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Abstract #1168

Simultaneous detection of cardiac, respiratory, and rigid body head motion using the scattering of a parallel transmit RF coil at 7T

Daniel Papp1, Sven Jaeschke2, Sebastian W. Rieger1,3, Stuart Clare1, and Aaron T. Hess4

1Wellcome Centre for Integrative Neuroimaging, FMRIB, Nuffield Department of Clinical Neurosciences, University of Oxford, OXFORD, United Kingdom, 2University of Oxford Centre for Magnetic Resonance Research, University of Oxford, OXFORD, United Kingdom, 3Oxford Centre for Human Brain Activity, Wellcome Centre for Integrative Neuroimaging, Department of Psychiatry, University of Oxford, Oxford, United Kingdom, 4British Heart Foundation Centre of Research Excellence, Department of Cardiovascular Medicine, Oxford, OXFORD, United Kingdom

Cardiac pulsation, respiration and rigid-body head motion induce changes in relative tissue conductivity. These changes can be detected via the scattering of a parallel transmit RF coil array at 7T, by monitoring the forward and reflected power of each channel, with a 5ms pulse. The time series of the scattering data can be used to detect cardiac and respiratory motion, as well as predict head position using training data. We show that detected heart and respiration rates match those recorded with independent monitoring, and head position may be predicted with reasonable precision, at little extra time cost.

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