Abstract
The advantages of Rapid Arc plans versus Intensity modulated radiotherapy plans for Carcinoma left breast were analyzed. In this study 20 Post mastectomy carcinoma left breast patients were analyzed. Both Intensity modulated Radiotherapy and Rapid Arc plans were generated for these patients. IMRT plans with 7 beams in an arc fashion and VMAT plans with two semi arcs were made to achieve 95% dose coverage to 100% volume. The plans were evaluated using Dose volume Histograms. The mean Conformity and Homogeneity index in VMAT is found to be 1.05 and 0.065 respectively whereas in IMRT it was 1.07 and 0.069. The 20% volume of Heart received a mean dose of 960cGy in VMAT and 1300cGy in IMRT. The mean dose was 1236cGy in VMAT and 1870cGy in IMRT. The ipsilateral Lung received 3395cGy to 5% volume and 1840cGy to 20% volume on an average and the mean dose was 1205cGy in VMAT, while the same were found to be 3525cGy, 2012cGy and 1435cGy respectively in IMRT. The Contralateral Lung received a mean dose of 505cGy in VMAT and 553cGy in IMRT. The mean Monitor units in VMAT were 512MU and 1170MU in IMRT. The NTID in VMAT is 108.8 x 105 Gycm3 and 110.1 x 105 Gycm3 in IMRT. The target coverage, homogeneity and Conformity index were better in VMAT plans. The Ipsilateral Lung and heart dose were very less in VMAT plans. The Contralateral Lung dose and the Normal Tissue Integral Dose were also lesser in VMAT plans however the difference is not very appreciable. The MU in VMAT plans is almost 50% that of the IMRT plans which results in the reduction of treatment time. On the whole VMAT proves to be a better modality for treating Ca. Left Breast Patients.
Highlights
Breast cancer is the most common malignancy in women
The Contralateral Lung dose and the Normal Tissue Integral Dose were lesser in Volumetric modulated arc therapy (VMAT) plans the difference is not very appreciable
Target coverage The dose coverage obtained in VMAT is more uniform and homogeneous than that obtained with intensity modulated radiotherapy (IMRT)
Summary
Breast cancer is the most common malignancy in women. Radiotherapy is an integral part of Breast cancer management either after breast conservation surgery or in post mastectomy cases. There have been significant advances in the delivery of radiotherapy over the past few decades These include increased sophistication of imaging techniques, which has resulted in improved accuracy of target volume definition and delineation, as well as developments in treatment planning systems and linear accelerator delivery capabilities leading to improved dose distributions and conformity. Materials and Methods: In this study 20 Post mastectomy carcinoma left breast patients were analyzed Both Intensity modulated Radiotherapy and Rapid Arc plans were generated for these patients. The 20% volume of Heart received a mean dose of 960cGy in VMAT and 1300cGy in IMRT. The Contralateral Lung received a mean dose of 505cGy in VMAT and 553cGy in IMRT.
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