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The effect of photon energy on dose distribution in volumetric-modulated arc therapy planning for head and neck cancer

Published online by Cambridge University Press:  14 May 2020

Trang Hong Thi Nguyen Open the ORCID record for Trang Hong Thi Nguyen [Opens in a new window] ,
Akihiro Takemura Open the ORCID record for Akihiro Takemura [Opens in a new window] ,
Shinichi Ueda ,
Kimiya Noto ,
Hironori Kojima  and
Naoki Isomura
Trang Hong Thi Nguyen
Affiliation:
Division of Health Sciences, Graduate School of Medical Sciences, Kanazawa University, Kanazawa, Japan
Akihiro Takemura*
Affiliation:
Faculty of Health Sciences, Institute of Medical, Pharmaceutical and Health Sciences, Kanazawa University, Kanazawa, Japan
Shinichi Ueda
Affiliation:
Department of Radiological Technology, Kanazawa University Hospital, Kanazawa, Japan
Kimiya Noto
Affiliation:
Department of Radiological Technology, Kanazawa University Hospital, Kanazawa, Japan
Hironori Kojima
Affiliation:
Department of Radiological Technology, Kanazawa University Hospital, Kanazawa, Japan
Naoki Isomura
Affiliation:
Department of Radiological Technology, Kanazawa University Hospital, Kanazawa, Japan
*
Author for correspondence: Akihiro Takemura, Faculty of Health Sciences, Institute of Medical, Pharmaceutical and Health Sciences, Kanazawa University, Kanazawa, Japan. Tel: +81762652538. Fax: +81762344366. E-mail: [email protected]
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Abstract

Aim:

To investigate the effect of different energies on dose distribution in volumetric-modulated arc therapy (VMAT) plans for head and neck cancer.

Materials and methods:

Data from nine patients undergoing VMAT plans using 6 MV, 10 MV and dual-energy X-ray beams with the Pinnacle 3 V 9.10 treatment planning system (Philips Medical System, Fitchburg, WI, USA) were analysed for quality using the conformity index (CI) and homogeneity index (HI) for planning target volume (PTV), and for mean and maximum dose to the organs at risk (OARs): parotid glands, brainstem, spinal cord and optic nerves.

Results:

There were no clear differences in the HIs of the PTV dose among the different plans. The CIs for 10 MV and dual-energy VMAT plans were superior to that of the 6 MV VMAT plan (0·8 ± 0·3, 0·8 ± 0·3, and 0·7 ± 0·2, respectively; p = 0·001). There were no significant differences in mean/maximum dose to the OARs among the three VMAT plans.

Findings:

Compared with the 6 MV VMAT plan, the dual-energy VMAT plan slightly increased the coverage of the PTV with the prescribed dose but did not decrease dose to the OARs.

Keywords

dose distributionhead and neck cancerphoton energyVMAT plan
Type
Original Article
Information
Journal of Radiotherapy in Practice , Volume 20 , Issue 3 , September 2021 , pp. 316 - 320
Copyright
© The Author(s), 2020. Published by Cambridge University Press

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