Method for reduction of motion artifacts in Fourier transform NM

Details Method for reduction of motion artifacts in Fourier transform NM Method for reduction of motion artifacts in Fourier transform NM

1984-12-18

1986-09-30

Howell, Kyle L.

Surgery

Truss

Pad

324309, A61B 505

Patent

active

046141952

ABSTRACT:
A reduction in motion-induced image artifact, occurring when imaging moving subjects using Fourier transform (FT) NMR techniques, is achieved by recognizing that the greatest contribution to the artifacts is simple geometric motion (such as respiration). The method relies on avoiding the synchrony between the sequence repetition time of an FT pulse sequence, such as spin warp, and the period of the motion. In one preferred embodiment, the different amplitude values of the phase-encoding gradient are selected randomly, rather than sequentially. In another preferred embodiment, gradient amplitude values are selected by alternating high and low values in the temporal implementation of the pulse sequence.

REFERENCES:
patent: 4431968 (1984-02-01), Edelstein et al.
patent: 4443760 (1984-04-01), Edelstein et al.
patent: 4506223 (1985-03-01), Bottomley et al.
Johnson et al, "Instrumentation of NMR Spin-Warp Imaging", J. Phys. E:Sci. Instrum., vol. 15, No. 1, Jan. 1982.
General Electric brochure, "NMR a Perspective on Imaging", 1982, pp. 1-29.

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