Method and apparatus for merging of NMR echo trains in the time domain
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United States of America Patent
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Apr 23, 2002
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app pub date -
Aug 10, 1999
filing date -
Aug 31, 1998
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Abstract
Proposed is a new method and system to obtain enhanced-resolution NMR data by merging, in the time domain, different NMR pulse echo trains into a single echo train. The input echo trains can be acquired with different inter-echo spacing, wait time, and signal-to-noise ratio parameters that are optimized to correspond to both fast and slow portions of the T.sub.2 spectrum. The merged echo trains are inverted into complete T.sub.2 spectra in a single step thereby overcoming ambiguities and other limitations of prior art methods. In a preferred embodiment the merging process does not require a priori information about T.sub.1, and the merged echo trains are optimized in with respect to T.sub.2 resolution. The method of this invention is preferably practiced with the latest generation of multi-volume NMR logging tools, that allow simultaneous recordation of NMR data with different inter-echo spacing T.sub.e, wait time T.sub.w, and signal-to-noise ratio (SNR) parameters.
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