Frequency selective pulse
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United States of America Patent
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Aug 27, 2002
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app pub date -
Aug 22, 1997
filing date -
Sep 10, 1996
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Abstract
A method of NMR (nuclear magnetic resonance) excitation of a sample having a magnetic moment, including, applying a longitudinal magnetic field to the sample; and changing the magnetic moment in a substantially continuous manner by moving an effective magnetic-field vector .omega..sub.e more than 90.degree., wherein for all portions of the sample in which the moment is changed, the angular velocity of the effective field vector at at least one angle, 90.degree.+.alpha., is different from the angular velocity at 90.degree.-.alpha..
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