Surgery – Diagnostic testing – Detecting nuclear – electromagnetic – or ultrasonic radiation
Reexamination Certificate
2002-10-15
2008-08-26
Casler, Brian L. (Department: 3737)
Surgery
Diagnostic testing
Detecting nuclear, electromagnetic, or ultrasonic radiation
C600S407000
Reexamination Certificate
active
07418286
ABSTRACT:
In a magnetic resonance imaging apparatus, in order to suppress generation of artifacts when a linear or non-linear phase error is generated during sampling of the echo signals, a first sequence for acquiring a plurality of echo signals by radiating a radio-frequency magnetic field pulse to an object to be examined, performing phase encoding, while alternating the polarity of a readout gradient magnetic field, and a second sequence for acquiring a plurality of echo signals by repeatedly applying the readout gradient magnetic field while reversing its polarity to that in the first sequence at the same phase encoding direction are performed. Signal processing means performs complex addition of the echo signals having the same phase encoding amount respectively obtained in the first sequence and the second sequence, and reconstructs an image.
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“Simultaneous Correction of Ghost and Geometric Distortion Artifacts in EPI Using a Multiecho Reference Scan” Vincent J. Schmithorst et al., IEEE Transactions on Medical Imaging, vol. 20, No. 6, Jun. 2001, pp. 535-539.
Kumai Hideki
Takeuchi Hiroyuki
Casler Brian L.
Cooper & Dunham LLP
Hitachi Medical Corporation
Kish James
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