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Abstract #2849

RF Excitation Using Time Interleaved Acquisition of Modes (TIAMO) to Address B1 Inhomogeneity in Highfield MRI

Stephan Orzada1,2, Stefan Maderwald1,2, Benedikt Poser1,3, Andreas K. Bitz1,2, Harald H. Quick1,2, Mark E. Ladd1,2

1Erwin L. Hahn Institute for Magnetic Resonance Imaging, Essen, NRW, Germany; 2Department for Radiology and Neuroradiology, University Hospital Essen, Essen, NRW, Germany; 3Donders Institute for Brain, Cognition and Behaviour, Centre for Cognitive Neuroimaging, Radboud University Nijmegen, Nijmegen, Netherlands

Signal dropouts in high and ultra-high field MRI pose a substantial problem. Several approaches including transmit SENSE and RF shimming have been proposed. Here we propose a new imaging scheme to tackle this challenge. Using TIAMO, two or more inhomogeneous images acquired using different RF-transmit modes are combined to one homogeneous image. The cost in time for multiple acquisitions can be partially compensated by using the different acquisitions to generate virtual receive channels in a parallel imaging reconstruction. A mathematical theory is developed, and the results of phantom studies as well as first 7T in vivo abdominal imaging are presented.