Ideal Utilization of Determining Thermoplastic Mask via Tumor Bed Surgical Clip Displacement in Radiotherapy After Breast-preserving Surgery
XU Juan
HAN Wei
LI Pingping
SU Na
LI Yufeng
Abstract：Objective To determine the relationship between radiation displacement and factors such as breast vol-ume and radiation frequency,and to further analyze the effectiveness of thermoplastic film in different application scenari-os.Methods A retrospective review was performed on data collected from 69 female patients undergoing breast-preser-ving surgery and postoperative radiotherapy for breast cancer at author's hospital from September 2022 to June 2024.The effects of breast volume,tumor quadrant,radiotherapy times and body mass index(BMI)on the displacement error of tumor bed surgical clip in radiotherapy after breast-preserving surgery were analyzed.Results Comparing the displace-ment errors of different breast volumes,the Y axis displacement errors of patients with 500 cm3≤ breast volume ≤800 cm3 and breast volume＜500 cm3 were smaller than patients with breast volume＞800 cm3(all P＜0.05);In Z axis,the displacement patients with 500 cm3≤breast volume ≤800 cm3 was smaller than patients with breast volume＜500 cm3 and breast volume＞800 cm3.Comparing the displacement errors in different quadrants of the tumor,there was no sig-nificant difference in the displacement errors between the 4 quadrants of the X axis and the Y axis(all P＞0.05);the dis-placement error in the upper outer quadrant was smaller than that in the other 3 quadrants,and the difference was statisti-cally significant(P＜0.05).Comparing the displacement errors of the patients with different radiotherapy times,the dis-placement errors of the patients with radiotherapy times＞21 were smaller than those of the patients with radiotherapy times ≤21 of the X axis and the Y axis,and the differences were statistically significant(all P＜0.05).The Y axis displacement errors in patients with BMI＜24 kg/m2 was smaller than that in patients with BMI≥24 kg/m2(P＜0.05).Logistic regression analysis showed that the number of radiotherapy was the influencing factor of the displacement errors of the tumor bed surgical clip in the X axis radiotherapy after breast-preserving surgery(P＜0.05).Breast volume,radiotherapy times and BMI were the influencing factors of Y axis displacement error(P＜0.05).Breast volume and radiotherapy quadrant were the influencing factors of Z axis displacement error(P＜0.05).Conclusion Factors such as the number of radiotherapy times,breast volume and BMI have varying degrees of impact on the displacement errors of radiotherapy in different axes.Thermoplastic mask,as a commonly used position fixing tool during radiotherapy,plays an important role in reducing ra-diotherapy displacement errors,improving radiotherapy accuracy and safety.
Keywords：Breast cancerBreast-preserving surgeryRadiotherapyThermoplastic maskTumor bed surgical clipDisplacement errorApplication scenarios
Publication Date：2025-02-28
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：6( 132-137 )