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Abstract #0551

Rapid Method of Mapping Eddy Current Fields

Andrew J. Wheaton1, Wayne R. Dannels1

1Toshiba Medical Research Institute USA, Mayfield, OH, United States

The purpose of this investigation is to develop a rapid method of volumetric field mapping for the purpose of measuring linear and higher-order eddy current-induced gradient fields. The method includes a novel pulse sequence using a grid tag module to sensitize the magnetization to eddy-induced moment accumulation. Any conventional sequence can be used for detection thus enabling fast acquisition. Results are shown on a commercial scanner demonstrating eddy current maps with higher order spherical harmonic terms acquired in less than 20 seconds.

Keywords

accumulation address advances amplitude applications arctangent arrows axis bandpass bore calibrated calibration chosen clinical clockwise commonly compensate compensation complex component components compression consisting constants correct correction cross decay delay dependence depending described despite detected detection develop diagram diffusion dilation directly distribution domain duration eddy effectively efficiency either emphasis enabled equation experiment falling fast field fields fine generate generated generating gradient gray grid harmonics hence include initial integration king like linear lobe local locally magnet maier mapping maps measured measuring medical mineral model modifying modulation module moment moments necessary negligible noise offsets optimized patent pattern period persist polarity positioned positive preceding previous previously processed processing produced produces proper pulses ramp rapid rapidly read readout related remaining repeating residual resolution respectively rotation rotations scanner self sensitive sensitization separated separately shielded simple since sinusoidal slow sources space spacing spatial sphere spin stimulus terms trade trapezoidal type typically utilizes volumetric warp warping white zero zeroth