Dosimetry study on conformal radiation therapy, intensity modulated radiation therapy and intensity modulated arc radiotherapy in middle thoracic esophageal cancer
10.3760/cma.j.issn.1006-9801.2013.01.005
- VernacularTitle:胸中段食管癌三维适形放疗、调强放疗及旋转调强放疗的剂量学研究
- Author:
Yao SUN
;
Xijun LIU
;
Tonghai LIU
;
Yonghua YU
;
Yong YIN
- Publication Type:Journal Article
- Keywords:
Esophageal neoplasmas;
Three-dimensional conformal radiation therapy;
Intensity modulated radiation therapy;
Intensity modulated arc radiotherapy;
Dosimetry
- From:
Cancer Research and Clinic
2013;(1):15-18
- CountryChina
- Language:Chinese
-
Abstract:
Objective To compare the dosimetry of three different radiation therapy plans [threedimensional conformal radiation therapy (3DCRT),intensity modulated radiation therapy (IMRT),intensity modulated arc radiotherapy (IMAT)].Methods Selected 15 cases with middle thoracic esophageal cancer,Varian Eclipse 8.6 planning systems were designed with 3DCRT,IMRT,IMAT,3DCRT using 5-8 coplanar radiation fields,IMRT using 7 coplanar radiation fields,IMAT using 2 radians.Three planned dose difference were compared.Results Compared with 3DCRT,IMRT and IMAT were better with heterogeneity index (HI),conformality index (CI),VPTV 95 ％,V5,V20,V35 of total lung,and V30 of heart (t =2.531,P＜ 0.05).There was no statistically significant difference for the V10,V15,V25,V30 mean dose of total lung,the mean dose of heart,the maximum dose of spinal cord,and the minimum dose of PTV among the three plans (t =1.325,P ＞0.05).Conclusion IMAT and IMRT are similar in the middle thoracic esophageal cancer radiotherapy target volume dose coverage and organs at risk protection,they are better than 3DCRT.IMAT in the monitor units and delivery time are less than IMRT.
