In imaging a first species having a short T2 magnetic resonance parameter
in the presence of a second and third species having longer T2
parameters, a method of suppressing signals from the longer T2 species
comprises the steps of: a) applying a RF saturation pulse with multiple
suppression bands for the second and third species to excite nuclei spins
of the longer T2 species with the magnitude of the RF pulse being
sufficiently low so as not to excite nuclei spins of the short T2
species, the RF saturation pulse being sufficiently long to rotate the
longer T2 species nuclei spins into a transverse plane, and b) dephasing
the longer T2 species nuclei spins in the transverse plane. An imaging
pulse sequence is then applied to image the short T2 species.
Alternatively, the method can comprise the steps of a) applying a first
inversion pulse for selective inverting species of the second longer T2
species, b) obtaining first image signals after step a, c) applying a
second inversion pulse for selectively inverting species of the third
longer T2 species, d) obtaining second image signals after step c), and
e) combining the first image signals and the second image signal to image
the first short T2 species with the longer second and third species
cancelling in the combination. In each of these methods, either the
second or third longer T2 species can be suppressed without suppressing
the other by applying the RF saturation or inversion pulse only to the
species to be suppressed.