Patent ID: 8380282

Claim:
A method for acquiring electromagnetic signals received from at least one part of a body placed in a system comprising means for generating a magnetic induction B 0 , said magnetic induction comprising gradients in certain directions in space, means for transmitting radio frequency wave pulse sequences perpendicular to the magnetic induction B 0 in a range of adjustable frequencies, and means for detecting electromagnetic signals received from said body part, the method comprising the following steps: a) injecting, into said body part, an amount of contrast product capable of being temporarily fixed in or of passing through an observed zone of said body part, said contrast product comprising at least one element capable of causing a chemical shift of a resonance frequency of water hydrogen protons of said body part; b) determining a new resonance frequency, shifted with respect to the Larmor frequency (v 0 ) for the water hydrogen protons of said body part nearby said contrast product; c) exciting said body part by means of a radio frequency wave pulse sequence in a range of frequencies adjusted according to the magnetic induction B 0 and to the new resonance frequency determined at step b) resulting from the chemical shift of the resonance frequency of water hydrogen protons for at least some of said radio frequency waves; d) detecting, coherently with the excitation of step c), electromagnetic signals received from said body part, said signals corresponding substantially to magnetic resonance signals of the water hydrogen protons of the observed zone of said body part having undergone the chemical shift of the resonance frequency.