Dosimetric comparison of two irradiation modes after radical mastectomy for breast cancer
- VernacularTitle:乳腺癌根治术后2种照射模式的剂量学比较研究
- Author:
Xiaoqing HUANG
1
;
Yuanyuan LIU
1
;
Liang YAN
1
;
Shuping YI
1
Author Information
- Publication Type:Journal Article
- Keywords: breast neoplasms; radiotherapy,intensity-modulated; radiotherapy dosage; volumetric modulated arc therapy; intensity modulated radiation therapy
- From: Tianjin Medical Journal 2025;53(11):1204-1207
- CountryChina
- Language:Chinese
- Abstract: Objective To compare the dosimetric differences between volumetric modulated arc therapy(VMAT)and intensity modulated radiation therapy(IMRT)in the irradiation of chest wall and upper and lower clavicle regions after radical mastectomy for breast cancer.Methods A total of 100 patients who were scheduled to receive radiotherapy after radical mastectomy were included and selected as research subjects.Patients were divided into the VMAT group and the IMRT group by random number table method,with 50 cases in each group.The target dose parameters,exposure dose of organs at risk,monitor unit(MU)and treatment time were compared between the two groups.Results There were no statistical differences in V95 and V110 between the VMAT group and the IMRT group(P＞0.05).The D2%in the VMAT group was lower than that of the IMRT group,while D98%and D50%were higher in the VMAT group than those in the IMRT group(P＜0.05).Target area uniformity and target area conformity were better in the VMAT group than those in the IMRT group(P＜0.05).There were no significant differences in mean cardiac dose(Dmean)and ipsilateral lung V5 and V10 between the VMAT group and the IMRT group(P＞0.05).The heart V20 and V30,contralateral lung Dmean,maximum spinal cord dose(Dmax),contralateral breast Dmean,ipsilateral lung Dmean,V20,V30 and mean MU were lower in the VMAT group than those in the IMRT group,and the treatment time was shorter than that in the IMRT group(P＜0.05).Conclusion In the irradiation treatment of chest wall and upper and lower clavicle regions after radical mastectomy,VMAT demonstrates superior dosimetric characteristics and higher treatment efficiency compared with IMRT,particularly in terms of target area uniformity,target area conformity and exposure doses to organs at risk.
