Dosimetric study of adaptive radiotherapy in lung cancer / 安徽医科大学学报

ABSTRACT

Six patients with lung cancer treated with therapy were included. They were retrieved the image and re-planned by fraction 10. The volume of GTV was reduced (65. 59 ± 17. 09)% after three-stage treatments. The doses of target tumor were the same in three-stage treatments. Compared with IMRT, ART1 reduced V20 , V30 , MLD of whole lung by 2. 01%,2. 66%,241. 78 cGy(P=0. 005,0. 039,0. 026). Compared with ART1,ART2 further re-duced the indexes by 3. 21%,2. 97%,288. 64 cGy(P=0. 005,0. 013,0. 046). The doses of ipsilateral lung were reduced significantly (P<0. 05). But this was not for opposite lung. The dose V50,Dmean of heart and V55 of esopha-gus were similar to each plan. Dmean of esophagus with ART1 was smaller than with IMRT(261. 98 cGy,P=0. 002) and Dmean of esophagus with ART2 was smaller than with ART1(300. 43 cGy,P=0. 008). D2% and Dmean of spinal cord were reduced in turn significantly(P<0. 05).