Three dimensional Fourier transform, fast spin echo, black blood

Details Three dimensional Fourier transform, fast spin echo, black blood Three dimensional Fourier transform, fast spin echo, black blood

1991-11-27

1993-12-21

Cohen, Lee S.

Surgery

Truss

Pad

324306, 324309, A61B 5055

Patent

active

052713997

ABSTRACT:
Methods for producing an angiograph of a body portion are disclosed as including the steps of subjecting the body portion to electromagnetic energy so as to cause a response related to the magnetization of the body portion. Fast spin echo magnetic resonance measurements are performed on a three dimensional section of the body portion to generate three dimensional intensity information. The three dimensional intensity information is thereafter processed to construct an angiograph. In a preferred embodiment magnetic resonance data is produced by generating a slice gradient, generating a z axis slab selective 90.degree. pulse, generating a z axis slab selective 180.degree. pulse, generating a first phase encoding gradient pulse for a particular K.sub.y coordinate, generating a second phase encoding gradient pulse for a particular K.sub.z coordinate, and generating an x frequency encoding gradient and reading echo signal data from the body portion resulting from the 180.degree. pulse. The method is repeated from the step of generating the 180.degree. pulse, wherein the particular K.sub.z coordinate is incremented for each repetition. The method is thereafter repeated from the step of generating a 90.degree. pulse, wherein the particular K.sub.y component is incremented after the K.sub.z coordinate has been incremented a prescribed number of times. Echo signal data read from the body portion is processed to produce an image.

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