The present invention is directed to methods for chemical species signal
suppression in magnetic resonance imaging procedures, wherein Dixon
techniques are enhanced by continuously sampling techniques. In the
invention, k-space data is acquired during the entire period of read
gradient associated with a gradient echo pulse acquisition scheme. The
invention utilizes a total sampling time (TST) acquisition during the
entire read gradient, using three echoes of a TST data set to achieve
chemical species separation in both homogenous fields as well as areas of
field inhomogeneity. As an example, a continuously sampled rectilinearly
FLASH pulse sequence is modified such that the time between echoes was
configured to be 2.2 milliseconds, with TE selected to allow 180.degree.
phase variation in the fat magnetization between each of the three TE's
(TE1, TE2, and TE3). Data collected during the dephase and rephase
gradient lobes are defined as a first Dixon acquisition, with data
collected by the read gradient lobe being defined as a second Dixon
acquisition. Two point Dixon reconstruction techniques are used to form
images for each chemical species, such as for generating water and fat
images of the scanned object region. Other corrections, such as
off-resonance correction may be applied on the image data.