Magnetic resonance imaging using spatial modulation of magnetiza

Details Magnetic resonance imaging using spatial modulation of magnetiza Magnetic resonance imaging using spatial modulation of magnetiza

1988-10-06

1991-10-08

Smith, Ruth S.

Surgery

Truss

Pad

128695, A61B 5055

Patent

active

050544896

ABSTRACT:
A novel magnetic resonance imaging technique provides direct imaging of motion by spatially modulating the degree of magnetization prior to imaging. The pre-imaging pulse sequence consists of an RF pulse to produce transverse magnetization, a magnetic field gradient pulse to "wrap" the phase along the direction of the gradient and a second RF pulse to mix the modulated transverse magnetization with the longitudinal magnetization. The resulting images show periodic stripes due to the modulation. Motion between the time of striping and image formation is directly demonstrated as a corresponding displacement of the stripes. Applications include studies of heart wall motion and distinguishing slowly moving blood from thrombus.

REFERENCES:
patent: 4752734 (1988-06-01), Wedeen
patent: 4953554 (1990-09-01), Zerhouni et al.
Hore, P. J., Solvent Suppression in Fourier Transform Nuclear Magnetic Resonance, Journal of Magnetic Resonance, vol. 55, 1983, pp. 283-300.
Zerhouni, et al., "Human Heart: Tagging with MR Imaging-A Method for Noninvasive Assessment of Myocardial Motion", Cardiac Radiology, vol. 169, No. 1, 1988, 59-63.

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