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 Dmax,Dmean,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),Dmean of PTV and Dmax of bowel loops had difference (P=0.017,0.038).Comparison between BL and PS plan,Dmax, Dmean,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.
Sun Yanze,Zhou Gang,Qian Jianjun et al. The comparison of three bowel delineation strategies in the radiation therapy of cervical cancer[J]. Chinese Journal of Radiation Oncology, 2016, 25(1): 67-70.
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