A comparative study of dosimetry between rotational volume modulated radiation therapy and static intensity modulated radiation therapy in postoperative patients with cervical cancer
Objective To compare the dosimetric differences between two radiotherapy techniques,volumetric modulated arc therapy(VMAT)and intensity modulated radiation therapy(IMRT),in the postoperative radiotherapy plan for cervical cancer.Methods From March to September 2023,25 postoperative cervical cancer patients in Yangchun People's Hospital were selected.The Pinnacle planning system was used to develop radiotherapy plans using two different techniques,VMAT and IMRT,respectively.The dosimetric and execution efficiency indicators of the two radiotherapy techniques were compared.Results The target area Dmax of VMAT plan was significantly smaller than that of IMRT plan,while the difference of Dmin,Dmean,V95 and V105 was not statistically significant,while the difference of CI and HI was statistically significant.There were no significant differences in femoral head Dmin,rectal Dmean,V50 and bladder V50.There were significant differences in Dmax,Dmean,V45 of the femoral head,V40,V30 of the rectum,Dmean,V40,V30 of the bladder,and Dmax,V30,V20 of the small intestine(P＜0.05).There were significant differences in MU and treatment time between VMAT and IMRT(P＜0.05).The MU of VMAT was significantly lower than that of IMRT,and the treatment time was also significantly shorter(P＜0.05).Conclusion Both VMAT and IMRT can meet the target dose requirements and endanger organ protection in postoperative radiotherapy for cervical cancer patients,but their dosimetry and execution efficiency differ significantly,providing a reference for clinical selection of radiotherapy plans.
Pinnacle systemCervical cancer radiotherapyDosimetric comparisonVMATIMRT
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