In this work, an MRI compatible Fabry-Pérot Interferometry (FPI) based force sensor is designed and fabricated using novel methods, and integrated into an 18-gauge nitinol biopsy needle. The resolution of the FPI based sensor is increased by coating optical fibers with magnesium and titanium thin film. The force sensing needle is tested by in vitro experiments using a prostate phantom and in vivo animal experiments under MRI.
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