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Concept for quantifying the dose from image guided radiotherapy.

Uwe Schneider1,2, Roger Hälg3,4, Jürgen Besserer5,6

  • 1Institute of Physics, Science Faculty, University of Zürich, Zürich, Switzerland. uwe.schneider@uzh.ch.

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|September 18, 2015
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Summary
This summary is machine-generated.

Image-guided radiotherapy (IGRT) involves radiation doses that can be categorized based on accepted therapy dose variations. This new concept quantifies IGRT imaging doses within the ALARA framework.

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Area of Science:

  • Medical Physics
  • Radiotherapy
  • Radiation Oncology

Background:

  • Radiographic image guidance is standard in radiotherapy for patient positioning.
  • IGRT imaging adds radiation dose to therapeutic radiation, posing a challenge for dose management.
  • Existing dose minimization strategies for diagnostic imaging are insufficient for IGRT.

Purpose of the Study:

  • To develop a concept for quantifying image-guided radiotherapy (IGRT) dose.
  • To enable comparison of imaging dose with accepted therapeutic dose variations.
  • To manage IGRT dose within the ALARA (As Low As Reasonably Achievable) convention.

Main Methods:

  • Proposed three dose categories (I, II, III) based on imaging dose relative to therapy dose variations.
  • Assumed that acceptable therapy beam variations can apply to imaging dose.
  • Measured doses for various treatment techniques and categorized imaging devices accordingly.

Main Results:

  • Planar kV-kV imaging and MV fan beam CT are Category I.
  • kV-MV imaging and MV-MV imaging are Category I/II and Category II, respectively.
  • CBCT protocols vary (Category I/II), while live imaging is Category III for conventional and Category II for stereotactic treatments.

Conclusions:

  • Radiotherapy imaging doses can be categorized relative to accepted therapy dose variations.
  • This categorization provides a framework for quantifying daily IGRT doses.
  • The concept aligns with the ALARA principle for managing radiation exposure.