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Characterization of Hyperpolarized Xe-129 NMR Spectra
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1 148
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691
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This book describes the modeling and experimental§effort in trying to use hyperpolarized Xe-129 (H-Xe)§dissolved in Perfluorooctyl Bromide (PFOB) emulsions§as an Nuclear Magnetic Resonance (NMR) contrast agent§for cancer detection. H-Xe dissolved in PFOB§emulsions stabilized with egg-yolk phospholipid (EYP)§has been suggested as a possible in vivo NMR contrast§agent. A two-compartment radial diffusive exchange§model based on the generalized Bloch equations was§developed. The model was used to investigate the NMR§spectra of H-Xe dissolved in PFOB emulsions. The§permeability of the EYP membrane was estimated by§fitting the linewidths of the experimental NMR§spectra with the modeled spectra linewidths. The§experiments also showed that the linewidths of the§NMR spectra of H-Xe in PFOB emulsions depend on the§PFOB concentration because of the H-Xe diffusive§exchange. Bulk water flow measurements were§demonstrated by dynamic acquisition of H-Xe NMR§spectra while the bolus formed of H-Xe gas in PFOB§emulsions diluted during the passage through a coil.
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