Phosporus-31 solid-state NMR in high-field gradients: Prospects for imaging bone using the long echo-train summation technique (LETS)

Stray-field techniques are reported for P-31 studies of solids for a variet y of compounds including bone, bone meal and calcium hydroxyapatite. Long H ahn echo trains produced by the application of many pulses were used as in the long echo-train summation technique. Double-resonance enhancements of P -31 by use of both direct and indirect experiments were attempted on a samp le of NH4PF6: P-31{F-19} double resonance produced, at most, a 26% increase in the initial level of the P-31 echo signal. (C) 2001 Academic Press.