The comparison of three bowel delineation strategies in the radiation therapy of cervical cancer
10.3760/cma.j.issn.1004-4221.2016.01.017
- VernacularTitle:宫颈癌放疗计划中小肠3种勾画方法比较
- Author:
Yanze SUN
;
Gang ZHOU
;
Jianjun QIAN
;
Xueguan LU
;
Ye TIAN
- Publication Type:Journal Article
- Keywords:
Bowel delineation;
Cervical neoplasms/radiotherapy;
Dosimetry
- From:
Chinese Journal of Radiation Oncology
2016;25(1):67-70
- CountryChina
- Language:Chinese
-
Abstract:
Objective To study three contouring approaches of the bowel and evaluate the bowel dose volume with cervical cancer patient.Methods Twelve patients were selected,prescribed dose 45 Gy/ 25f.For each patient we contoured the bowel according to three different definitions:bowel loops,bowel bag and peritoneal space.Then we generated three rival plans each considering a different bowel definition and to evaluate dose differences of the HI,CI of PTV and D D V5-V45 of bowel loops with paired t-test.Results Comparison between BL and BB plan,Dmax,HI and CI of PTV,V5-V45 of bowel loops were not significantly different (P =0.171,0.076,0.192,P =0.315-0.855),D of PTV and Dmax of bowel loops had difference (P=0.017,0.038).Comparison between BL and PS plan,Dmax,D HI and CI of PTV and Dmax of bowel loops had differences (P=0.033,0.044,0.046,0.041,0.013),V5-V45 of bowel loops were not significantly different (P=0.416-0.977).If the bowel loops V40 ≤ 15％,and bowel bag and peritoneal space V40≤20％.Conclusions All definitions provided a very similar dose volume of bowel loops.Taking into account HI and CI of PTV and max dose of bowel loops,BB seems better than PS.
