The feasibility and efficacy of new SBRT technique HyperArc for recurrent nasopharyngeal carcinoma: noncoplanar cone-based robotic system vs. noncoplanar high-definition MLC based Linac system

doi:10.1016/j.meddos.2020.10.007

CNU IR > Pharmacy and Science > Dept. of Pharmacy > Periodical Articles > Item 310902800/34433

Please use this identifier to cite or link to this item: https://ir.cnu.edu.tw/handle/310902800/34433

Title:	The feasibility and efficacy of new SBRT technique HyperArc for recurrent nasopharyngeal carcinoma: noncoplanar cone-based robotic system vs. noncoplanar high-definition MLC based Linac system
Authors:	Ho, Hsiu-Wen Yang, Ching-Chieh Lin, Hsiu-Man Chen, Hsiao-Yun Huang, Chun-Chiao Wang, Shih-Chang Lin, Yu-Wei
Contributors:	Chi Mei Med Ctr, Dept Radiat Oncol Chia Nan Univ Pharm & Sci, Dept Pharm Chia Nan Univ Pharm & Sci, Dept Hlth & Nutr
Keywords:	Recurrent nasopharyngeal cancer Stereotactic body radiation therapy HyperArc CyberKnife Nasopharyngeal cancer Homogeneous and inhomogeneous delivery
Date:	2021
Issue Date:	2023-11-11 11:52:31 (UTC+8)
Publisher:	ELSEVIER SCIENCE INC
Abstract:	The purpose of this study was to evaluate the feasibility and efficacy of HyperArc (HA) for recurrent nasopharyngeal cancer (NPC) by comparing it with the CyberKnife system (CK). Fifteen patients with recurrent nasopharyngeal cancer who were treated using the noncoplanar cone-based robotic CK system were enrolled. CK was delivered with a median dose of 37.5 Gy in 5 fractions. The delivered CK treatment plans were the sources for the corresponding homogeneous HA (HA-H) and inhomogeneous HA (HA-IH) plans. The HA-H plans were generated to meet the corresponding treatment plan criteria for the CK plans. The HA-IH plans were designed to emulate the corresponding inhomogeneous CK isodose distributions. These three SBRT treatment plans were compared with target coverage, sparing of organs at risk (OARs), and dose distribution metrics. The HA-H and HA-IH plans consistently exhibited CT V and PT V coverage levels similar or better to those of the CK plans but significantly reduced the dose to OARs. Using the HA techniques (both HA-H and HA-IH plans), the mean maximal doses to the spinal cord, brainstem, optic nerves, and optic chiasm were reduced by approximately 60%, compared to the CK plans. The high dose spillage, conformity, and homogeneity indices of the HA-H plans were significantly better than those of the CK plans. The HA-IH plans showed faster dose falloff and similar conformity of the HA-H plans and dose heterogeneity of the CK plans. Here we demonstrated the HA treatment plan system for recurrent NPC is feasible, either homogeneous or inhomogeneous delivery. Excellent sparing of OARs and dosimetric distribution and very efficient delivery make HA an attractive SBRT technique for recurrent NPC treatment. ? 2020 American Association of Medical Dosimetrists. Published by Elsevier Inc. All rights reserved.
Relation:	MED DOSIM, v.46, n.2, pp.164-170
Appears in Collections:	[Dept. of Pharmacy] Periodical Articles

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