RIDE'n RIPT -- Ring Down Elimination in Rapid Imaging Pulse Trains
A new pulse sequence is introduced for compensation of acoustic ringing effects, which occur in rotating-frame images obtained with the rapid imaging pulse trains (RIPT). The new sequence (RIDE'n RIPT) combines features of ring down elimination (RIDE), the most common difference-spectroscopy sequence for acoustic-ringing compensation, with the advantages of RIPT for fast acquisition of magnetization profiles in B1 field gradients. For even greater time efficiency in many experiments, the two transients of RIDE'n RIPT are combined to a single transient in which data for the difference spectroscopy are collected sequentially. RIDE'n RIPT was used to record one-dimensional profiles of the proton magnetization in supercritical fluid samples of methane in carbon dioxide. The profiles showed substantial improvements over profiles obtained from standard RIPT. To withstand the high pressures required for the supercritical carbon dioxide mixtures, a toroid cavity autoclave (TCA) was used as the NMR resonator and pressure vessel. The well-defined, strong, and nonuniform B1 field of the TCA was used to resolve distances along the radial dimension.
K. Woelk et al., "RIDE'n RIPT -- Ring Down Elimination in Rapid Imaging Pulse Trains," Journal of Magnetic Resonance, vol. 159, no. 2, pp. 207-212, Elsevier, Dec 2002.
The definitive version is available at https://doi.org/10.1016/S1090-7807(02)00105-2
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