Control of setting phase-encoding direction in MRI

Details Control of setting phase-encoding direction in MRI Control of setting phase-encoding direction in MRI

1997-10-02

2000-05-30

Lateef, Marvin M.

Surgery

Diagnostic testing

Detecting nuclear, electromagnetic, or ultrasonic radiation

324309, 600428, A61B 5055

Patent

active

060685956

ABSTRACT:
By employing controlled setting of a phase-encoding direction in MRI, for imaging a tissue or blood flow composed of spins whose time T.sub.2 is rather short or ranges from 100 to 200 milliseconds, signal levels induced by the blood flow or the like are raised in order to maintain a good signal-to-noise ratio. An image enjoying an excellent depiction ability can be produced without the loss of information of directivities of blood flows or tissues running in diverse directions. An MRI system utilizing the Fourier transform comprises an element for scanning the same region to be imaged of a subject a plurality of times while changing phase-encoding directions, and an element for producing image data of one frame on the basis of MR rawdata of a plurality of frames. The producing element includes, for example, a unit for reconstructing image data in the real space by processing frame by frame MR raw data of a plurality of frames, and a unit for synthesizing reconstructed image data of the plurality of frames so as to produce image data of one frame. Synthesis is, for example, addition or maximum intensity projection.

REFERENCES:
Constable et al, "The Loss of Small Objects in Variable TE Imaging: Implications for FSE, RARE, and EPI", Magnetic Resonance in Medicine 28, pp. 9-24 (1992).
Hinks et al, "Gradient Moment Nulling in Fast Spin Echo", MRM 32: 698-706 (1994).

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