Evaluation of hybrid depth scanning for carbon-ion radiotherapy

Medical Physics
T InaniwaKoji Noda

Abstract

In radiotherapy with a scanned carbon-ion beam, its Bragg peak is shifted along the depth direction either by inserting the range shifter plates or by changing the beam-extraction energy of a synchrotron. In the former technique (range shifter scanning: RS), the range shifter plates broaden the beam size and produce secondary fragments through nuclear reactions. In the latter technique (active-energy scanning: ES), it may take several seconds to change the beam energy depending on the synchrotron operation cycle, leading to a long treatment time. The authors propose a hybrid depth scan technique (hybrid scanning: HS), where several beam energies are used in conjunction with the range shifter plates for finer range shift. In this study, HS is evaluated from the viewpoints of dose distribution and treatment time. Assuming realistic accelerator and beam-delivery systems, the authors performed computer simulations using GEANT4 Monte Carlo code for beam modeling and a treatment planning system to evaluate HS. Three target volumes with the same dimensions of 60 × 60 × 60 mm(3) were generated at depths of 45, 85, and 125 mm in water phantom, and uniform clinical dose was planned for these targets. The sizes of lateral dose falloff and...Continue Reading

References

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Citations

Dec 11, 2013·Medical Physics·Takuji FurukawaKoji Noda
Feb 9, 2016·Head & Neck·Masashi KotoUNKNOWN Organizing Committee for the Working Group for Head and Neck Cancer
Mar 11, 2016·International Journal of Radiation Oncology, Biology, Physics·Shinichiro MoriTadashi Kamada
Mar 5, 2016·The British Journal of Radiology·Kentaro MikiMasashi Koto
Dec 18, 2013·Radiotherapy and Oncology : Journal of the European Society for Therapeutic Radiology and Oncology·Masashi KotoTadashi Kamada
May 3, 2014·Radiotherapy and Oncology : Journal of the European Society for Therapeutic Radiology and Oncology·Shinichiro MoriShigeo Yasuda
Jan 8, 2015·Medical Physics·S GiordanengoM Donetti
Nov 15, 2012·Journal of Applied Clinical Medical Physics·Shinichiro MoriKoji Noda
May 14, 2014·Physics in Medicine and Biology·F Ammazzalorso, U Jelen
Oct 29, 2020·Radiation Protection Dosimetry·Shinnosuke Matsumoto, Shunsuke Yonai
Mar 30, 2021·Radiation Protection Dosimetry·Shinnosuke Matsumoto, Shunsuke Yonai
Jun 10, 2021·Cancer Science·Hiraku SatoUNKNOWN Working Group for Genitourinary Tumors
Feb 8, 2018·International Journal of Radiation Oncology, Biology, Physics·Nor Shazrina SulaimanUNKNOWN Japan Carbon-Ion Radiation Oncology Study Group

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