Stereotactic body radiation therapy for non-small cell lung cancer using the non-coplanar radiation of Cyberknife and Varian linac

Article type: Research Article

Authors: Shao, Wencheng^{a; c; *} | Chen, Ziyin^{b; *} | Bai, Yanchun^b | Xu, Bingchen^d | Xu, Lili^b | Zhao, Qiushuang^b | Wang, Yang^e | Tang, Xiaobin^a

Affiliations: [a] Department of Nuclear Science and Technology, Nanjing University of Aeronautics and Astronautics, Nanjing, P. R. China | [b] Department of Radiation Therapy, The First Affiliated Hospital of Harbin Medical University, Harbin, P. R. China | [c] Department of Radiation Physics, Harbin Medical University Cancer Hospital, Harbin, P. R. China | [d] Department of Radiation Therapy, Jilin Central Hospital, Jilin, P. R. China | [e] Accelerator Treatment Site, Harbin Chest Hospital, Harbin, P. R. China

Correspondence: [*] Corresponding authors. Wencheng Shao, Department of Nuclear Science and Technology, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China. Tel.: +86 0451 86298513; Fax: +86 025 52112906 80407; E-mail: wenchengshao@outlook.com and Ziyin Chen, Department of Radiation Therapy, the First Affiliated Hospital of Harbin Medical University, Harbin 150001, China. Tel.: +86 0451 53643929; E-mail: chenziyin1020@outlook.com.

Abstract: PURPOSE:This study aims to evaluate the planned dose of stereotactic body radiation therapy (SBRT) for treating early peripheral non-small cell lung cancer (NSCLC) using the non-coplanar radiation from Cyberknife and Varian linac. Moreover, this study investigates whether Cyberknife and Varian linac are qualified for non-coplanar radiation SBRT for treating early peripheral NSCLC, and which one is better for protecting organs at risk (OARs). METHODS:Retrospective analysis was performed based on the Cyberknife radiation treatment plans (RTPs) and Varian Eclipse RTPs of 10 patients diagnosed with early peripheral NSCLC. The dose distributions in the target and OARs were compared between the RTPs of Cyberknife and Varian Eclipse using Mim medical imaging software. RESULTS:For PTV, no significant difference in D98 and D95 between the Cyberknife and Eclipse was observed (t = –0.35, –1.67, P > 0.05). The homogeneity indexes (HIs) of Cyberknife plans are higher (t = 71.86, P < 0.05) than those of Eclipse plans. The V10, V15, V20, V25, V30 and Dmean of the lung with NSCLC and the V20 of the whole lung for Cyberknife were less than those for Eclipse (t = –4.73, –5.62, –7.75, –6.38, –6.89, –3.14, –7.09, respectively, P < 0.05). Cyberknife plans have smaller spinal cord Dmax, trachea Dmax, heart Dmax, chest wall Dmax (t = –2.49, –2.57, –3.71, –3.56, respectively, P < 0.05) and esophagus Dmax (t = –1.95, P > 0.05) than Varian Eclipse plans. CONCLUSION:To fulfill SBRT by non-coplanar radiation, Cyberknife is recommended for the institutions equipped with Cyberknife, while Varian linac can be applied for the institutions that have not adopted Cyberknife in clinical radiotherapy yet.

Keywords: NSCLC, SBRT, Cyberknife, Varian linac, non-coplanar radiation

DOI: 10.3233/XST-210867

Journal: Journal of X-Ray Science and Technology, vol. 29, no. 4, pp. 635-643, 2021