|Table of Contents|

The 3D printed headrest improves the repeatability of the position of intensity-modulated radiotherapy for nasopharyngeal carcinoma

Journal Of Modern Oncology[ISSN:1672-4992/CN:61-1415/R]

Issue:
2023 08
Page:
1485-1489
Research Field:
Publishing date:

Info

Title:
The 3D printed headrest improves the repeatability of the position of intensity-modulated radiotherapy for nasopharyngeal carcinoma
Author(s):
YAN Yuying1; YE Rong1; YU Luxin1; TANG Xiaoyan1; HUANG Fasheng1; YANG Chengfan2
1.Cancer Center；2.3D Printing Center，Sichuan Academy of Medical Sciences·Sichuan Provincial People's Hospital,Sichuan Chengdu 610072,China.
Keywords:
3D printed headrest; nasopharyngeal carcinoma; intensity modulated radiotherapy; setup error; residual translation error; residual rotation error
PACS:
R739.63
DOI:
10.3969/j.issn.1672-4992.2023.08.018
Abstract:
Objective:To analyze the effect of 3D printed headrest on the reproducibility of intensity modulated radiation therapy (IMRT) for nasopharyngeal carcinoma (NPC).Methods:54 patients with NPC were divided into experimental group (27 cases) and control group (27 cases).The experimental group was fixed with 3D printed headrest combined with head-neck-shoulder thermoplastic membrane,while the control group was fixed with foam soft headrest,carbon fiber pad and head-neck-shoulder thermoplastic membrane.The setup errors in the three directions of anterior-posterior(AP),superior-inferior(SI),left-right（LR）were retrospectively compared between the two groups,and the residual translation errors and residual rotation errors in the 4 regions of interest of basis cranial,cervical 2,cervical 4 and cervical 7 were analyzed by registration.Results:The number of patients needing repeated positioning before the first treatment in the experimental group was significantly less than that in the control group with statistical significance (P＜0.05).The setup errors of AP and SI directions in the experimental group were significantly smaller than those in the control group(P＜0.05),and there was no significant differencein the LR direction between the two groups (P＞0.05).The residual translation errors of cranial base and cervical 2 in the AP,SI and LR directions and cervical 4 and cervical 7 in the AP,LR directions in the experimental group were significantly smaller than those in the control group(P＜0.05).There was no significant difference in the residual translation errors in the SI direction of cervical 4 and cervical 7 compared with the control group (P＞0.05).The residual rotation errors of cranial base,cervical 2,cervical 4 and cervical 7 in the sagittal,transverse,and coronal sections in the experimental group were significantly lower than those in the control group (P＜0.05).In the experimental group,the frequency of absolute value of residual translation error>2 mm in the AP direction of cranial base and the AP,SI and LR directions of cervical 2,cervical 4 and cervical 7 was significantly lower than that in the control group (P＜0.05).The frequency of absolute value of residual translation error>2 mm in the SI and LR directions of cranial base was not significantly different from that in the experimental group and in the control group (P＞0.05).In the experimental group,the frequency of absolute value of residual rotation errors>2° in the sagittal,transverse,and coronal sections of cranial base,cervical 2,cervical 4 and cervical 7 was significantly lower than that in the control group (P＜0.05).Conclusion:The 3D printed headrest combined with head-neck-shoulder membrane fixed position can reduce the setup error,residual translation error and residual rotation error in intensity modulated radiotherapy（IMRT）for nasopharyngeal carcinoma（NPC）.it can effectively improve the accuracy of IMRT and decrease the side effects of normal tissue and improve the target therapeutic effect and the quality of life of patients.

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