Performance assessment of a programmable five degrees-of-freedom motion platform for quality assurance of motion management techniques in radiotherapy

  • Chen-Yu Huang
  • Paul Keall
  • Adam Rice
  • Emma Colvill
  • Jin Aun Ng
  • Jeremy T. Booth
Scientific Paper
  • 117 Downloads

Abstract

Inter-fraction and intra-fraction motion management methods are increasingly applied clinically and require the development of advanced motion platforms to facilitate testing and quality assurance program development. The aim of this study was to assess the performance of a 5 degrees-of-freedom (DoF) programmable motion platform HexaMotion (ScandiDos, Uppsala, Sweden) towards clinically observed tumor motion range, velocity, acceleration and the accuracy requirements of SABR prescribed in AAPM Task Group 142. Performance specifications for the motion platform were derived from literature regarding the motion characteristics of prostate and lung tumor targets required for real time motion management. The performance of the programmable motion platform was evaluated against (1) maximum range, velocity and acceleration (5 DoF), (2) static position accuracy (5 DoF) and (3) dynamic position accuracy using patient-derived prostate and lung tumor motion traces (3 DoF). Translational motion accuracy was compared against electromagnetic transponder measurements. Rotation was benchmarked with a digital inclinometer. The static accuracy and reproducibility for translation and rotation was <0.1 mm or <0.1°, respectively. The accuracy of reproducing dynamic patient motion was <0.3 mm. The motion platform’s range met the need to reproduce clinically relevant translation and rotation ranges and its accuracy met the TG 142 requirements for SABR. The range, velocity and acceleration of the motion platform are sufficient to reproduce lung and prostate tumor motion for motion management. Programmable motion platforms are valuable tools in the investigation, quality assurance and commissioning of motion management systems in radiation oncology.

Keywords

Tumor motion 5 Degrees-of-freedom motion platform Quality assurance Motion management 

Notes

Funding

This work was supported by a Cancer Australia Grant 1085360 and the Australian Fellowship from the Australian National Health and Medical Research Council. No commercial support was received for this study.

Compliance with ethical standards

Conflict of interest

The authors declare that they have no conflicts of interest.

Ethical approval

This article does not contain any studies with human participants or animals performed by any of the authors.

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Copyright information

© Australasian College of Physical Scientists and Engineers in Medicine 2017

Authors and Affiliations

  • Chen-Yu Huang
    • 1
  • Paul Keall
    • 1
  • Adam Rice
    • 2
  • Emma Colvill
    • 1
    • 2
  • Jin Aun Ng
    • 1
  • Jeremy T. Booth
    • 2
    • 3
  1. 1.School of MedicineUniversity of SydneySydneyAustralia
  2. 2.Northern Sydney Cancer CentreRoyal North Shore HospitalSydneyAustralia
  3. 3.School of PhysicsUniversity of SydneySydneyAustralia

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