Method for nuclear magnetic resonance measurements on low concentration solutes in solvent
AssigneeHitachi, Ltd.
InventorsYukari Onodera, Etsuji Yamamoto, Ryuichi Suzuki
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Abstract
NMR signals of low concentration solutes are obtained with suppression of NMR signal of solvent by sequentially applying a first RF pulse sequence, a 180.degree. RF pulse and a second RF pulse sequence to an object. Each of the first and second RF pulse sequence includes equally spaced RF pulses which have flip angles in accordance with binominal coefficients. Phase errors due to inhomogeneity of a static magnetic field are cancelled through the two-time application of equally spaced RF pulse sequence.
Claims12
A nuclear magnetic resonance measuring method of an object placed in a space to which a static magnetic field having slight inhomogeneity is applied, said method comprising the steps of:
- applying a first equidistant radio frequency pulse sequence the phases of which are inversed sequentially and which has a flip angle ratio in accordance with a binominal coefficient, to said object;
- applying consecutively an inversion radio frequency pulse to said object;
- applying further a second equidistant radio frequency pulse sequence the phases of which are inversed sequentially and which has a flip angle ratio in accordance with a binominal coefficient, to said object;
- and
- measuring transverse magnetization signals resulting from said object.
Dependencies are inferred from the claim text.