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Abstract #4280

Multiecho Water-Fat Separation with Navigated Free-Breathing 3D Spoiled Gradient-Recalled Echo Sequence

Yuji Iwadate1, Anja C.S. Brau2, Yoshihiro Tomoda3, Kenji Asano3, Hiroyuki Kabasawa1

1Global Applied Science Laboratory, GE Healthcare Japan, Hino, Tokyo, Japan; 2Global Applied Science Laboratory, GE Healthcare, Munich, DE, Germany; 3MR Engineering, GE Healthcare Japan, Hino, Tokyo, Japan

Multiecho water-fat separation with multifrequency fat spectrum modeling (IDEAL IQ) provides accurate estimates of fat fraction. Liver imaging is suitable for this technique, since fat is the hallmark feature of nonalcoholic fatty liver disease. However, respiratory motion often causes artifacts in liver imaging. We developed respiratory gated IDEAL IQ with navigator echo for free-breathing image acquisition. A navigator is inserted after imaging sequence and used for data acceptance/rejection. Navigator did not corrupt fat fraction calculation, and enabled free-breathing data acquisition with minimum motion related artifacts. This technique may be useful for patients who cannot hold their breath.