Using single continuous pulses for manipulating water and fat signals in magnetic resonance imaging

摘要

A method for manipulating magnetic resonance signals of a first chemical species and a second chemical species includes determining a time required to have spins of protons corresponding to the first chemical species acquire a phase shift of 90 degrees relative to spins of protons corresponding to second chemical species. A first pulse portion having a pulse amplitude and a first constant phase is defined. A second pulse portion having the pulse amplitude and a second constant phase, the second constant phase being different from said first constant phase by a multiple of 90 degrees is also defined. Next, a single continuous composite pulse is generated by concatenating the first pulse portion and the second pulse portion, wherein the single continuous composite pulse has a duration such that a time difference between center of the first pulse portion and center of the second pulse portion corresponds to the determined time. Then, the single continuous composite pulse is applied to a plurality of radio frequency coils.

主权项

1. A method for manipulating magnetic resonance signals of a first chemical species and a second chemical species, the method comprising:
determining a time required to have spins of protons corresponding to the first chemical species acquire a phase shift of 90 degrees relative to spins of protons corresponding to second chemical species; defining a first pulse portion having a pulse amplitude and a first constant phase; defining a second pulse portion having the pulse amplitude and a second constant phase, the second constant phase being different from said first constant phase by a multiple of 90 degrees; generating a single continuous composite pulse comprising a concatenation of the first pulse portion and the second pulse portion, wherein the single continuous composite pulse has a duration such that a time difference between center of the first pulse portion and center of the second pulse portion corresponds to the determined time; and applying the single continuous composite pulse to a plurality of radio frequency coils.