โ Scribed by A Bifone; G.S Payne; M.O Leach
No coin nor oath required. For personal study only.
The demagnetizing field produced by the nuclear polarization can induce refocusing of multiple spin echoes. We show that multiple spin echoes can be observed in vivo with a clinical MR system at 1.5 T. Strategies for the spatial localization of the multiple spin echo signals are considered. Multiple spin echo studies in brain white matter and skeletal muscle in healthy volunteers are reported. The dependence of the signal amplitudes on the experimental parameters is compared with the theory. The sources of contrast for MRI and the perspectives for medical applications are discussed.
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Based on the Bloch equations, the general response of a nuclear by introducing the echo path concept. But there are many spin-1 2 system to multiple RF pulses with arbitrary phases and flip cases where the rotation axis is not fixed in a particular angles is presented. The general solution is expres
The condition for an echo formation is reviewed in the context of half-integer quadrupole system. The common features of the classical echo phenomena and the coherence transfer echo are highlighted. The article also explains how the measurement of a series of coherence transfer echoes achieves the h
Free radical electron paramagnetic resonance (e.p.r.) spectra of coal are comprised of unresolved hyperfine multiplets with widths of ~770 kHz, (TJ', at 90-l 10 K. Unresolved hyperfine interactions are measured in the spin echo decay modulation and locate nuclei in the coal structure relative to the