Fast NMR cardiac profile imaging

Details Fast NMR cardiac profile imaging Fast NMR cardiac profile imaging

1989-08-11

1991-02-26

Jaworski, Francis

Surgery

Truss

Pad

324309, A61B 505

Patent

active

049953940

ABSTRACT:
A substantially continuous image, recording motion of a portion of a sample, is provided by first NMR exciting, through use of a rotating-gradient (.rho.) pulse signal, a relatively narrow cylindrical region, typically with diameter less than 1 inch, of magnetization intersecting the sample to be imaged and then acquiring the NMR response signal thus excited, in the presence of a readout gradient oriented along the length of the cylindrical excitation beam and establishing position thereon. A Fourier transformation of the acquired data allows display of a real-time record of the profile of the sample along the axis of the cylindrical probe beam. The cylinder-beam axis can be oriented in an arbitrary direction by proper mixing of the excitation and readout gradient fields; use of three orthogonal gradients in a Cartesian coordinate system is presently preferred. Spatial offsetting of the cylindrical beam, from the center of the static magnetic field of the NMR imaging system, to any specific location within the system's imaging volume, can be obtained by frequency modulation of the .rho. pulse RF waveform.

REFERENCES:
patent: 4516582 (1985-05-01), Redington
patent: 4739766 (1988-04-01), Riederer
patent: 4857846 (1989-08-01), Carlson

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