SU-E-T-640: Dosimetric Comparison of Intensity-Modulated Arc Therapy and Intensity-Modulated Tadiotherapy of Cervical Carcinoma

Authors


Abstract

Purpose:

To compare the dosimetric differences between intensity-modulated arc therapy (ARC) and intensity-modulated tadiotherapy (IMRT) plans for cervical carcinoma.

Methods:

15 cervical carcinoma cases were sdudied. All plans were prescribed 50 Gy in 25 fractions. Two treatment plans (ARC and IMRT) were generated using Varian Eclipse treatment planning system. Evaluate the dose parameters of targets, organs at risk (OAR), monitor units and treatment time, using dose-volume histogram (DVH).

Results:

The CI and HI of PTV was better in ARC plan than IMRT plan,but there were no statistical differences (P>0.05). There were statistical differences between V20,V25,V30,V35of health tissues. There were statistical differences between V15,V20,V25of femurs. There were statistical differences between V20,V25,V30of small bowel. The V35,V40,V45 of bladder and rectum increased in ARC plan but there were statistical differences. The number of MU resulted to be MUIMRT=1677±212, MUARC=894±213. The MU of ARC plan were 47% less on average than IMRT plan. The mean treatment time for ARC was decreased 40% compared with IMRT.

Conclusion:

The ARC was equal to IMRT on the target coverage and the dose of OAR. The ARC plan has fewer machine monitor units and lesss treatment time and significantly improves the treatment efficiency.

Ancillary