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Updated: Jul 1, 2026

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Surface-guided analysis of breast shape changes during postoperative radiotherapy by using a functional map

Pierre Galmiche1, Hyewon Seo1, Yvan Pin2

  • 1Laboiratoire ICube, CNRS-University of Strasbourg, Strasbourg, France.

Medical Physics
|June 30, 2026
PubMed
Summary
This summary is machine-generated.

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This study introduces a geometric method to track breast shape changes during radiotherapy, revealing significant inter-fractional deformations up to 10% volume change, crucial for adaptive treatment planning.

Area of Science:

  • Medical Physics
  • Radiotherapy
  • Medical Imaging

Background:

  • Breast shape and volume changes during radiotherapy are poorly understood.
  • These changes impact treatment effectiveness and patient-specific adaptive planning.
  • Accurate characterization of inter-fractional breast deformation is needed.

Purpose of the Study:

  • Develop a geometric approach to analyze inter-fractional breast deformation during radiotherapy.
  • Utilize 3D surface scans acquired during treatment sessions.
  • Enable patient-specific adaptive radiotherapy planning.

Main Methods:

  • Collected 3D surface scans of 22 patients undergoing radiotherapy post-lumpectomy.
  • Adapted functional map framework for nonrigid correspondence computation.
Keywords:
breast shape changespost‐operative radiotherapyshape analysis

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  • Performed intrinsic and extrinsic analyses of breast surface shapes for deformation patterns, displacements, and volume changes.

    • Main Results:

    • Identified deformations in contralateral breast and armpit areas, with positioning shifts.
    • Average displacements in the treated breast were 1-2 mm, increasing by the 25th session.
    • Observed up to 10% volume change, with most cases between 2-5% over treatment.

    Conclusions:

    • A novel geometric approach effectively analyzes breast shape changes using surface data.
    • The functional map framework facilitates specialized breast shape matching and variability analysis.
    • The method reveals significant individual breast changes, supporting quantitative and qualitative deformation analysis for adaptive radiotherapy.