ‘You share, we take care!’ – Taverne project https://www.openaccess.nl/en/you-share-we-take-care
Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.


  • MRI
  • low-field MRI
  • image reconstruction
  • Dictionary learning
  • Image denoising


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