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Abstract #3949

3D motion quantification based on the temporal evolution of the noise covariance matrix of a receive array

Robin J.M. Navest1, Anna Andreychenko1, Jan J.W. Lagendijk1, Baudouin Denis de Senneville1,2, and Cornelis A.T. van den Berg1

1Department of Radiotherapy, Center for Image Sciences, University Medical Center Utrecht, Utrecht, Netherlands, 2IMB, UMR 5251 CNRS/University of Bordeaux, Bordeaux, France

Motion quantification is essential for successful MR imaging and MRI guided radiotherapy of mobile organs. Currently, 3D MRI is too slow to quantify organ displacements and a motion model could alternatively be used for tracking and/or motion compensation. A motion model trained on MRI data and driven by the noise covariance matrix (NCM) of a receive array is proposed to quantify internal anatomy motion. Passive thermal noise measurements have a high temporal resolution (~10ms) and do not interfere with or rely on MR signal. Abdominal organ displacement can be accurately estimated in 3D, through the NCM of the receive array.

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