Abstract
Objectives
A postprocessing technique termed 3D true-phase polarity recovery with independent phase estimation using three-tier stacks based region growing (3D-TRIPS) was developed, which directly reconstructs phase-sensitive inversion-recovery images without acquisition of phase-reference images. The utility of this technique is demonstrated in myocardial late gadolinium enhancement (LGE) imaging.
Materials and methods
A data structure with three tiers of stacks was used for 3D-TRIPS to directly achieve reliable region growing for successful background-phase estimation. Fifteen patients undergoing postgadolinium 3D phase-sensitive inversion recovery (PSIR) cardiac LGE magnetic resonance imaging (MRI) were recruited, and 3D-TRIPS LGE reconstructions were compared with standard PSIR. Objective voxel-by-voxel comparison was performed. Additionally, blinded review by two radiologists compared scar visibility, clinical acceptability, voxel polarity error, or groups and blurring.
Results
3D-TRIPS efficiently reconstructed postcontrast phase-sensitive myocardial LGE images. Objective analysis showed an average 95% voxel-by-voxel agreement between 3D-TRIPS and PSIR images. Blinded radiologist review demonstrated similar image quality between 3D-TRIPS and PSIR reconstruction.
Conclusion
3D-TRIPS provided similar image quality to PSIR for phase-sensitive myocardial LGE MRI reconstruction. 3D-TRIPS does not require acquisition of a reference image and can therefore be used to accelerate phase-sensitive LGE imaging.
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Acknowledgements
This study was supported in part by Grants from the National Institutes of Health R21-EB017514.
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HL: Protocol/project development, data collection or management. GJW: Data collection or management, data analysis. NB: Protocol/project development, Data analysis. JHM: Protocol/project development, data analysis. DSH: Data analysis. HW: Data analysis. JW: Protocol/project development. Gunn: Data analysis. WW: Data analysis. CY: Protocol/project development, data collection or management, data analysis.
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D. Hippe has received grants from GE Healthcare and Philips Healthcare. N. Balu has received grants from Philips Healthcare. C. Yuan has received grants from Philips Healthcare and is a Member of Radiology Advisory Network of Philips Healthcare. The other authors declare that they have no conflict of interest.
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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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Liu, H., Wilson, G.J., Balu, N. et al. 3D true-phase polarity recovery with independent phase estimation using three-tier stacks based region growing (3D-TRIPS). Magn Reson Mater Phy 31, 87–99 (2018). https://doi.org/10.1007/s10334-017-0666-4
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DOI: https://doi.org/10.1007/s10334-017-0666-4