Dosimetric comparison of two dose expansion methods in intensity modulated radiotherapy for breast cancer

Radiation Oncology

Research

Guanhua Deng¹  Aimin Li²  Ran Tang²  Yue Luo²  Qing Xiao²  Yingjing Li²  Yufeng Wang²  Luosheng Zhang² 

[1] Guangdong 999 Brain Hospital, 510510, Guangzhou, China;Integrated Hospital of Traditional Chinese Medicine, Southern Medical University, No.13 Shiliugang Road, 510315, Guangzhou, Guangdong, China;Cancer Center, Southern Medical University, 510315, Guangzhou, China;

关键词: Breast cancer;    Intensity modulated radiotherapy;    Dose intensity expansion;    Chest wall;   

DOI  :  10.1186/s13014-023-02217-4

 received in 2022-11-30, accepted in 2023-01-31,  发布年份 2023

来源: Springer

【 摘 要 】

BackgroundTo explore the dosimetric difference between IMRT-VB plan based on the establishment of external expansion structure and virtual bolus (VB) and IMRT-SF based on the skin flash (SF) tool of the Eclipse treatment planning system in postoperative chest wall target intensity modulation radiotherapy plan of breast cancer.MethodsTwenty patients with breast cancer were randomly selected as subjects to develop IMRT-VB plan based on virtual bolus and IMRT-SF plan based on skin flash tool of Eclipse treatment planning system. The planning target volume, monitor unit (MU) of every single treatment and the dosimetric parameters of organ at risk (OARs) were recorded. Paired t-test was used for normal distribution data while nonparametric paired Wilcoxon rank sum test was used for non-normal distribution data.ResultsBoth IMRT-VB and IMRT-SF plan can expand outward to the chest wall skin and meet the dose requirements of clinical prescription. The conformal index, the homogeneity index, D2%, D98% and D50% were significantly better in IMRT-SF plan than those in IMRT-VB plan (P < 0.05). The average MU of the IMRT-SF plan was much higher than that of the IMRT-VB plan (866.0 ± 68.1 MU vs. 760.9 ± 50.4 MU, P < 0.05). In terms of organ at risk protection, IMRT-SF plan had more advantages in the protection of ipsilateral lung and spinal cord than IMRT-VB plan (P < 0.05).ConclusionOur study indicated that IMRT-SF plan displayed clinical application superiority compared to IMRT-VB plan, and the operation steps of which are simpler and faster. Besides, IMRT-SF plan took advantages in achieve effective external expansion of skin dose intensity and OARs protection.

【 授权许可】

CC BY   
© The Author(s) 2023

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