Quantization error reduction method for phase encode gradient in

Details Quantization error reduction method for phase encode gradient in Quantization error reduction method for phase encode gradient in

1986-07-25

1987-12-15

Levy, Stewart J.

Electricity: measuring and testing

Particle precession resonance

Using a nuclear resonance spectrometer system

324309, G01R 3320

Patent

active

047136154

ABSTRACT:
In an improved NMR imaging method, where three-nominally orthogonal gradient fields are generated, the quantization error of the phase encode gradient is reduced without the necessity of a digital to analog converter of higher bit capacity. This is accomplished in one embodiment by providing a second smaller gradient waveform which is relatively narrow compared to the primary gradient waveform, the ratio of the waveforms being proportional to the improved resolution. The second waveform can occur either before or after the 180.degree. excitation pulse used to produce a spin-echo signal. In another embodiment pulse width modulation is used to vary the area of the phase encode waveform in discrete increments.

REFERENCES:
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patent: 4510448 (1985-04-01), Riedl
patent: 4520315 (1985-05-01), Loeffler et al.
patent: 4585995 (1986-04-01), Flugan
patent: 4591789 (1986-05-01), Glover et al.
patent: 4625170 (1986-11-01), Yamamoto et al.
patent: 4670716 (1987-06-01), Kunz

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