Timing signals from 4.5 Resolution Enhancement

Another resolution-enhancement procedure used is convolution difference (Campbell et ai, 1973). This suppresses the ridges from the cross-peaks and weakens the peaks on the diagonal. Alternatively, we can use a shaping function that involves production of pseudoechoes. This makes the envelope of the time-domain signal symmetrical about its midpoint, so the dispersionmode contributions in both halves are equal and opposite in sign (Bax et ai, 1979,1981). Fourier transformation of the pseudoecho produces signals... 

Benner T, Heiland S, Erb G et al (1997) Accuracy of gamma-variate fits to concentration-time curves from dynamic susceptibility-contrast enhanced MRI influence of time resolution, maximal signal drop and signal-to-noise. Magn Reson Imaging 15 307-317... 

Fig. 22 a CP/MAS NMR spectra contact time 8 ms, spinning rate 5550 Hz the guest-free TNP, sample after o-xylene crystallization, b Protonated carbon suppression pulse sequence with a delay of 50 ps. a C-1 signals obtained by applying resolution enhancement line broadening =-40 Hz and Gaussian broadening=50%. (Adopted from [65] with permission)... 

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