By Jürgen Link (auth.), Professor M. Rudin (eds.)
RF Probeheads 1. J. hyperlink, Faellanden, Switzerland The layout of Resonator Probes with Homogeneous Radiofrequency Fields 2. M. Schnall, Philadelphia, PA/USA Probes Tuned to a number of Frequencies for In-Vivo NMR RF Pulses three. P.C.M. van Zijl, Rockville, MD/USA; C.T.W. Moonen, Bethesda, MD/USA Solvent Suppression thoughts for In Vivo Magnetic Resonance Spectroscopy four. M. Garwood, okay. Ugurbil, Minneapolis, MN/USA B1 Insensitive Adiabatic RF Pulses five. P.G. Morris, Nottingham, united kingdom Frequency Selective Excitation utilizing Phase-Compensated RF Pulses in a single andTwo Dimensions 6. S. Mueller, Basel, Switzerland RF Pulses for MultipleFrequency Excitation: conception and alertness Spectrum research 7. R. de Beer, D. van Ormondt, Delft, The Nethelands research of NMR info utilizing Time area becoming systems eight. E.B. Cady, London, united kingdom selection of Absolute Concentrations of Metabolites from NMR Spectra
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35. 36. 37. 38. 39. 40. 41. 42. 43. 44. 45. 46. 47. 31 Chen C-N, Hoult DI, Sank VJ (1983) J Magn Reson 54: 324 Carlson JW (1987) J Magn Reson 74: 376 Hutchinson M, Raff U (1987) Magn Reson Med 6: 87 Holcomb WG, Gore JC (1987) Mag Res Imag 5, supl 1 Joseph PM, Lu D (1989) IEEE Transactions on Medical Imaging, vol 8: 286 Bottomley PA, Charles HC, Roemer P, Flamig D, Engeseth H, Edelstein WA, Mueller OM (1988) Magn Reson Med 7: 319 Tropp J (1989) J Magn Reson 82: 51 Sank VJ, Chen C-N, Hoult DI (1986) J Magn Reson 69: 236 Sotgiu A, Hyde JS (1986) Magn Reson Med : 55 Joseph PM, Saadi-Elmandjra M (1987) J Magn Reson 75: 199 Link J (1989) Dissertation, Basel Krause N (1983) Offenlegungsschrift DE 3133432 AI, Deutsches Patentant Hoult DI (1979) The NMR Receiver; Progress in NMR Spectroscopy Decorps M, B10ndet P, Reutenauer H, Albrand JP (1985) J Magn Reson 65: 100 Hoult DI, Chen C-N, Sank VJ (1984) Magn Reson Med 1: 339 Mueller 0, Edelstein WA (1988) SMRM Book of Abstracts 453 Romeo F, Hoult DI (1984) Magn Reson Med 1: 44 Chen C-N, Sank V, Cohen SM, Hoult DI (1986) Magn Reson Med 3: 722 Sergiadis G (1985) Magn Reson Med 2: 328 Grist TM, Hyde JS (1985) J Magn Reson 61: 571 Murphy MK, Fernandez EJ, Clark DS (1989) Magn Reson Med 12: 382 Hoult DI (1984) in: James TL, Margulis AR (eds) Biomedical magnetic resonance.
Then both the decoupling tank circuit and the sample coil will be tuned at both resonant frequencies by the same tuning circuit. Because of the finite, but small, capacitance of the PIN diode in the off position, Prammer (16) suggests placing a capacitor, Cdec = Cp1N , in parallel with the tuning inductor to compensate. It is also possible to decouple the probe from the transmit field at the higher H) frequency, and use the surface coil for transmitting and receiving at the lower elp) frequency.
If the Q of the tuning inductor is high compared to that of the sample coil, the efficiencies of both modes will improve. This is a quantitative statement of the fact that if the resistive losses in the sample coil are high, the contribution of resistive losses from the tuning circuit become less important. In in-vivo NMR, Qs/Ql < 1 for two reasons. First, the sample inductor geometry is fixed by the required sensitivity profile, while that of the tuning inductor is not constrained, and can always be made to have an optimal Q.