RF Energy Harvesting System for Autonomous Respiratory Sensor in MRI

Megdouda Benamara, Asma Bakkali, T. Gómez, Camille Raynard,Christophe Vilmen,Pierre Jomin, Amira Trabelsi, Djamel Berrahou,Marc Dubois, Yann Le Fur,Frank Kober,David Bendahan,Emmanuel Bergeret,Matthieu Egels,Stefan Enoch,Redha Abdeddaïm

Proceedings on CD-ROM - International Society for Magnetic Resonance in Medicine Scientific Meeting and Exhibition/Proceedings of the International Society for Magnetic Resonance in Medicine, Scientific Meeting and Exhibition（2023）

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摘要

The energy harvesting system was developed for preclinical 4.7 T MRI scanners. The system is composed of a commercial birdcage coil tuned and matched at 200.1 MHz, a harvesting coil and an RF-DC rectifier. The collected energy was used to power a respiratory pressure sensor. The efficiency of the harvesting system was optimized as function of the angular positioning of the harvesting coil in the birdcage. The experiments were carried out with a water phantom and a mouse in vivo. A peak voltage of 1.5V was harvested for 45V input voltage and delivered to a load of 350 Ω.

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