TY - GEN
T1 - FBG-Based Position Estimation of Highly Deformable Continuum Manipulators
T2 - 2019 International Symposium on Medical Robotics, ISMR 2019
AU - Sefati, Shahriar
AU - Hegeman, Rachel
AU - Alambeigi, Farshid
AU - Iordachita, Iulian
AU - Armand, Mehran
N1 - Funding Information:
*Research supported by NIH/NIBIB grant R01EB016703 and Johns Hopkins internal funds.
Publisher Copyright:
© 2019 IEEE.
PY - 2019/5/8
Y1 - 2019/5/8
N2 - Conventional shape sensing techniques using Fiber Bragg Grating (FBG) involve finding the curvature at discrete FBG active areas and integrating curvature over the length of the continuum dexterous manipulator (CDM) for tip position estimation (TPE). However, due to limited number of sensing locations and many geometrical assumptions, these methods are prone to large error propagation especially when the CDM undergoes large deflections. In this paper, we study the complications of using the conventional TPE methods that are dependent on sensor model and propose a new data-driven method that overcomes these challenges. The proposed method consists of a regression model that takes FBG wavelength raw data as input and directly estimates the CDM's tip position. This model is pre-operatively (off-line) trained on position information from optical trackers/cameras (as the ground truth) and it intra-operatively (on-line) estimates CDM tip position using only the FBG wavelength data. The method's performance is evaluated on a CDM developed for orthopedic applications, and the results are compared to conventional model-dependent methods during large deflection bendings. Mean absolute TPE error (and standard deviation) of 1.52 (0.67) mm and 0.11 (0.1) mm with maximum absolute errors of 3.63 mm and 0.62 mm for the conventional and the proposed data-driven techniques were obtained, respectively. These results demonstrate a significant out-performance of the proposed data-driven approach versus the conventional estimation technique.
AB - Conventional shape sensing techniques using Fiber Bragg Grating (FBG) involve finding the curvature at discrete FBG active areas and integrating curvature over the length of the continuum dexterous manipulator (CDM) for tip position estimation (TPE). However, due to limited number of sensing locations and many geometrical assumptions, these methods are prone to large error propagation especially when the CDM undergoes large deflections. In this paper, we study the complications of using the conventional TPE methods that are dependent on sensor model and propose a new data-driven method that overcomes these challenges. The proposed method consists of a regression model that takes FBG wavelength raw data as input and directly estimates the CDM's tip position. This model is pre-operatively (off-line) trained on position information from optical trackers/cameras (as the ground truth) and it intra-operatively (on-line) estimates CDM tip position using only the FBG wavelength data. The method's performance is evaluated on a CDM developed for orthopedic applications, and the results are compared to conventional model-dependent methods during large deflection bendings. Mean absolute TPE error (and standard deviation) of 1.52 (0.67) mm and 0.11 (0.1) mm with maximum absolute errors of 3.63 mm and 0.62 mm for the conventional and the proposed data-driven techniques were obtained, respectively. These results demonstrate a significant out-performance of the proposed data-driven approach versus the conventional estimation technique.
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U2 - 10.1109/ISMR.2019.8710179
DO - 10.1109/ISMR.2019.8710179
M3 - Conference contribution
AN - SCOPUS:85066304181
T3 - 2019 International Symposium on Medical Robotics, ISMR 2019
BT - 2019 International Symposium on Medical Robotics, ISMR 2019
PB - Institute of Electrical and Electronics Engineers Inc.
Y2 - 3 April 2019 through 5 April 2019
ER -