ABSTRACT
Objective:To compare the dosimetric differences of the planning target volume(PTV)and the organs at risk(OAR)for postoperative patients with cervical cancer on intensity-modulated radiotherapy(IMRT)and conventional 4 fields(4F)or 2 fields(2F)radiotherapy.Methods:Six postoperative patients with cervical cancer were chosen randomly.The next steps were CT scan,PTV and OAR contouring.The treatment protocols were designed into conventional 4F,2F and IMRT by TPS.Finally,the doso distribution and DVH were compared.Results:About the conformability of PTV,IMRT showed a significantly superior dose distribution over conventional 4F(P=0.015),and conventional 4F was superior to 2F(P=0.043).IMRT as compared with conventional 4F or 2F protocols,the received dose of the 50%volume of bladder was reduced by 25.8%and 27.5%,the rectum was reduced by 12%and 14.3%,the small intestine was reduced by 36.5%and 50%.But the differences of the femoral head(left & right)and the ilium have no statistical significance.Conclusion:in postoperative radiotherapy for cervical cancer,IMRT have Inore dosimetric advantages than conventional radiotherapy.
ABSTRACT
Objective To evaluate the therapeutic effects of stereotactic conformal radiotherapy (SCRT) on 30 cases of thalamic and brainstem tumors. Methods During the period from October 1997 to April 2002, 30 patients, 19 male and 11 female, with an age range from 13 to 68 years (an average of 37 years) suffering from thalamic and brainstem tumors, were treated in our institute. The size of the tumors ranged from 3.5 cm 3 to 73.0 cm 3 with an average of 16.5 cm 3. Eight cases were treated with SCRT after regular radiotherapy, 7 cases were treated with SCRT after surgical resection of the tumor and 15 cases were treated with SCRT only. Results The clinical symptoms of all the patients disappeared thoroughly. Their KPS was significantly improved (P