Magnetic resonance imaging apparatus having a resonant circuit f

Details Magnetic resonance imaging apparatus having a resonant circuit f Magnetic resonance imaging apparatus having a resonant circuit f

1990-12-03

1994-03-29

Wieder, Kenneth A.

Electricity: measuring and testing

Particle precession resonance

Spectrometer components

324322, 324300, G01R 3320

Patent

active

052988635

ABSTRACT:
A gradient coil for generating a periodically changing read-out gradient in a magnetic resonance imaging apparatus is operated in a series resonant circuit having a capacitor. One of the elements of the series resonant circuit is charged before the beginning of each read-out gradient. The gradient coil can be charged with current, or the capacitor can be charged with voltage. Such operation either avoids or significantly shortens the transient effect which occurs after excitation of the nuclear spins. The use of a series resonant circuit instead of a parallel resonant circuit significantly reduces the voltage load on the gradient amplifier, so that the gradient amplifier can be constructed simpler and more inexpensively.

REFERENCES:
patent: 3579111 (1971-05-01), Johannessen et al.
patent: 3708760 (1973-01-01), Farkas
patent: 3763478 (1973-10-01), Yoshizawa
patent: 4628264 (1986-12-01), Rzedzian
patent: 4668904 (1987-05-01), Kupiainen
patent: 4678996 (1987-07-01), Haacke et al.
patent: 4752735 (1988-06-01), Onodera et al.
patent: 4808928 (1989-02-01), Frahm et al.
patent: 4890063 (1989-12-01), Haragashira
patent: 4901020 (1990-02-01), Ladebeck et al.
patent: 4916395 (1990-04-01), Usui
patent: 4993075 (1991-02-01), Sekihara et al.
patent: 5017817 (1991-05-01), Mueller et al.
patent: 5079503 (1992-01-01), Siebold et al.
Kim et al, "Whole Body NMR Spiral Echo Planar Imaging Using Resonant Gradient Coil", Book of Abstracts, Soc. of Magn. Res. in Medicine, 7th Annual meeting and Exhibition p. 1013 (1988) (no month).
"Instrumentation fir NMR Spin-Warp Imaging" Johnson et al., J. Phys. E: Sci. Instrum., vol. 15, pp. 74-79 (1982) (no month).
"A Whole Body NMR Imaging Machine" Hutchison et al. J. Phys. E: Sci. Instrum., vol. 13, pp. 947-955 (1980).
"MR Angiography with Gradient Motion Refocusing" Laub et al. J. Comput. Assist Tomogr. vol. 12, No. 3 pp. 377-382 (1988) (no month).

Affiliated with

Also associated with

Rating

Magnetic resonance imaging apparatus having a resonant circuit f does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Magnetic resonance imaging apparatus having a resonant circuit f, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Magnetic resonance imaging apparatus having a resonant circuit f will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-794901