Myocardial proton spin-lattice relaxation times in vitro: Effect of elapsed time after excision
β Scribed by Cam F. Campbell; Gerald A. Pearson; Steve M. Collins; David J. Skorton
- Book ID
- 108009145
- Publisher
- Elsevier Science
- Year
- 1986
- Tongue
- English
- Weight
- 697 KB
- Volume
- 4
- Category
- Article
- ISSN
- 0730-725X
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The temperature dependences of the proton spin-lattice, Tt, and spin-spin, T2, relaxation times of isotactic polypropylene films with different thermal histories and atactic fraction were investigated. A T~ minimum occurs for both melt-quenched and annealed samples at about 70Β°C. It shifts to lower
Proton spectra of solids are usually broadened by strong proton homonuclear dipolar interactions. However, substantial line narrowing may be achieved by Magic Angle Spinning (MAS) in systems of low proton density or in systems in which rapid molecular motions occur. In such conditions, T1(H) measure