Iterative reconstruction of radially-sampled 31 P bSSFP data using prior information from 1 H MRI

Rink, Kristian; Benkhedah, Nadia; Berger, M.; Gnahm, Christine; Behl, Nicolas G.R.; Lommen, Jonathan; Stahl, Vanessa; Bachert, Peter; Ladd, Mark E.; Nagel, Armin M.

doi:10.1016/j.mri.2016.11.013

Cited by 4 publications

(1 citation statement)

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“…Constantinides et al first proposed an iterative reconstruction algorithm to enhance low‐resolution sodium MRI by incorporating high‐resolution hydrogen MRI before the onset of CS 76 . While CS exploits the sparsity of non‐hydrogen MRI images to accelerate data acquisition, incorporating prior anatomical knowledge from hydrogen MRI into the CS reconstruction algorithm provides further opportunities to improve image quality for non‐hydrogen MRI, such as phosphorus ( 31 P), 77 hyperpolarized helium ( 3 He), 78 and fluorine ( 19 F) 79 . Gnahm et al first introduced this concept to CS sodium MRI by using a hydrogen support region constraint 32 and further advanced it by adding an edge‐weighting‐based constraint 31 to exploit hydrogen anatomical information.…”

Section: Advanced Techniques In Compressed Sensing‐based Sodium Mrimentioning

confidence: 99%

Compressed Sensing in Sodium Magnetic Resonance Imaging: Techniques, Applications, and Future Prospects

Chen

Shah

Worthoff

2021

Magnetic Resonance Imaging

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Sodium ( 23 Na) yields the second strongest nuclear magnetic resonance (NMR) signal in biological tissues and plays a vital role in cell physiology. Sodium magnetic resonance imaging (MRI) can provide insights into cell integrity and tissue viability relative to pathologies without significant anatomical alternations, and thus it is considered to be a potential surrogate biomarker that provides complementary information for standard hydrogen ( 1 H) MRI in a noninvasive and quantitative manner. However, sodium MRI suffers from a relatively low signal-to-noise ratio and long acquisition times due to its relatively low NMR sensitivity. Compressed sensing-based (CS-based) methods have been shown to accelerate sodium imaging and/or improve sodium image quality significantly. In this manuscript, the basic concepts of CS and how CS might be applied to improve sodium MRI are described, and the historical milestones of CS-based sodium MRI are briefly presented. Representative advanced techniques and evaluation methods are discussed in detail, followed by an expose of clinical applications in multiple anatomical regions and diseases as well as thoughts and suggestions on potential future research prospects of CS in sodium MRI.

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Section: Advanced Techniques In Compressed Sensing‐based Sodium Mrimentioning

confidence: 99%

Compressed Sensing in Sodium Magnetic Resonance Imaging: Techniques, Applications, and Future Prospects

Chen

Shah

Worthoff

2021

Magnetic Resonance Imaging

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Accelerated B1+$$ {\mathrm{B}}_1^{+} $$ mapping and robust parallel transmit pulse design for heart and prostate imaging at 7 T

Egger,

Nagelstraßer,

Wildenberg

et al. 2024

Magnetic Resonance in Med

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PurposeTo investigate the impact of reduced k‐space sampling on mapping and the resulting impact on phase shimming and dynamic/universal parallel transmit (pTx) RF pulse design.MethodsChannel‐wise 3D maps were measured at 7 T in 35 and 23 healthy subjects for the heart and prostate region, respectively. With these maps, universal phase shims optimizing homogeneity and efficiency were designed for heart and prostate imaging. In addition, universal 4kT‐point pulses were designed for the heart. Subsequently, individual phase shims and individual 4kT‐pulses were designed based on maps with different acceleration factors and tested on the original maps. The performance of the pulses was compared by evaluating their coefficients of variation (CoV), efficiencies and specific energy doses (SED). Furthermore, validation measurements were carried out for one heart and one prostate subject.ResultsFor both organs, the universal phase shims showed significantly higher efficiencies and lower CoVs compared to the vendor provided default shim, but could still be improved with individual phase shims based on accelerated maps (acquisition time = 30 s). In the heart, the universal 4kT‐pulse achieved significantly lower CoVs than tailored phase shims. Tailored 4kT‐pulses based on accelerated maps resulted in even further reduced CoVs or a 2.5‐fold reduction in SED at the same CoVs as the universal 4kT‐pulse.ConclusionAccelerated maps can be used for the design of tailored pTx pulses for prostate and cardiac imaging at 7 T, which further improve homogeneity, efficiency, or SED compared to universal pulses.

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Phosphorus metabolism in the brain of cognitively normal midlife individuals at risk for Alzheimer's disease

Parasoglou

Osorio

Khegai

et al. 2022

Neuroimage: Reports

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Iterative reconstruction of radially-sampled 31 P bSSFP data using prior information from 1 H MRI

Cited by 4 publications

References 50 publications

Compressed Sensing in Sodium Magnetic Resonance Imaging: Techniques, Applications, and Future Prospects

Compressed Sensing in Sodium Magnetic Resonance Imaging: Techniques, Applications, and Future Prospects

Accelerated B1+$$ {\mathrm{B}}_1^{+} $$ mapping and robust parallel transmit pulse design for heart and prostate imaging at 7 T

Phosphorus metabolism in the brain of cognitively normal midlife individuals at risk for Alzheimer's disease

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