Method and apparatus for magnetic resonance signal acquisition and magnetic resonance imaging apparatus
AssigneeGE Medical Systems Global Technology Company, LLC
InventorTetsuo Ogino
Life of this patent
Estimating the term…
Abstract
For the purpose of acquiring the magnetic resonance signal having a small Maxwell term, a flow encode gradient Gr having the first half and the second half in which the gradient of the respective halves is reversed and having an equal absolute value of the gradient is applied in the readout gradient direction in a time period coincident with the time period when the spin is rephased by means of the slice gradient, and a flow encode gradient having the first half and the second half in which the gradient of the respective halves is reversed and having an equal absolute value of the gradient is applied in the slice gradient direction in a time period coincident with the time period when the spin is dephased by means of the readout gradient.
Claims21
A method for acquiring a magnetic resonance signal from a target with a phase contrast method, said method comprising the steps of:
- applying a static magnetic field;
- applying a high frequency magnetic field;
- applying a slice gradient magnetic field;
- applying a phase encode gradient magnetic field;
- applying a readout gradient magnetic field;
- and
- applying a flow encode gradient magnetic field;
- wherein said flow encode gradient magnetic field has a first half and a second half in which a gradient of respective halves is reversed and has an equal absolute value of said gradient, and is applied in direction of said readout gradient magnetic field in a time period concurrent with a time period when spin of said target is changed in phase by said slice gradient magnetic field.
An apparatus for acquiring a magnetic resonance signal from a target with a phase contrast method, said apparatus comprising:
- means for applying a static magnetic field;
- means for applying a high frequency magnetic field;
- means for applying a slice gradient magnetic field;
- means for applying a phase encode gradient magnetic field;
- means for applying a readout gradient magnetic field;
- and
- means for applying a flow encode gradient magnetic field, said flow encode gradient magnetic field having a first half and a second half in which a gradient of respective halves is reversed and having an equal absolute value of said gradient, wherein said means for applying a flow encode gradient magnetic field comprises:
- first means for applying said flow encode gradient magnetic field in direction of said readout gradient magnetic field in a time period concurrent with a time period when spin of said target is changed in phase by said slice gradient magnetic field.
An apparatus for acquiring a magnetic resonance signal from a target with a phase contrast method, said apparatus comprising:
- means for applying a static magnetic field;
- means for applying a high frequency magnetic field;
- means for applying a slice gradient magnetic field;
- means for applying a phase encode gradient magnetic field;
- means for applying a readout gradient magnetic field;
- means for applying a flow encode gradient magnetic field, said flow encode gradient magnetic field having a first half and a second half in which a gradient of respective halves is reversed and having an equal absolute value of said gradient;
- and
- means for structuring an image based on acquired magnetic resonance signal;
- wherein further comprising:
- first means for causing said means for applying a flow encode gradient magnetic field to apply said flow encode gradient magnetic field in direction of said readout gradient magnetic field in a time period concurrent with a time period when spin of said target is changed in phase by said slice gradient magnetic field.
Dependencies are inferred from the claim text.