MRI method and apparatus for selective image suppression of mate

Details MRI method and apparatus for selective image suppression of mate MRI method and apparatus for selective image suppression of mate

1995-05-15

1997-08-12

Lateef, Marvin M.

Surgery

Truss

Pad

324307, 324309, A61B 5055

Patent

active

056555318

ABSTRACT:
The selective imaging of an object having two materials with different relaxation times (T1 or T2) is provided by using a driven equilibrium sequence (T2 weighted preparation sequence) followed by an inversion recovery sequence. In the driven equilibrium sequence the object is placed in a static magnetic field along a longitudinal axis, an excitation pulse is applied to tip nuclei spins into a transverse plane, and at least one refocusing pulse is applied to produce a spin echo having a magnetization component as a function of relaxation time. At least one pulse is then applied to the object to drive the spin echo to an inverted position along the longitudinal axis. A readout excitation is then applied at a later time when the longitudinal magnetization of one material is substantially reduced. In one embodiment, an inversion pulse is applied prior to the T2 weighted preparation sequence.

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Brittain et al., Coronary Antiography With Magnetization-Prepared T2 Contrast, Magnetic Resonance in Medicine in Medicine, vol. 33, No. 5, May 1995, pp. 689-696.
Brittain et al., Three-Dimensional Flow-Independent Peripheral Angiography, SRM, to appear Aug. 1995, 1 page.
Brittain et al., Coronary Angiography with Magnetization-Prepared T2 Contrast, MRM, to appear, 1995.

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