Planning comparison of imrt versus vmat techniques for boost treatments during breast cancer radiotherapy

Thirumal M 1


In this study, the IMRT and VMAT boost plans for 10 left-sided breast cancer patients were analysed using DVH parameters and treatment delivery parameters. Before treatments, IMRT and VMAT plans were made for every patient and they were evaluated qualitatively by noting the dose distributions slice-by-slice and then quantitatively by analysing various DVH parameters. The results were noted and statistically analysed for the significant differences in the mean values.

It was noted that the VMAT plans resulted in significantly higher mean doses as well as higher near-maximum doses. The doses to the Heart, contralateral breast, contralateral lung, were found to be statistically similar in both techniques. However, the mean doses to the ipsilateral lung were significantly lesser in IMRT techniques.  Similarly, the IMRT technique gave lesser low dose volume V5%(%) than that of VMAT. In contrast, VMAT plans required significantly less MUs per fraction as compared to IMRT plans

It is concluded that both IMRT and VMAT plans resulted in good conformation of dose with homogenous dose distribution, depending on dose-volume tolerance of the ipsilateral lung being exceeded or not, and on compliance issues of the patient during treatment, the final decision of choosing the technique is to be made.


breast boost; IMRT; VMAT; DVH parameters; ipsilateral lung

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J Ferlay ISI, Ervik M, Dikshit R, et al. GLOBOCAN 2012 v1.0, Cancer incidence and mortality worldwide: IARC CancerBase No. 11 [Internet]. International Agency for Research on Cancer 2012; 11

Taylor ME, et al. ACR appropriateness criteria on postmastectomy radiotherapy expert panel on radiation oncology-breast. Int J Radiat Oncol Biol Phys 2009; 73(4): 997-1002.

Yeh C, et al. VMAT Radiation Therapy (VMAT) Versus Intensity Modulated Radiation Therapy (IMRT) for Small-Sized Breast. International journal of radiation oncology, biology, physics 2013; 87(2): 705.

Suresh Moorthy PNM., Saroj M, Hamdy EH, et al. Dosimetric Characteristics of IMRT versus 3DCRT for Intact Breast Irradiation with Simultaneous Integrated Boost. Austral-Asian Journal of Cancer 2012; 11(3): 10.

Hijal, T., et al. Volumetric Modulated Arc Therapy in Breast Cancer Tumor Bed Boost: A Dosimetric and Clinical Study. International journal of radiation oncology, biology, physics 2011; 81(2): 258-259.

Murphy, C, et al. Impact of the Radiation Boost on Outcomes After Breast-Conserving Surgery and Radiation. International journal of radiation oncology, biology, physics 2011; 81(1): 9-76.

Prescribing, Recording, and Reporting Photon-Beam Intensity-Modulated Radiation Therapy (IMRT): Contents. Journal of the ICRU 2010; 10(1): NP.



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