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Sweeping-beam technique with electrons for large treatment areas as total skin irradiation

Dosimetric and technical aspects of a modified Stanford technique

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Abstract

Purpose

Total skin electron beam therapy (TSEBT) is still a technical and therapeutic challenge today. Thus, we developed TSEBT using a sweeping-beam technique.

Methods

For treatment delivery, a linear accelerator Versa HD (ELEKTA, Stockholm, Sweden) with high-dose-rate electrons (HDRE) was used with a dose rate of 9000 MU/min. Dosimetry quality assurance was performed by multiple measurements with film dosimetry, 2D array, and Roos chamber.

Results

Clinical experience shows that treatment durations of 75 to 90 min are usual for the Stanford technique without using HDRE. With this new sweeping-beam irradiation technique, the total treatment time of a daily fraction could be reduced to 20 min while keeping over- and underdosing low. The treatment area is about 60 cm × 200 cm and the dose distribution is uniform within 2% and 5% in vertical and horizontal directions, respectively. Initially, the electron energy of 6 MeV is reduced to 3.2 MeV by 1‑cm polymethylmethacrylat (PMMA) scatter and the irradiation conditions of a source–surface distance (SSD) of 350 cm. The photon contamination drops to under 1%.

Conclusion

These results show that the mean dose to total skin varies between 1.3 and 1.8 Gy. The sweeping-beam technique with electrons has a homogeneous dose distribution in connection with a short treatment time.

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Authors and Affiliations

  1. Department of Radiation Oncology, Klinikum Chemnitz gGmbH, Bürgerstraße 2, 09113, Chemnitz, Germany

    Michael Schöpe, Jacob Sahlmann, Kathleen Lorenz, Anne Findeisen, Thomas Barthel & Gunther Klautke

Authors
  1. Michael Schöpe
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  2. Jacob Sahlmann
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  3. Kathleen Lorenz
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  4. Anne Findeisen
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  5. Thomas Barthel
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Corresponding author

Correspondence to Michael Schöpe.

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Conflict of interest

M. Schöpe, J. Sahlmann, K. Lorenz, A. Findeisen, T. Barthel, and G. Klautke declare that they have no competing interests.

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Schöpe, M., Sahlmann, J., Lorenz, K. et al. Sweeping-beam technique with electrons for large treatment areas as total skin irradiation. Strahlenther Onkol 198, 47–55 (2022). https://doi.org/10.1007/s00066-021-01859-1

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  • DOI: https://doi.org/10.1007/s00066-021-01859-1

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