Non-Contact Cardiac Gating with Ultra-Wideband Radar Sensors for High Field MRI

Olaf Kosch¹, Florian Thiel¹, Bernd Ittermann¹, Frank Seifert¹

We have developed a contact less approach for the detection of cardiac mechanics by means of ultra-wideband (UWB) radar. and applied it for cardiac gating in high field MR. To extract beneficial information from UWB radar for cardiac MRI the decomposition of respiratory and cardiac displacements is mandatory, since the MRI data have to be unambiguously assigned to the state of the individual respiratory and cardiac cycle. We applied blind-source separation (BSS) based on several time-delayed second order correlation matrices to decompose the UWB signals and extract a pure cardiac component. In this work we present the application of cardio gating based on UWB radar signals simultaneously acquired during a clinical 3T cardio sequence utilizing retrospective image reconstruction.