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- W2977303709 abstract "Abstract Objective Quantitative magnetic resonance imaging was used to determine partition coefficients and characteristic time constants for diffusion of MRI contrast agents in disc tissue. Materials and methods Twenty-two excised equine intervertebral discs were exposed to a range of contrast agents: six to manganese chloride, eight to Magnevist (gadopentetate dimeglumine) and eight to Gadovist (gadobutrol), and uptake into the disc was quantified in T 1 -weighted images. Results Diffusion for all contrast agents was approximately 25% faster in the nucleus than in the outer annulus; disc-average time constants ranged from (2.28 ± 0.23) × 10 4 s for Gadovist (uncharged, molecular mass 605 g/mol) to (5.07 ± 0.75) × 10 4 s for the manganese cation (charge + 2). Disc-average partition coefficients ranged from 0.77 ± 0.04 for the anion in Magnevist (charge − 2, molecular mass 548 g/mol) to 5.14 ± 0.43 for the manganese cation. Conclusion The MRI technique provides high-quality quantitative data which correspond well to theoretical predictions, allowing values for partition coefficient and time constant to be readily determined. These measurements provide information to underpin similar studies in vivo and may be used as a model for the transport of nutrients and pharmaceutical agents in the disc." @default.
- W2977303709 created "2019-10-10" @default.
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- W2977303709 date "2019-10-04" @default.
- W2977303709 modified "2023-10-15" @default.
- W2977303709 title "An MRI study of solute transport in the intervertebral disc" @default.
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- W2977303709 doi "https://doi.org/10.1007/s10334-019-00781-z" @default.
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