G - Physics – 01 – N
Patent
G - Physics
01
N
324/1
G01N 24/08 (2006.01) A61B 5/05 (2006.01) G01R 33/483 (2006.01) G01R 33/56 (2006.01)
Patent
CA 1186377
A b s t r a c t A Method for Measuring the Magnetic Nuclear Resonance For the purpose of limiting NMR spectroscopy to a selected area of a body the said area is prepared by applying first a homogeneous magnetic field passing through the entire body and superimposing thereafter upon the said magnetic field a first magnetic field of identical orientation whose strength varies in a first sense (first field gradient), exciting thereafter all the selected nuclear spins present within the body and in addition, selectively, only the nuclear spins present in a first body plane containing the volume element and extending vertically to the said first field gradient so that the selected nuclear spins contained in this body plane are returned to the direction of the homogeneous magnetic field while the nuclear spins outside this plane receive an orientation differing from the sense of the homogeneous magnetic field. This process is repeated twice, using each time a different gradient field, so that thereafter only the nuclear spins located within the volume element selected by means of the three gradient fields are parallel to the homogeneous magnetic field and can be excited by means of one or more pulses to obtain an oscilla- tion generating an induction signal. Residual signals having their origin in body areas outside the selected volume element can be eliminated if in two successive measurements excitation of the nuclear spins contained in - 2 - the volume element or 1 the one hand and the rest or the nuclear spins on the other hand is effected for one of the groups always in the same phase and for the other group alternately in the same and in opposite phase so that when subtracting or adding the signals obtained in successive measurements the signals resulting from the rest of the nuclear spins are eliminated whereas the signals supplied by the selected volume element are added up.
423402
Brunner Peter
Post Hans
Ratzel Dieter
Bruker Medizintechnik Gmbh
Gowling Lafleur Henderson Llp
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