Abstract
Objective
Point spread function (PSF) mapping enables estimating the displacement fields required for distortion correction of echo planar images. Recently, a highly accelerated approach was introduced for estimating displacements from the phase slope of under-sampled PSF mapping data. Sampling schemes with varying spacing were proposed requiring stepwise phase unwrapping. To avoid unwrapping errors, an alternative approach applying the concept of finite rate of innovation to PSF mapping (FRIP) is introduced, using a pattern search strategy to locate the PSF peak, and the two methods are compared.
Materials and methods
Fully sampled PSF data was acquired in six subjects at 3.0 T, and distortion maps were estimated after retrospective under-sampling. The two methods were compared for both previously published and newly optimized sampling patterns. Prospectively under-sampled data were also acquired. Shift maps were estimated and deviations relative to the fully sampled reference map were calculated.
Results
The best performance was achieved when using FRIP with a previously proposed sampling scheme. The two methods were comparable for the remaining schemes. The displacement field errors tended to be lower as the number of samples or their spacing increased.
Conclusion
A robust method for estimating the position of the PSF peak has been introduced.
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Acknowledgements
RGN was funded by the Fundação para a Ciência e a Tecnologia grants UID/BIO/00645/2013, UID/EEA/50009/2013 and IF/00364/2013.
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Nunes: protocol/project development; data collection or management; data analysis. Hajnal: protocol/project development.
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All procedures performed in studies involving human participants were in accordance with the ethical standards of the institutional and/or national research committee and with the 1964 Helsinki Declaration and its later amendments or comparable ethical standards.
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Informed consent was obtained from all individual participants included in the study.
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The authors declare that they have no conflict of interest.
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Nunes, R.G., Hajnal, J.V. Distortion correction of echo planar images applying the concept of finite rate of innovation to point spread function mapping (FRIP). Magn Reson Mater Phy 31, 449–456 (2018). https://doi.org/10.1007/s10334-017-0669-1
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DOI: https://doi.org/10.1007/s10334-017-0669-1