MRI apparatus

Details MRI apparatus MRI apparatus

1996-02-20

1998-03-17

Arana, Louis M.

Electricity: measuring and testing

Particle precession resonance

Using a nuclear resonance spectrometer system

324307, G01V 300

Patent

active

057291390

ABSTRACT:
The present invention relates to an MRI apparatus capable of preventing the quality of an image from being degraded under the influence of eddy currents and residual magnetization caused by a phase encode gradient. While an RF pulse P1 is sent, a phase encode gradient gy(i) is applied to a warp axis and a read gradient rr is applied to a read axis, an NMR signal is received, followed by application of a rewind gradient gyr(i)' to the warp axis. The rewind gradient gyr(i)' is defined as "(a basic component of opposite polarity equal in time integral value to the phase encode gradient gy(i))+(a warp-axis correction component for correcting the influence of eddy currents or residual magnetization caused by the phase encode gradient gy(i))".

REFERENCES:
patent: 5450010 (1995-09-01), Van Der Meulen et al.
patent: 5455512 (1995-10-01), Groen et al.
patent: 5488298 (1996-01-01), Wright et al.
patent: 5508612 (1996-04-01), Kanazawa

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