Skip to Content
Find More Like This
Return to Search

Relaxation time estimation in surface NMR

United States Patent

9,599,688
March 21, 2017
View the Complete Patent at the US Patent & Trademark Office
NMR relaxation time estimation methods and corresponding apparatus generate two or more alternating current transmit pulses with arbitrary amplitudes, time delays, and relative phases; apply a surface NMR acquisition scheme in which initial preparatory pulses, the properties of which may be fixed across a set of multiple acquisition sequence, are transmitted at the start of each acquisition sequence and are followed by one or more depth sensitive pulses, the pulse moments of which are varied across the set of multiple acquisition sequences; and apply processing techniques in which recorded NMR response data are used to estimate NMR properties and the relaxation times T.sub.1 and T.sub.2* as a function of position as well as one-dimensional and two-dimension distributions of T.sub.1 versus T.sub.2* as a function of subsurface position.
Grunewald; Elliot D. (Seattle, WA), Walsh; David O. (Mukilteo, WA)
VISTA CLARA INC. (Mukilteo, WA)
13/ 750,984
January 25, 2013
STATEMENT OF GOVERNMENT SUPPORT This invention was made in part with Government support under Agreement DE-FG02-08ER84979 awarded by the US Department of Energy. The Government has certain rights in this invention.