Title: Design and control of 3-DOF needle positioner for MRI-guided laser ablation of liver tumours

Authors: Enrico Franco; Marco Aurisicchio; Mike Ristic

Addresses: Mechanical Engineering Department, Imperial College London, London, UK ' Mechanical Engineering Department, Imperial College London, London, UK ' Mechanical Engineering Department, Imperial College London, London, UK

Abstract: This article presents the design and control of a pneumatic needle positioner for laser ablation of liver tumours under guidance by magnetic resonance imaging (MRI). The prototype was developed to provide accurate point-to-point remote positioning of a needle guide inside an MR scanner with the aim of evaluating the potential advantages over the manual procedure. In order to minimise alterations to the MR environment, the system employs plastic pneumatic actuators and 9 m long supply lines connecting with the control hardware located outside the magnet room. An improved sliding mode control (SMC) scheme was designed for the position control of the device. Wireless micro-coil fiducials are used for automatic registration in the reference frame of the MR scanner. The MRI-compatibility and the accuracy of the prototype are demonstrated with experiments in the MR scanner.

Keywords: medical robotics; pneumatic systems; magnetic resonance imaging; MRI; sliding mode control; SMC; needle positioner design; 3-DOF needle positioner; MRI-guided laser ablation; liver tumours; pneumatic needle positioner; point-to-point remote positioning; position control; robot control.

DOI: 10.1504/IJBBR.2015.079373

International Journal of Biomechatronics and Biomedical Robotics, 2015 Vol.3 No.3, pp.145 - 158

Received: 22 Jan 2015
Accepted: 18 Feb 2016

Published online: 23 Sep 2016 *

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