title: Piezoelectrically Actuated Robotic System for MRI-Guided Prostate Percutaneous Therapy.
abstract: This paper presents a fully-actuated robotic system for percutaneous prostate therapy under continuously acquired live magnetic resonance imaging (MRI) guidance. The system is composed of modular hardware and software to support the surgical workflow of intra-operative MRI-guided surgical procedures. We present the development of a 6-degree-of-freedom (DOF) needle placement robot for transperineal prostate interventions. The robot consists of a 3-DOF needle driver module and a 3-DOF Cartesian motion module. The needle driver provides needle cannula translation and rotation (2-DOF) and stylet translation (1-DOF). A custom robot controller consisting of multiple piezoelectric motor drivers provides precision closed-loop control of piezoelectric motors and enables simultaneous robot motion and MR imaging. The developed modular robot control interface software performs image-based registration, kinematics calculation, and exchanges robot commands and coordinates between the navigation software and the robot controller with a new implementation of the open network communication protocol OpenIGTLink. Comprehensive compatibility of the robot is evaluated inside a 3-Tesla MRI scanner using standard imaging sequences and the signal-to-noise ratio (SNR) loss is limited to 15%. The image deterioration due to the present and motion of robot demonstrates unobservable image interference. Twenty-five targeted needle placements inside gelatin phantoms utilizing an 18-gauge ceramic needle demonstrated 0.87 mm root mean square (RMS) error in 3D Euclidean distance based on MRI volume segmentation of the image-guided robotic needle placement procedure.
authors.affiliation: Philips Research North America, were with the Automation and Interventional Medicine (AIM) Robotics Lab, Department of Mechanical Engineering, Worcester Polytechnic Institute.
authors.forename: Hao
authors.initials: H
authors.lastname: Su
authors.affiliation: Automation and Interventional Medicine (AIM) Robotics Lab, Department of Mechanical Engineering, Worcester Polytechnic Institute, 100 Institute Road, Worcester, MA 01609, USA.
authors.forename: Weijian
authors.initials: W
authors.lastname: Shang
authors.affiliation: Philips Research North America, were with the Automation and Interventional Medicine (AIM) Robotics Lab, Department of Mechanical Engineering, Worcester Polytechnic Institute.
authors.forename: Gregory
authors.initials: G
authors.lastname: Cole
authors.affiliation: Automation and Interventional Medicine (AIM) Robotics Lab, Department of Mechanical Engineering, Worcester Polytechnic Institute, 100 Institute Road, Worcester, MA 01609, USA.
authors.forename: Gang
authors.initials: G
authors.lastname: Li
authors.affiliation: Automation and Interventional Medicine (AIM) Robotics Lab, Department of Mechanical Engineering, Worcester Polytechnic Institute, 100 Institute Road, Worcester, MA 01609, USA.
authors.forename: Kevin
authors.initials: K
authors.lastname: Harrington
authors.affiliation: Automation and Interventional Medicine (AIM) Robotics Lab, Department of Mechanical Engineering, Worcester Polytechnic Institute, 100 Institute Road, Worcester, MA 01609, USA.
authors.forename: Alexander
authors.initials: A
authors.lastname: Camilo
authors.affiliation: National Center for Image Guided Therapy (NCIGT), Brigham and Women's Hospital, Department of Radiology, Harvard Medical School, Boston, MA, 02115 USA.
authors.forename: Junichi
authors.initials: J
authors.lastname: Tokuda
authors.affiliation: National Center for Image Guided Therapy (NCIGT), Brigham and Women's Hospital, Department of Radiology, Harvard Medical School, Boston, MA, 02115 USA.
authors.forename: Clare M
authors.initials: CM
authors.lastname: Tempany
authors.affiliation: National Center for Image Guided Therapy (NCIGT), Brigham and Women's Hospital, Department of Radiology, Harvard Medical School, Boston, MA, 02115 USA.
authors.forename: Nobuhiko
authors.initials: N
authors.lastname: Hata
authors.affiliation: Automation and Interventional Medicine (AIM) Robotics Lab, Department of Mechanical Engineering, Worcester Polytechnic Institute, 100 Institute Road, Worcester, MA 01609, USA ( gfischer@wpi.edu ).
authors.forename: Gregory S
authors.initials: GS
authors.lastname: Fischer
keywords: Biopsy; Brachytherapy; Image-guided Therapy; MRI-Guided Robotics; Piezoelectric Actuation