Abstract
Biopsy needles with embedded force sensors can eliminate the needle deflection and the needle targeting failure risks during MRI guided biopsy procedures. Fabry-Pérot interferometry (FPI) based sensors are small, compact and immune to electromagnetic and RF interferences, and therefore they are suitable for needle guidance under MRI. In this work, an FPI based fiber optic force sensor design and its integration to an 18-gauge MRI compatible biopsy needle are presented. The custom designed FPI sensor provides a force measurement range up to 13 N with a resolution of 0.1 N through benchtop experiments. The MRI compatibility of the sensor was evaluated using a commercially available prostate phantom under MRI.
Highlights
Magnetic Resonance Imaging (MRI) has a great potential to replace the existing imaging modalities during interventional procedures such as biopsies thanks to its superior soft tissue contrast and ionizing radiation-free nature
Applied axial force measurement during needle guidance can be performed by Fabry-Pérot Interferometry (FPI) based fiber optic force sensors which can be integrated to the biopsy needle tip
Transmitted light from the beam splitter is coupled into a single mode optical fiber with a cladding diameter of 125 μm, and transferred to the FPI force sensor located at the biopsy needle tip
Summary
Magnetic Resonance Imaging (MRI) has a great potential to replace the existing imaging modalities during interventional procedures such as biopsies thanks to its superior soft tissue contrast and ionizing radiation-free nature. A real-time force measurement capability from the needle distal tip during the biopsy operation can allow physicians to appreciate small variations in the mechanical properties of the tissues along the needle insertion trajectory. This valuable information can be used to improve needle targeting and analyze the tissue-needle interaction. It is not possible to use conventional electrical force sensors for MRI guided interventions, because of potential electromagnetic interferences during imaging. Applied axial force measurement during needle guidance can be performed by Fabry-Pérot Interferometry (FPI) based fiber optic force sensors which can be integrated to the biopsy needle tip
Sign-in/Register to view highlights & summary 
Published Version (
Free)
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call