Radioactive seed Implantation
Dosimetric evaluation of 125I seed implantation assisted by an optical navigation system and a 3D-printing template in the treatment of recurrent head and neck cancers
Deng Xiuwen, Ji Zhe, Jiang Yuliang, Sun Haitao, Guo Fuxin, Fan Jinghong, Li Weiyan, Wang Junjie
Published 2021-01-25
Cite as Chin J Radiol Med Prot, 2021, 41(1): 3-8. DOI: 10.3760/cma.j.issn.0254-5098.2021.01.002
Abstract
ObjectiveTo verify the accuracy and feasibility of radioactive 125I seed implantation assisted by an optical navigation system and a 3D-printing non-coplanar template in the treatment of recurrent head and neck cancers.
MethodsA total of 12 patients with recurrent head and neck cancer treated with radioactive 125I seed implantation assisted by an optical navigation system and 3D-printing non-coplanar template were enrolled from Dec 2018 to Dec 2019.The pre-plan and post-implant implantation needle number and implanted seed number were recorded.Meanwhile, their dosimetric parameters were compared, including D90, minimum peripheral dose (MPD), V100, V150, V200, conformity index (CI), external index (EI), and the homogeneity index (HI) of the target volume.
ResultsThe median lesion volume was 31.5 cm3, the median number of seeds was 61.5, and the median prescription dose was 130 Gy.The means of the pre-plan D90, MPD, V100, V150 and V200 were 134.2, 64.6, 93.3, 75.3 and 39.3 Gy, respectively, while those of post-implant D90, MPD, V100, V150, and V200 were 146.7, 68.94, 97.47, 80.40 and 48.30 Gy, respectively, with no statistically significant difference (P>0.05). Meanwhile, there was no statistically significant difference between the pre-plan and post-implantation needle number, implanted seed number, CI, HI, and EI (P>0.05). In terms of postoperative dose quality assessment, eight cases were rated excellent (66.6%) and four cases were rated good (33.3%).
ConclusionsRadioactive 125I seed implantation assisted by an optical navigation system and 3D-printing non-coplanar template can be accurately performed in the treatment of recurrent head and neck cancer, with good consistency between pre-plan and post-implant dosimetric parameters and thus of prospective potential in clinical application.
Key words:
Optical navigation system; 3D-printing template; Radioactive seed implantation; Dosimetry; Recurrent head and neck cancer
Contributor Information
Deng Xiuwen
Department of Radiation Oncology, Peking University Third Hospital, Beijing 100191, China
Ji Zhe
Department of Radiation Oncology, Peking University Third Hospital, Beijing 100191, China
Jiang Yuliang
Department of Radiation Oncology, Peking University Third Hospital, Beijing 100191, China
Sun Haitao
Department of Radiation Oncology, Peking University Third Hospital, Beijing 100191, China
Guo Fuxin
Department of Radiation Oncology, Peking University Third Hospital, Beijing 100191, China
Fan Jinghong
Department of Radiation Oncology, Peking University Third Hospital, Beijing 100191, China
Li Weiyan
Department of Radiation Oncology, Peking University Third Hospital, Beijing 100191, China
Wang Junjie
Department of Radiation Oncology, Peking University Third Hospital, Beijing 100191, China