Magnetic resonance imaging apparatus
AssigneeGE Medical Systems Global Technology Company, LLC
InventorMitsuharu Miyoshi
Life of this patent
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Abstract
Versatility and the quality of images are to be improved. As preparation pulses, a first RF pulse to flip along the yz plane spins oriented in a magnetostatic field direction in a subject; a velocity encoding gradient pulse which, in spins flipped by that first RF pulse, mutually shifts the phase of spins in a static state and the phase of spins in a moving state; and a second RF pulse to flip along the yz plane spins whose phase has been shifted by the velocity encoding gradient pulse are successively transmitted. After that, a killer pulse is transmitted to extinguish the transverse magnetizations of the spins flipped by the second RF pulse.
Claims28
A magnetic resonance imaging apparatus which transmits RF pulses to a subject in a magnetostatic space, executes an imaging sequence in which magnetic resonance signals generated in the subject are obtained as imaging data by transmitting gradient pulses to the subject to whom the RF pulses have been transmitted, and generates an image of the subject on the basis of the imaging data obtained by the execution of the imaging sequence,
- said magnetic resonance imaging apparatus comprising:
- a scanning device which executes said imaging sequence and, before the execution of said imaging sequence, executes a preparation sequence in which preparation pulses are transmitted to said subject, wherein:
- said scanning device, after successively transmitting, to said subject as said preparation pulses,
- a first RF pulse to flip spins oriented in a magnetostatic direction in said subject along a first plane including said magnetostatic direction and a first direction orthogonal to said magnetostatic direction,
- a velocity encoding gradient pulse to mutually shift, in said spins flipped by said first RF pulse, the phase of spins of a first velocity and the phase of spin of a second velocity different from said first velocity, and
- a second RF pulse to flip along said first plane said spins whose phase having shifted by said velocity encoding gradient pulse,
- further transmits a killer pulse to generate a gradient magnetic field which extinguishes the transverse magnetization of said spins flipped by said second RF pulse.
A magnetic resonance imaging apparatus which executes an imaging sequence in which magnetic resonance signals generated in a subject are obtained as imaging data by transmitting RF pulses to said subject in a magnetostatic space and generates an image of said subject on the basis of said imaging data obtained by executing said imaging sequence, the magnetic resonance imaging apparatus including:
- a scanning device which executes said imaging sequence and executes before the execution of said imaging sequence a preparation sequence in which preparation pulses are so transmitted as to vary the signal intensity of said imaging data according to the velocity of a fluid flowing in said subject, wherein:
- said scanning device executes said preparation sequence in the systole in heart beating of said subject and executes said imaging sequence in the diastole of said heart beating.
Dependencies are inferred from the claim text.