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Surface-guided radiotherapy overview: Technical aspects and clinical applications.

J Darréon1, C Massabeau2, C Geffroy3

  • 1Medical Physics Department, institut Paoli-Calmettes, Marseille, France.

Cancer Radiotherapie : Journal De La Societe Francaise De Radiotherapie Oncologique
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PubMed
Summary

Surface-guided radiotherapy uses optical cameras for continuous patient surface monitoring, aiding precise positioning and tracking during treatment sessions. This technology offers advantages over traditional imaging, particularly for breast cancer radiotherapy.

Keywords:
BreastIGRTPelvisRadiothérapie guidée par la surfaceRadiothérapie guidée par l’imageSGRTSein

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Area of Science:

  • Medical physics
  • Radiotherapy technology
  • Image-guided therapy

Background:

  • Traditional radiotherapy patient positioning relies on ionizing imaging (kV or MV).
  • Emerging surface-guided radiotherapy (SGRT) offers an alternative positioning and monitoring method.
  • SGRT utilizes continuous 3D surface acquisition via optical cameras.

Purpose of the Study:

  • To introduce and describe the principles and applications of surface-guided radiotherapy.
  • To highlight the benefits of SGRT in patient positioning and treatment monitoring.
  • To discuss specific clinical advantages of SGRT, such as for breast cancer treatment.

Main Methods:

  • Continuous 3D surface acquisition using multiple optical cameras.
  • Comparison of the acquired patient surface with a reference surface from planning scans.
  • Real-time monitoring of patient position, anatomical changes, and shifts.

Main Results:

  • SGRT provides aid in patient positioning, potentially eliminating the need for tattoos.
  • Enables continuous patient monitoring throughout the radiotherapy session.
  • Demonstrates significant benefits for specific treatment sites, notably breast radiotherapy, where bone registration is suboptimal.

Conclusions:

  • Surface-guided radiotherapy offers a valuable tool for precise patient positioning and real-time monitoring.
  • The system is particularly advantageous for treatments where traditional methods are less effective, such as breast radiotherapy.
  • SGRT facilitates advanced treatment techniques like deep inspiration breath hold and can be applied to various anatomical sites.