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Abstract #4491

Magnetic tracking of ECG sensors for respiratory motion correction

Benjamin Roussel1,2, Joris Pascal3, Jacques Felblinger1,2, and Julien Oster1,2

1Université de Lorraine, Nancy, France, 2U1254, INSERM, Nancy, France, 3FHNW/HLS/IMA, FHNW/HLS/IM2, University of Applied Sciences and Arts Northwestern Switzerland FHNW, Muttenz, Switzerland

Monitoring the respiration motion is a crucial step for motion correction. We propose a magnetic tracking system, using a magnetic sensor and a Helmholtz coil as the magnetic field source. By comparing the sensed magnetic fields with theoretical values under the dipole approximation, we were able to locate sensors placed on a subject’s chest and track their motion during breathing. With a sub-centimeter resolution and the current sources of imprecision being identified, we are confident this method can be a viable solution for accurate motion monitoring in MRI, especially by using the magnetic fields generated by the gradient coils.

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