|Table of Contents|

Optimization exploration of polyurethane foam combined with head-neck-shoulder mask immobilization in nasopharyngeal carcinoma radiotherapy

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

Issue:
2024 21
Page:
4139-4142
Research Field:
Publishing date:

Info

Title:
Optimization exploration of polyurethane foam combined with head-neck-shoulder mask immobilization in nasopharyngeal carcinoma radiotherapy
Author(s):
ZHOU Dan1; 2; 3; ZHANG Zhenyu4; GUAN Xiyin2; 3; 5; YOU Dan1; 2; 3; 6; LIANG Hongjiao4; XIA Tian1; 2; 3
Keywords:
polyurethane foam; head-neck-shoulder mask; nasopharyngeal carcinoma; CBCT; set-up errors
PACS:
R739.6
DOI:
10.3969/j.issn.1672-4992.2024.21.022
Abstract:
Objective:To discuss the possibility of optimizing the immobilization of polyurethane foam combined head-neck-shoulder mask in nasopharyngeal carcinoma radiotherapy.Methods:20 patients with primary nasopharyngeal carcinoma requiring irradiation of cervical lymph nodes were randomly selected and divided into 2 groups of 10 patients each.Patients in group A were immobilized by general headrest+polyurethane foam+head-neck-shoulder mask.Patients in group B were immobilized by polyurethane foam+head-neck-shoulder mask.CBCT scans were performed before the first 3 radiotherapy sessions and once a week thereafter.The position verification centered on the skull base after scanning served as the data basis for IGRT.For patients with head and neck set-up errors exceeding 3 mm,repositioned and CBCT scanned again for treatment.Using the CBCT images from each initial scan,offline registration was used to obtain the set-up errors in the X（lateral）,Y（longitudinal）,and Z（vertical） directions with the head and neck as the center,which were used as the data for this study.Results:Set-up errors in the X,Y,and Z directions of head and neck in group A were(0.12±0.10)cm & (0.17±0.13)cm,(0.17±0.14)cm & (0.19±0.16)cm,and (0.18±0.15)cm & (0.22±0.16)cm,and the differences were all statistically significant(P<0.05).Set-up errors in the X,Y,and Z directions of head in group A and B were (0.12±0.10)cm & (0.15±0.16)cm,(0.17±0.14)cm & (0.17±0.16)cm,and (0.18±0.15)cm & (0.22±0.16)cm,and none of the differences were statistically significant(P＞0.05).Set-up errors in the X,Y,and Z directions of neck in group A and B were (0.17±0.13)cm & (0.25±0.21)cm,(0.19±0.16)cm & (0.22±0.16)cm,and (0.22±0.16)cm & (0.22±0.16)cm.The difference in the X direction was statistically significant(P<0.05),and the differences in the Y and Z directions were not statistically significant(P>0.05).Conclusion:The use of general headrest+polyurethane foam+head-neck-shoulder mask immobilization system for nasopharyngeal carcinoma radiotherapy patients improved the positional reproducibility of neck,but failed to solve the problem of greater error in the neck compared with the head.

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Last Update: 2024-09-30