Radiotherapy Treatment Plan Quality Metrics for Postmastectomy Breast Cancer Patients Using Conformal Planning Techniques

Document Type : Original Paper

Authors

1 Department of Radiation Oncology, Guru Gobind Singh Medical College and Hospital, Faridkot, Punjab, India

2 Department of Radiation Oncology, Govt. Medical College, Patiala, Punjab, India

3 Department of Radiotherapy, Govt. Cancer Hospital, MGM Medical College, Indore, Madhya Pradesh, India

4 Advance Cancer Centre, Bathinda, Punjab, India

Abstract

Introduction: The purpose of this study is to evaluate and compare treatment plan quality metrics for postmastectomy breast cancer patients using 3-Dimensional conformal radiotherapy (3DCRT) and intensity-modulated radiotherapy (IMRT) planning techniques.
Material and Methods: The current study included 50 postmastectomy breast cancer patients out of which 24 were planned with 3DCRT and 26 with IMRT technique. Treatment plan quality metrics, namely homogeneity index (HI), conformity index (CI), conformation number (CN), uniformity index (UI) and spillage index (R50), volume receiving 110% and 95% of the prescribed dose (V110% and V95%) were calculated and compared for the two planning techniques.
Results: IMRT plans have better conformity, homogeneity indices, and lower V110% than 3DCRT plans with an almost similar R50% and V95%.
Conclusion: Quantitative values of radiotherapy treatment plan quality metrics for the target are found in favour of the IMRT technique rather than 3DCRT. Implementation of these five parameters is helpful for evaluating treatment plans along with slice by slice and DVH analysis.

Keywords

Main Subjects

References

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Iranian Journal of Medical Physics
Volume 19, Issue 4
July and August 2022
Pages 214-221

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History

  • Receive Date: 22 May 2021
  • Revise Date: 31 August 2021
  • Accept Date: 19 September 2021

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