Magnetic resonance imaging method and device for reducing image

Details Magnetic resonance imaging method and device for reducing image Magnetic resonance imaging method and device for reducing image

1994-05-31

1995-05-09

Arana, Louis

Electricity: measuring and testing

Particle precession resonance

Using a nuclear resonance spectrometer system

324307, G01V 300

Patent

active

054143594

ABSTRACT:
A magnetic resonance imaging method is known for the reduction of image errors in magnetic resonance images which are caused by quantization errors in a DAC (26) for generating a phase encoding gradient waveform in an MRI measuring sequence (ms1, ms2) for generating magnetic resonance signals (S(t), S.sub.1 (t)). The known method has the drawback that inter alia the effect of differential non-linearity of the DAC (26) on the image errors is not taken into account. The invention proposes an MRI method in which such image errors are also reduced. To achieve this, prior to and/or during application of the measuring sequences (ms1, ms2), deviations of phase encoding gradient areas relative to desired areas are determined and image data in an image matrix derived from the resonance signals are corrected on the basis of said deviations.

REFERENCES:
patent: 4647858 (1987-03-01), Bottomley
patent: 4928063 (1990-05-01), Lampman et al.
patent: 5027071 (1991-06-01), Hardy et al.
patent: 5157330 (1992-10-01), Kaufman et al.
Journal of Physics E. Scientific Instruments, Apr. (1987), No. 4, Bristol, U.K. pp. 416-419.
Journal of Physics E. Scientific Instruments, vol. 19, No. 10, Oct. 1986, pp. 871-875.

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