Correction of artifacts caused by maxwell terms in slice offset

Details Correction of artifacts caused by maxwell terms in slice offset Correction of artifacts caused by maxwell terms in slice offset

1999-03-09

2000-05-16

Oda, Christine K.

Electricity: measuring and testing

Particle precession resonance

Using a nuclear resonance spectrometer system

324307, G01V 300

Patent

active

06064205&

ABSTRACT:
Two methods are disclosed to remove the image artifacts produced by Maxwell terms arising from the imaging gradients in an echo planar imaging pulse sequence. In the first method, the frequency and phase errors caused by the Maxwell terms are calculated on an individual slice basis and subsequently compensated during data acquisition by dynamically adjusting the receiver frequency and phase. In the second method, two linear phase errors, one in the readout direction and the other in the phase-encoding direction, both of which arise from the Maxwell terms, are calculated on an individual-slice basis. These errors are compensated for in the k-space data after data acquisition.

REFERENCES:
patent: 5541513 (1996-07-01), Maier et al.
patent: 5689186 (1997-11-01), Maier et al.
patent: 5869965 (1999-02-01), Du et al.
patent: 5923168 (1999-07-01), Zhou et al.
patent: 5926022 (1999-07-01), Slavin et al.

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