The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Dec. 22, 1987
Filed:
Jun. 18, 1985
Roger Ordidge, Eynsham, GB;
Oxford Research Systems Limited, Eynsham, GB;
Abstract
A method of obtaining an NMR spectrum from a first region lying wholly within a second region of a sample material, comprises obtaining a signal indicative of a first NMR spectrum from substantially all of the second region of the sample material applying to the sample a magnetic field gradient, and simultaneously applying to the sample an Rf perturbing pulse having an amplitude and a frequency distribution such as to perturb nuclear spins in the said first region, but not outside it, removing the magnetic field gradient, and thereafter obtaining from the sample a signal indicative of a second NMR spectrum before relaxation of the perturbed spins in the said first region, and comparing the said first and second signals to obtain a difference spectrum attributable to the said region. Three separate perturbing pulses are preferably employed, each in the presence of a corresponding field gradient. The experiment is preferably repeated a large number of times, with the Rf carrier frequency stepped between each Rf pulse (for example every 500 microseconds).