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Hand-assisted positioning and contact pressure control for motion compensated robotized transcranial magnetic stimulation

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International Journal of Computer Assisted Radiology and Surgery Aims and scope Submit manuscript

Abstract

Purpose

In Transcranial Magnetic Stimulation (TMS), the principle of magnetic induction is used to stimulate the brain non-invasively. Currently, robotic TMS systems are developed to guarantee precise coil placement on the head and in this way achieve the repeatability of stimulation results. However, usability concerns such as the complicated coil positioning are still unsolved for motion compensated robotized TMS. In this paper, we demonstrate the integration of a force-torque control into a robotic TMS system to improve usability, safety, and precision.

Methods

We integrated a force-torque sensor between robot effector and TMS coil. Coil calibration and gravity compensation have been developed. Based on them, we have implemented hand-assisted positioning for easy and fast coil placement. Furthermore, we have enhanced the existing motion compensation algorithms with a contact pressure control.

Results

The positioning time for an experienced user decreased up to 40% with the help of hand-assisted positioning in comparison with not hand-assisted robotized positioning. It also enabled an inexperienced user to use the system safely.

Conclusion

Integration of a force-torque control into the motion compensated robotized TMS system greatly enhances system’s usability, which is a prerequisite for integration in the clinical workflow and clinical acceptance.

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Authors and Affiliations

  1. Institute for Robotics and Cognitive Systems, University of Lübeck, Ratzeburger Allee 160, 23562, Lübeck, Germany

    Lars Richter, Ralf Bruder & Achim Schweikard

  2. Graduate School for Computing in Medicine and Life Sciences, University of Lübeck, 23562, Lübeck, Germany

    Lars Richter

Authors
  1. Lars Richter
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  2. Ralf Bruder
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  3. Achim Schweikard
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Correspondence to Lars Richter.

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Richter, L., Bruder, R. & Schweikard, A. Hand-assisted positioning and contact pressure control for motion compensated robotized transcranial magnetic stimulation. Int J CARS 7, 845–852 (2012). https://doi.org/10.1007/s11548-012-0677-6

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  • DOI: https://doi.org/10.1007/s11548-012-0677-6

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