Method of magnetic resonance imaging
AssigneeHitachi, Ltd.
InventorsKenji Takiguchi, Hidemi Shiono, Hiroyuki Itagaki, Etsuji Yamamoto
Life of this patent
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Abstract
In a magnetic resonance imagining method, using an effect that a fluid flows out of a plane where it is selectively excited between the time of applying a 90.degree. radio frequency pulse and the time of applying of a 180.degree. radio frequency pulse, two, images are separately constructed from multiple echo signals which are sampled before applying the 180.degree. radio frequency pulse and multiple echo signals which are sampled after applying the 180.degree. radio frequency pulse. An image of the fluid flow and an image of a static part are separated from each other based on a difference between the two constructed images.
Claims8
A method of magnetic resonance imaging comprising the sequential steps of:
- (a) selectively exciting a region of interest to be imaged by applying to the region of interest a first radio frequency pulse and a gradient magnetic field having a gradient in a first direction, the region of interest including a fluid part and a static part;
- (b) applying to the region of interest
- a readout gradient magnetic field having a gradient in a second direction perpendicular to the first direction while periodically inverting a polarity of the readout gradient magnetic fields, and
- an encode gradient magnetic field having a gradient in a third direction perpendicular to both the first direction and the second direction;
- (c) measuring first multiple echo signals generated by the region of interest during the step (b);
- (d) selectively exciting said region of interest by applying to the region of interest a second radio frequency pulse and the gradient magnetic field having a gradient in the first direction;
- (e) applying to the region of interest
- the readout gradient magnetic field having a gradient in the second direction while periodically inverting the polarity of the readout gradient magnetic fields, and
- the encode gradient magnetic field having a gradient in the third direction;
- (f) measuring second multiple echo signals generated by the region of interest during the step (e);
- (g) constructing
- a first image of the region of interest on the basis of the measured first multiple echo signals, and
- a second image of the region of interest on the basis of the measured second multiple echo signals;
- and
- (h) obtaining an image of only the fluid part of the region of interest on the basis of a difference between the first image and the second image.
Dependencies are inferred from the claim text.