RF pulse applying method and MRI apparatus
AssigneeGE Medical Systems Technology Company, LLC
InventorKenji Asano
Life of this patent
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Abstract
The effects of prior pulses are to be enhanced. A pulse string which monotonically decreases the flip angle is inserted between the prior pulse in one round and the imaging pulse in the previous round, and a pulse string which monotonically increases the flip angle is inserted between the prior pulse and the imaging pulse in one round. A return from the steady state to the equilibrium state can be achieved not only for on-resonance magnetization but also for off-resonance magnetization before the prior pulse is applied. Therefore, the effects of the prior pulse P can be fully attained. Further, not only on-resonance magnetization but also off-resonance magnetization can be brought close to the steady state before the imaging pulse is applied.
Claims20
An RF pulse applying method, wherein collection of data for imaging is repeated by applying an imaging pulse after the application of each prior pulse of a plurality of prior pulses, inserting a flip angle monotonically decreasing pulse string that monotonically decreases a flip angle between a first imaging pulse and a first prior pulse that follows said first imaging pulse.
An MRI apparatus comprising:
- a prior pulse applying device which applies a plurality of prior pulses;
- an imaging pulse applying device which applies an imaging pulse after each prior pulse of said plurality of prior pulses;
- and
- a flip angle monotonically decreasing pulse string applying device that applies a flip angle monotonically decreasing pulse string that monotonically decreases a flip angle between a first imaging pulse and a first prior pulse that follows said first imaging pulse.
Dependencies are inferred from the claim text.