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Magnetic field dependence of proton spin-lattice relaxation times.
| Content Provider | Semantic Scholar |
|---|---|
| Author | Korb, J. P. Bryant, Robert G. |
| Copyright Year | 2002 |
| Abstract | The magnetic field dependence of the water-proton spin-lattice relaxation rate (1/T(1)) in tissues results from magnetic coupling to the protons of the rotationally immobilized components of the tissue. As a consequence, the magnetic field dependence of the water-proton (1/T(1)) is a scaled report of the field dependence of the (1/T(1)) rate of the solid components of the tissue. The proton spin-lattice relaxation rate may be represented generally as a power law: 1/T(1)omega = A omega(-b), where b is usually found to be in the range of 0.5-0.8. We have shown that this power law may arise naturally from localized structural fluctuations along the backbone in biopolymers that modulate the proton dipole-dipole couplings. The protons in a protein form a spin communication network described by a fractal dimension that is less than the Euclidean dimension. The model proposed accounts quantitatively for the proton spin-lattice relaxation rates measured in immobilized protein systems at different water contents, and provides a fundamental basis for understanding the parametric dependence of proton spin-lattice relaxation rates in dynamically heterogeneous systems, such as tissues. |
| Starting Page | 393 |
| Ending Page | 415 |
| Page Count | 23 |
| File Format | PDF HTM / HTML |
| Alternate Webpage(s) | http://mri-q.com/uploads/3/4/5/7/34572113/10185_ftp.pdf |
| PubMed reference number | 12111928v1 |
| Volume Number | 48 |
| Issue Number | 1 |
| Journal | Magnetic resonance in medicine |
| Language | English |
| Access Restriction | Open |
| Subject Keyword | Biopolymers Body tissue Dependence Kinetics Magnetic Fields Magnetic Resonance Imaging Population Parameter Proton-Translocating ATPases Protons Staphylococcal Protein A Vertebral column contents - HtmlLinkType |
| Content Type | Text |
| Resource Type | Article |
