Phase rotated spoiling for spatial and spectral saturation techn

Details Phase rotated spoiling for spatial and spectral saturation techn Phase rotated spoiling for spatial and spectral saturation techn

1994-11-23

1996-03-19

O'Shea, Sandra L.

Electricity: measuring and testing

Particle precession resonance

Using a nuclear resonance spectrometer system

324309, 324314, G01V 300, G01V 314

Patent

active

055005934

ABSTRACT:
Magnets (12) create a temporally constant magnetic field through an examination region (14). Radio frequency coils (26, 34) and a transmitter (24) transmit radio frequency saturation pulses (52) and the resonance excitation and manipulation pulses of a magnetic resonance imaging sequence (72) into the examination region. Gradient amplifiers (20) and gradient coils (22, 32) create magnetic field gradients across the examination region for spatially focusing the saturation, for spoiling (62, 66, 70) residual transverse magnetization and for frequency and phase encoding in the magnetic resonance imaging sequence. A sequence controller (40) includes a saturation pulse controller (44) for generating the saturation pulse (52) and slice select gradients (58) and a steady state sequence controller (48) for generating the imaging sequence (72). The saturation is spectrally focused by limiting the frequency of the saturation pulse to selected frequencies. The saturation is spatially focused by applying the slice or other spatially limiting gradient pulses concurrently with the radio frequency saturation pulse. A phase shift controller (76) increments the phase of the RF saturation pulse by a preselected phase increment, e.g., 105.degree.. Preferably, the phase shift increment increases linearly in each cyclic repetition, i.e., increases 105.degree. in the first repetition, 210.degree. in the next repetition, 315.degree. in the next repetition, etc. A reconstruction processor (80) reconstructs resonance signals generated during the imaging sequences into an image representation for storage in a memory (82) and display on a video monitor (86).

REFERENCES:
patent: 5055790 (1991-10-01), Siuciak et al.
patent: 5311133 (1994-05-01), Dannels
patent: 5329231 (1994-07-01), Hatta et al.
patent: 5347218 (1994-09-01), Van Yperen
"An Analysis of Fast Imaging Sequences With Steady-State Magnetization Refocusing", Zur, et al., SMRM 1987, pp. 894-895.
"The Application of Steady-State Free Precession (SFP) in 2D-FT MR Imaging", Gyngell, et al., SMRM 1986, p. 666-667.
"Elimination of Transverse Coherences in FLASH MRI", Crawley, et al., Magnetic Resonance in Medicine, 8, 248-260 (1988).

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