Enhancement of accuracy in shape sensing of surgical needles using optical frequency domain reflectometry in optical fibers

Abstract

Abstract:We demonstrate a novel approach to enhance the precision of surgical needle shape tracking based on distributed strain sensing using optical frequency domain reflectometry (OFDR). The precision enhancement is provided by using optical fibers with high scattering properties. Shape tracking of surgical tools using strain sensing properties of optical fibers has seen increased attention in recent years. Most of the investigations made in this field use fiber Bragg gratings (FBG), which can be used as discrete or quasi-distributed strain sensors. By using a truly distributed sensing approach (OFDR), preliminary results show that the attainable accuracy is comparable to accuracies reported in the literature using FBG sensors for tracking applications (~1mm). We propose a technique that enhanced our accuracy by 47% using UV exposed fibers, which have higher light scattering compared to un-exposed standard single mode fibers. Improving the experimental setup will enhance the accuracy provided by shape tracking using OFDR and will contribute significantly to clinical applications. Symposium, 2000 IEEE, 2000, pp. 1601-1604. 6. N. D. Inc, (2016, 15 Janvier 2016. Medical Aurora -Medical.Available: http://www.ndigital.com/medical/products/aurora/ 7. T. Bien, M. Li, Z. Salah, and G. Rose, "Electromagnetic tracking system with reduced distortion using quadratic excitation," Int. J. CARS 9(2), 323-332 (2014 387-398 (2014).

Fiber Bragg Grating (FBG) Sensors in a High-Scattering Optical Fiber Doped with MgO Nanoparticles for Polarization-Dependent Temperature Sensing

“…As previously outlined in [22], the MgO-NP fiber induces a beat length of polarization that has a higher frequency than a standard SMF, with polarization switching every few centimeters. This effect is common with the other methods proposed for enhancing the Rayleigh backscattering of the fiber [13][14][15]. Thus, in this section we investigate the polarization-sensitive behavior of the FBG, by separating the S/P polarizations into the analysis.…”

“…Yan et al [13] reported a method based on rapid pulses with a fs laser (300 nJ at 250 kHz repetition rate), increasing the scattering level of a SMF by up to 45 dB. Parent et al [14] have obtained similar results, with a scattering increment of 37 dB, by means of exposure to intense ultraviolet light; this method has also been used to generate random gratings [15]. More recently, Beisenova et al [16] have obtained a 36.5 dB scattering increment by using a MgO-nanoparticle-doped (MgO-NP) fiber as sensing medium.…”

“…The possibility to increase the scattering of a fiber is intriguing in distributed sensing, particularly using optical backscatter reflectometry (OBR) [18], whereas the analyzer detects the distributed Rayleigh scattering backreflection occurring in each region of the fiber. In such system, by increasing the Rayleigh scattering a larger signal at the analyzer can be obtained [13][14][15][16][17], over 3-4 orders of magnitude larger when properly tuning scattering properties.…”

Simultaneous position and displacement sensing using two fibre Bragg grating sensors

“…Shape sensors have been widely used in various fields ranging from civil 1 and aerospace 2 to medical applications. 3 Several methods for shape sensing have been reported over the years. Optical fibre sensors have been used to measure deflection as well as for reconstruction of the shape.…”

Design, Measurement and Shape Reconstruction of Soft Surgical Actuator Based on Fiber Bragg Gratings

“…Due to the curvature data being discrete and obtained from the FBG sensors, the curvature is serialized continuously through the linear interpolation and the fitted algorithm; then the geometrical structure of the soft actuator can be reconstructed. By using the idea of differential calculus, a line with fixed length can be divided into several uniform sections, and the length of these sections expressed as L, namely O 1 O 2 = O 2 O 3 = L, and then become some arcs with the length of L when the microstructure is bending, and the center angle of the circular arc is determined by the length L and the curvature C. Assuming that the coordinate of O 2 is (0, 0), the coordinate of O 3 can be calculated as (sinθ 2 /C 2 , (1 − cosθ 2 /C 2 )), from the length L and curvature C, the θ 2 is equal to L*C 2 ; thus this algorithm can be applied for 3D shape reconstruction of the soft actuator [23][24][25][26][27][28][29].…”