Method of producing MR image and MRI system

Details Method of producing MR image and MRI system Method of producing MR image and MRI system

1995-05-31

1998-01-06

Lateef, Marvin M.

Surgery

Truss

Pad

324307, 324309, A61B 5055

Patent

active

057043574

ABSTRACT:
A magnetic resonance imaging uses a fast SE-related multiple slice technique which permits a decreased SAR, a reduced MTC effect, and still offers excellent image contrast. The imaging includes a process of applying to an object placed in a static magnetic field a one excitation RF pulse in synchronization with a pulse of slice-selective magnetic field gradient applied to the object; a process of consecutively applying to the object a plurality of refocusing RF pulses each of which being applied in synchronization with another pulse of slice-selective magnetic field gradient applied to the object; and a process of consecutively acquiring a plurality of spin echoes emanated from the object each with a pulse of phase-encoding magnetic field gradient applied to the object, each of said plurality of spin echoes being emanated responsively to each of said plurality of refocusing RF pulses. A flip angle of one of the refocusing RF pulses is set to a first value which is either equal to or less than 180.degree., said one of the refocusing RF pulses being assigned for phase-encoding at each location in a phase-encoding direction of a central block containing a non-encoding location of a k-space into which the spin echoes are mapped every block. Flip angles of the remaining refocusing RF pulses are set to a second value smaller than the first value.

REFERENCES:
patent: 4914391 (1990-04-01), Leroux
patent: 5050609 (1991-09-01), Balaban et al.
Frahm et al., "Stimulated Echo Imaging", Journal of Magnetic Resonance 64, 81-93 (1985).
Pauly et al., "A k-Space Analysis of Small-Tip-Angle Exciation", Journal of Magnetic Resonance 81, 43-56, 1989.
Hennig et al. "Fast Imaging using Burst Exciation Pulses", 1994.
P.S. Melki and R.V.Mulkern, Magnetization Transfer Effects in Multislice RARE Sequences, Magnetic Resonance in Medicine 24, 189-195 (1992).
J. Hennig, Multiecho Imaging Sequences with Low Refocusing Flip Angles, Journal of Magnetic Resonance 78, pp. 397-407 (1988).

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