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• W2151892147 startingPage "1822" @default.
• W2151892147 abstract "Levitt and co-workers have described the M2S pulse sequence which transfers between longitudinal and singlet spin order. Building on this work, we describe the construction of a portable M2S pulse sequence generator to increase the relaxation time of polarized compounds. Additionally, we investigate the efficiency of spin order transfer under conditions where physical parameters of the system are not known precisely.A portable M2S generator is built. Longitudinally polarized N2O is converted to the singlet state by both adiabatic transfer and by the M2S sequence. Density matrix simulations are used to model the effects of mismatched chemical shift, flip angle, and scalar couplings.Density matrix simulations suggest that to convert 95% of the longitudinal m = 1 triplet state population to the singlet order we must match the Larmor precession frequency to the excitation radiofrequency field by 10%, the scalar couplings must be determined to better than 0.6%, and the flip angle must be calibrated to better than 2%.The sequence is robust against many mismatched physical parameters of the species we are converting. Additionally, the instrument's portability allows for the conversion of hyperpolarized species near a polarizer. The lifetime is increased by ∼12-fold. This is highly advantageous in systems where the hyperpolarized media relax rapidly." @default.
• W2151892147 created "2016-06-24" @default.
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• W2151892147 date "2015-05-14" @default.
• W2151892147 modified "2023-10-06" @default.
• W2151892147 title "Versatile pulse sequence device to conserve hyperpolarization for NMR and MRI studies" @default.
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• W2151892147 doi "https://doi.org/10.1002/mrm.25679" @default.
• W2151892147 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/25976973" @default.
• W2151892147 hasPublicationYear "2015" @default.
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