Electricity: measuring and testing – Particle precession resonance – Using a nuclear resonance spectrometer system
Patent
1998-12-30
2000-12-12
Patidar, Jay
Electricity: measuring and testing
Particle precession resonance
Using a nuclear resonance spectrometer system
324307, 600459, G01V 300
Patent
active
06160397&
ABSTRACT:
Correcting gradients for a phase encoding axis in an MRI imaging system are provided in an FSE pulse sequence to correct phase errors in echo signals, such as due to effects of cross term eddy currents induced by slice select gradients. Correcting gradients to be applied to the logical phase encoding axis are identified in a prescan sequence. An initial correcting gradient is identified for correcting phase errors resulting from an initial slice select gradient pulse. Subsequent, bipolar gradient pulses for the phase encoding axis are then derived from the initial correcting gradient. The prescan technique may be used in conjunction with other prescanning sequences used to determine additional corrections for the FSE sequence. The correcting gradients reduce or eliminate image artifacts resulting from such factors as cross term eddy currents in oblique scans. An averaging sequence may be implemented to reduce the likelihood for influencing the compensation pulse calculation errors. When implemented, the logical axes may be rotated to provide any desired oblique orientation.
REFERENCES:
patent: 5378985 (1995-01-01), Hinks
patent: 6011392 (2000-01-01), Zhou et al.
Hinks Richard Scott
Washburn Sheila S.
Cabou Christian G.
General Electric Company
Patidar Jay
Price Phyllis Y.
Shrivastav Brij B.
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