Importance

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Abstract

In a fast scanning technique in which the repeat time TR is less than the T2 relaxation time, a first generation component (34), a second generation component (52), and a third generation component (62) are each phase encoded by a phase encode gradient (36). The persisting second and third generation components are encoded with the sum of the phases with which they have been encoded in the present and prior repetitions. A composite data line is sampled during each echo and includes a first component (44), a second component (54), and a third component (64), each component having an independent phase encoding. The data lines are each stored in a first data set memory (80) in accordance with the phase encoding of the first generation component, in a second data set memory (82) in accordance with the phase encoding of the second component and in a third data set memory means (84) in accordance with the phase encoding of the third generation component. Each of these data sets is filtered (110), transformed (112) into a magnitude image (114) and phase image (116). The magnitude and phase images are filtered (120, 122) and reverse transformed (126) back into a filtered data set (128) and weighted (130) to form an estimate of one component of the other data sets. The estimate is subtracted (138, 140) from the other data sets. This process is iteratively repeated until each data set contains substantially only the data of one component. Each data set is then reconstructed (98) into a separate image representation.

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First Claim