Magnetic resonance imaging (MRI) apparatus and method for...

Electricity: measuring and testing – Particle precession resonance – Using a nuclear resonance spectrometer system

Reexamination Certificate

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C324S309000

Reexamination Certificate

active

08080997

ABSTRACT:
An MRI apparatus and method reduces eddy currents generated by changing gradient magnetic fields used to image an object. Positioning image data from a pilot imaging mode is used to set reference imaging conditions for a subsequent actual diagnostic imaging mode used to acquire diagnostic image data. An eddy current stimulus index is calculated for a gradient magnetic field polarity successively (i.e., iteratively) renewed (i.e., changed) by renewal of imaging conditions and phase-encoding direction. Diagnostic image data is generated during an actual diagnostic imaging mode based on a gradient magnetic field polarity and phase-encoding direction that provides the lowest eddy current stimulus index value, thus using an optimum set of imaging conditions.

REFERENCES:
patent: 7365543 (2008-04-01), Yui et al.
patent: 7613496 (2009-11-01), Miyazaki et al.
patent: 7825660 (2010-11-01), Yui et al.
patent: 2008/0161678 (2008-07-01), Miyazaki et al.
patent: 2009/0212772 (2009-08-01), Ookawa
patent: 2002-85372 (2002-03-01), None
patent: 2004-329613 (2004-11-01), None
Examiner's judgement is based on the two abstracts provided in English.

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