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Abstract #3066

Magnitude-Weighted Phase Based Edge Detection for Navigator Gated Imaging

Kenichi Kanda1, Yuji Iwadate2, Yoshikazu Ikezaki1

1MR Engineering, GE Healthcare Japan, Hino, Tokyo, Japan; 2MR Applied Science Laboratory, GE Healthcare Japan, Hino, Tokyo

In navigator echo technique, accurate position detection of the diaphragm is essential. The edge detection analysis based on the phase profile of navigator enables the navigator gated imaging even with the saturation effect. However, the phase profile is sometimes unstable in the lung, and wrong position can be detected accordingly. We present a hybrid algorithm utilizing both magnitude and phase information to detect the diaphragm position. Our results show that the edge detection based on the magnitude-weighted phase data can detect the diaphragm position accurately even when the data have a fuzzy magnitude edge or noisy phase in the lung.