Feasibility Evaluation of a New Irradiation Technique: Three-dimensional Unicursal Irradiation with the Vero4DRT (MHI-TM2000)

Overview

Journal J Radiat Res

Publisher Oxford University Press

Specialties Environmental Health
Oncology
Radiology

Date 2012 Aug 28

PMID 22923744

Citations 8

Authors

Takashi Mizowaki

Kenji Takayama

Kazuo Nagano

Yuki Miyabe

Yukinori Matsuo

Shuji Kaneko

Masaki Kokubo

Masahiro Hiraoka

Affiliations

Soon will be listed here.

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.

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Single-isocenter volumetric-modulated Dynamic WaveArc therapy for two brain metastases.

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