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Related Experiment Video

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Patient posture correction and alignment using mixed reality visualization and the HoloLens 2.

Perry B Johnson1,2, Amanda Jackson3, Mohammad Saki2

  • 1Department of Radiation Oncology, University of Florida College of Medicine, Gainesville, Florida, USA.

Medical Physics
|November 15, 2021
PubMed
Summary

This study introduces a mixed reality (MixR) system for radiotherapy patient alignment, achieving accurate posture correction. The MixR system offers a cost-effective and efficient method for patient setup without using ionizing radiation.

Keywords:
HoloLens 2SGRTaugmented realitymixed reality

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Area of Science:

  • Medical Physics
  • Radiotherapy
  • Mixed Reality (MixR)

Background:

  • Mixed Reality (MixR) is an emerging technology with potential applications in medicine.
  • Accurate patient positioning is crucial for effective radiotherapy treatment.
  • Current patient alignment methods can be time-consuming and may involve ionizing radiation.

Purpose of the Study:

  • To develop and test a radiotherapy system using mixed reality (MixR) for patient posture correction and alignment.
  • To introduce MixR concepts and technology to a medical physics audience.
  • To evaluate the accuracy and efficiency of the MixR system for patient setup.

Main Methods:

  • Developed a MixR application for an optical-see-through head-mounted display (HoloLens 2).
  • Utilized marker-based tracking for hologram initialization and marker-less tracking for free navigation.
  • Tested the system with rigid (pelvis) and nonrigid (female mannequin) anthropomorphic phantoms, quantifying accuracy with CBCT and CT.

Main Results:

  • Achieved rigid registration accuracy of 3.0 ± 1.5 mm.
  • The MixR system demonstrated superior performance in nonrigid alignment compared to traditional methods.
  • Identified lateral direction as having the most variability in user alignment.

Conclusions:

  • Mixed Reality (MixR) visualization offers significant advantages for patient setup in radiation oncology.
  • The developed system provides an efficient, portable, and cost-effective mechanism for posture reproduction without ionizing radiation.
  • Preliminary accuracy indicates clinical viability, supporting further development and testing.