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Title: Feasibility evaluation of a new irradiation technique: three-dimensional unicursal irradiation with the Vero4DRT (MHI-TM2000).
Authors: Mizowaki, Takashi  kyouindb  KAKEN_id  orcid (unconfirmed)
Takayama, Kenji  kyouindb  KAKEN_id
Nagano, Kazuo
Miyabe, Yuki  kyouindb  KAKEN_id
Matsuo, Yukinori  kyouindb  KAKEN_id  orcid (unconfirmed)
Kaneko, Shuji
Kokubo, Masaki
Hiraoka, Masahiro  KAKEN_id
Author's alias: 溝脇, 尚志
Keywords: three-dimensional unicursal irradiation
dynamic conformal arc irradiation
image-guided radiotherapy
new irradiation technique
dynamic wave arc irradiation
Issue Date: 1-Mar-2013
Publisher: Oxford University Press
Journal title: Journal of radiation research
Volume: 54
Issue: 2
Start page: 330
End page: 336
Abstract: The Vero4DRT (MHI-TM2000) is a newly designed unique image-guided radiotherapy system consisting of an O-ring gantry. This system can realize a new irradiation technique in which both the gantry head and O-ring continuously and simultaneously rotate around the inner circumference of the O-ring and the vertical axis of the O-ring, respectively, during irradiation. This technique creates three-dimensional (3D) rotational dynamic conformal arc irradiation, which we term '3D unicursal irradiation'. The aim of this study was to present the concept and to estimate feasibility and potential advantages of the new irradiation technique. Collision maps were developed for the technique and a 3D unicursal plan was experimentally created in reference to the collision map for a pancreatic cancer case. Thereafter, dosimetric comparisons among the 3D unicursal, a two-dimensionally rotational dynamic conformal arc irradiation (2D-DCART), and an intensity-modulated radiation therapy (IMRT) plan were conducted. Dose volume data of the 3D unicursal plan were comparable or improved compared to those of the 2D-DCART and IMRT plans with respect to both the target and the organs at risk. The expected monitor unit (MU) number for the 3D unicursal plan was only 7% higher and 22.1% lower than the MUs for the 2D-DCART plan and IMRT plan, respectively. It is expected that the 3D unicursal irradiation technique has potential advantages in both treatment time and dose distribution, which should be validated under various conditions with a future version of the Vero4DRT fully implemented the function.
Rights: © The Author 2012. Published by Oxford University Press on behalf of The Japan Radiation Research Society and Japanese Society for Therapeutic Radiology and Oncology.
This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (, which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited
DOI(Published Version): 10.1093/jrr/rrs076
PubMed ID: 22923744
Appears in Collections:Journal Articles

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