Accurate needle guidance is essential for a number of magnetic resonance imaging (MRI)-guided percutaneous procedures, such as radiofrequency ablation (RFA) of metastatic liver tumors. A promising technology to obtain real-time tracking of the shape and tip of a needle is by using high-frequency (up to 20 kHz) fiber Bragg grating (FBG) sensors embedded in optical fibers, which are insensitive to external magnetic fields. We fabricated an MRI-compatible needle designed for percutaneous procedures with a series of FBG sensors which would be tracked in an image-guidance system, allowing to display the needle shape within a navigation image. A series of phantom experiments demonstrated needle tip tracking errors of 1.05 ± 0.08 mm for a needle deflection up to 16.82 mm on a ground-truth model and showed nearly similar accuracy to electromagnetic (EM) tracking (i.e., 0.89 ± 0.09 mm). We demonstrated feasibility of the FBG-based tracking system for MRI-guided interventions with differences under 1 mm between tracking systems. This study establishes the needle tracking accuracy of FBG needle tracking for image-guided procedures.
Assessment of the Accuracy of Optical Shape Sensing for Needle Tracking Interventions
Manuscript received August 25, 2016; final manuscript received February 19, 2017; published online June 27, 2017. Assoc. Editor: Chris Rylander.
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Mandal, K. K., Parent, F., Kashyap, R., Martel, S., and Kadoury, S. (June 27, 2017). "Assessment of the Accuracy of Optical Shape Sensing for Needle Tracking Interventions." ASME. J. Med. Devices. September 2017; 11(3): 034504. https://doi.org/10.1115/1.4036338
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