Method and apparatus for reduction of nyquist ghosts in...

Details Method and apparatus for reduction of nyquist ghosts in... Method and apparatus for reduction of nyquist ghosts in...

2008-07-22

2008-07-22

Shrivastav, Brij B. (Department: 2859)

Electricity: measuring and testing

Particle precession resonance

Using a nuclear resonance spectrometer system

Reexamination Certificate

active

11510178

ABSTRACT:
In a method and MRT apparatus for reduction of Nyquist ghosts in medical magnetic resonance imaging given the application of EPI sequences of one or more progression curves with regard to one or more characterizing quantities of the EPI echo, is determined dependent on the echo number of a readout gradient pulse train defined by pulse shape, pulse amplitude and pulse duration, an EPI measurement is implemented with a readout gradient pulse train, composed of alternating positive and negative amplitudes with under which alternating positive and negative echoes and respectively readout, and a phase coding gradient, so a phase-coded data set is acquired, the phase-coded data set is corrected on the basis of the progression curves, and is Fourier-transformed the corrected data set, to obtain an artifact-reduced (with regard to the Nyquist ghosts) image data set.

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“A Method of Generalized Projections (MGP) Ghost Correction Algorithm for Interleaved EPI,” Lee et al, IEEE Trans. on Med. Imaging, vol. 23, No. 7 (Jul. 2004) pp. 839-848.

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