METHOD FOR PROCESSING NMR DATA WITHOUT PHASE-ALTERNATING-PAIR (PAP) AVERAGING

摘要

NMR data are acquired using a phase-alternation of the tipping pulse. Differences between consecutive samples (207) acquired with same or differen t frequencies are determined and an average value of the differences is determined over a sample window (201) and over a range of windows (203,205). This average value, determined separately for the in-phase and quadrature component data is a measure of the systematic noise and may be applied to th e in-phase and quadrature component data to give corrected data with a higher resolution than prior art methods of processing phase altered pulse sequence data (figures 4). The method may also be used to improve the resolution of multifrequency NMR data acquired with a gradient logging tool.