|Table of Contents|

Effects of different fixation methods on positioning error of breast cancer radiotherapy

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

Issue:
2021 03
Page:
507-511
Research Field:
Publishing date:

Info

Title:
Effects of different fixation methods on positioning error of breast cancer radiotherapy
Author(s):
CAO Jingli; GAO Wenchao; QIN Qi; LIN Hongyu; WANG Junliang
Department of Radiotherapy，the Fifth Medical Center of PLA General Hospital, Beijing 100071，China.
Keywords:
breast tumor; radiotherapy; thermoplastic mask; positioning error
PACS:
R737.9
DOI:
DOI：10.3969/j.issn.1672-4992.2021.03.032
Abstract:
Objective：To investigate the application of four different fixation methods for breast cancer radiotherapy positioning，and analyze the positioning accuracy，so as to provide reference for clinical application.Methods：From November 2018 to January 2019，a total of 34 cases of breast cancer radiotherapy patients were selected，which included 20 cases had breast conserving surgery and 14 cases of breast cancer patients after radical surgery(radiotherapy in the supraclavicular region).20 cases of breast cancer patients after breast conserved surgery were divided into group A and group B，A used vacuum pad and head thermoplastic mask fixation，B used breast bracket.14 cases of breast cancer patients after radical surgery were divided into group C and group D，respectively used neck and shoulder thermoplastic mask(C hands side，D hands grasping ears).We can use Philips Bigbore CT to perform positioning scanning，and transfer images to the Varian Ecplipse treatment planning system for reconstruction and plan design.After the first treatment，patients must complete CT scan，so we can register verified image with the planned image，measure the coordinate error of the treatment center，and then use SPSS18.0 statistical software for statistical analysis of the data，then get the positioning error.Results：The positioning errors of group A in the X，Y and Z directions were (1.7±1.9) mm，(2.1±2.9) mm and (2.0±1.2) mm，respectively.The positioning errors of group B in the X，Y and Z directions were (2.8±1.1) mm，(3.7±1.1) mm and (4.8±1.3) mm，respectively.The positioning errors of group C in the X，Y and Z directions were (2.1±1.6) mm，(2.1±1.5) mm and (3.6± 3.1) mm，respectively.The positioning errors of group D in X，Y and Z directions were (1.0± 0.5) mm，(1.9±1.5) mm and (3.6±1.9) mm，respectively.The positioning error of group A in the Y and Z directions was smaller than that of group B(P=0.048，0.038)，and there was no significant difference in the positioning error of group A and group B in the X direction(P>0.05).There was no significant difference in the positioning error between C group and D group in the X，Y and Z directions(P>0.05).Conclusion：Radiotherapy for breast cancer conserving surgery，the vacuum pad and head thermoplastic mask fixation can reduce the positioning error compared with the breast bracket.For breast cancer patients after radical surgery，there is no significant difference in positioning error between the two fixation techniques by neck and shoulder mold，so it is recommended to use the ear grasping method to reduce the dose error caused by the connection between adjacent fields.

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Last Update: 2021-01-02