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Comment
. 2018 Apr 13;13(1):66.
doi: 10.1186/s13014-018-1010-5.

Response to "in regard to "Tran A, Zhang J, Woods K, Yu V, Nguyen D, Gustafson G, Rosen L, Sheng K. Treatment planning comparison of IMPT, VMAT and 4π radiotherapy for prostate cases""

Ke Sheng  1
Affiliations
Comment

Response to "in regard to "Tran A, Zhang J, Woods K, Yu V, Nguyen D, Gustafson G, Rosen L, Sheng K. Treatment planning comparison of IMPT, VMAT and 4π radiotherapy for prostate cases""

Ke Sheng. Radiat Oncol. .

Abstract

In regard to our recently published paper entitled "Treatment planning comparison of IMPT, VMAT and 4π radiotherapy for prostate cases", a question was raised whether "4π" was used appropriately to describe the non-coplanar planning and delivery space. In this letter, the term use is explained from both theoretical and practical perspectives. It is concluded that the self-explanatory term provides a flexible description of non-coplanar radiotherapy with beam orientation optimization. Confusions with this term can be avoided by understanding the evolving and machine/patient specific nature of 4π planning.

Keywords: 4π; Non-coplanar radiotherapy; Optimization; Treatment planning.

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Conflict of interest statement

Ethics approval and consent to participate

The study is approved by UCLA Internal Review Board (IRB) #12–001882.

Consent for publication

The letter shows the surfaces of a human subject (the author), who agrees to the publication of the letter.

Competing interests

The author declares that he has no competing interests.

Publisher’s Note

Springer Nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations.

Figures

Fig. 1
Fig. 1
a Couch/gantry combination to achieve the entire 4π solid angle. The selected beams are denoted B1-B14. The isolines denote the minimal distances in meter between the source and the target to achieve those angles. The collision model only considered the patient surface and gantry without the couch in this case. b The corresponding patient centric view
Fig. 2
Fig. 2
Accessible non-coplanar beam geometry for a left lung target based on the actual machine model and a 3D laser scanned human surface shown in (a). b The non-coplanar surface that can be accessed by the source when up to 120 cm source-to-isocenter distances are used by enabling additional couch shifts. c The non-coplanar surface that can be accessed by the X-ray source for treatment limited to 100 cm isocentric set up. The surface only accounts for a point source and that the effective coverage will be larger due to the typical 40 cm field-of-view
See this image and copyright information in PMC

Comment on

References

    1. Yu VY, Tran A, Nguyen D, et al. The development and verification of a highly accurate collision prediction model for automated noncoplanar plan delivery. Med Phys. 2015;42:6457–6467. doi: 10.1118/1.4932631. - DOI - PMC - PubMed
    1. Baumeyer J, Vieyres P, Miossec S, et al. Robotic co-manipulation with 6 DoF admittance control: application to patient positioning in proton-therapy. 2015 Ieee international workshop on advanced robotics and its social impacts (Arso) 2015.