Marshall, H., Ajraoui, S., Deppe, M.H. et al. (2 more authors) (2012) K-space filter deconvolution and flip angle self-calibration in 2D radial hyperpolarised 3He lung MRI. NMR in Biomedicine, 25 (2). pp. 389-399. ISSN 0952-3480
Abstract
In hyperpolarised 3 He lung MRI with constant flip angles, the transverse magnetisation decays with each RF excitation imposing a k-space filter on the acquired data. For radial data acquired in an angularly-sequential order, this filter causes streaking, angular shading and loss of spatial resolution in the images. The main aim of this work was to reduce the effects of the RF depletion k-space filter in radial acquisitions. Two approaches are presented; (i) retrospective deconvolution of the k-space filter for sequentially-acquired data and (ii) golden angle acquisition order. Radial trajectories sample the centre of k-space with every projection, thereby self-tracking signal decay. The inverse of the signal decay function was used to retrospectively deconvolve RF depolarisation k-space filter effects and the method was demonstrated in 2D radial imaging in phantoms and human lungs. A golden angle radial acquisition was shown to effectively suppress artefacts caused by the RF depletion k-space filter. In addition, the average flip angle per slice was calculated from the signal decay and the values were found to correspond with conventional flip angle maps, providing a means of flip angle self-calibration.
Metadata
Item Type: | Article |
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Authors/Creators: |
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Copyright, Publisher and Additional Information: | This is the peer reviewed version of the following article: Marshall, H., Ajraoui, S., Deppe, M. H., Parra-Robles, J. and Wild, J. M. (2012), K-space filter deconvolution and flip angle self-calibration in 2D radial hyperpolarised 3He lung MRI. NMR Biomed., 25: 389–399, which has been published in final form at https://doi.org/10.1002/nbm.1766. This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for Self-Archiving. |
Keywords: | hyperpolarised 3He; lung MRI; radial acquisition; k-space filter |
Dates: |
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Institution: | The University of Sheffield |
Academic Units: | The University of Sheffield > Faculty of Medicine, Dentistry and Health (Sheffield) > Department of Infection, Immunity and Cardiovascular Disease The University of Sheffield > Faculty of Medicine, Dentistry and Health (Sheffield) > The Medical School (Sheffield) > Division of Genomic Medicine (Sheffield) > Department of Oncology and Metabolism (Sheffield) The University of Sheffield > Sheffield Teaching Hospitals |
Depositing User: | Symplectic Sheffield |
Date Deposited: | 09 Aug 2017 13:20 |
Last Modified: | 10 Aug 2017 05:24 |
Published Version: | https://doi.org/10.1002/nbm.1766 |
Status: | Published |
Publisher: | Wiley |
Refereed: | Yes |
Identification Number: | 10.1002/nbm.1766 |
Open Archives Initiative ID (OAI ID): | oai:eprints.whiterose.ac.uk:119985 |