Conformity Index and Homogeneity Index of the Postoperative Whole Breast Radiotherapy

Authors

  • Deva Petrova Clinical Hospital Acibademsistina, Skopje
  • Snezana Smickovska University Clinic of Radiotherapy and Oncology, Faculty of Medicine, Ss Cyril and Methodius University of Skopje, Skopje
  • Emilija Lazarevska University Clinic of Radiotherapy and Oncology, Faculty of Medicine, Ss Cyril and Methodius University of Skopje, Skopje

DOI:

https://doi.org/10.3889/oamjms.2017.161

Keywords:

breast, cancer, radiotherapy, conformity index, homogeneity index

Abstract

BACKGROUND: The treatment of breast cancer involves a multidisciplinary approach in which radiotherapy plays a key role.

AIM: The conformity index and the homogeneity index are two analysis tools of a treatment plan using conformal radiotherapy. The purpose of this article is an analysis of these two parameters in the assessment of the treatment plans in 58 patients undergoing postoperative radiotherapy of the whole breast.

MATERIALS AND METHODS: All 58 patients participating in the study had a conservatively treated early-stage breast cancer. The treatment was performed using a standard regimen of fractionation in 25 fractions up to a total dose of 50Gy. Dose-volume histograms were generated for both plans with and without segmental fields.

RESULTS: Pair samples t-test was used. The technique with segmental fields allowed us more homogeneity distribution when compared to standard two tangential field techniques. The HI values were 1.08 ± 0.01 and 1.09 ± 0.01 for segment and technique with two tangential fields (p < 0.001). The DHI values were 0.92 ± 0.02 and 0.901 ± 0.01 for segment and technique with two tangential fields (p < 0.001). The CI values were 1.38 ± 0.02 and 1.43 ± 0.3 for segment and technique with two tangential fields (p = 0.0018).

CONCLUSION: The results showed that the conformity and the homogeneity index are important tools in the analysis of the treatment plans during radiation therapy in patients with early-stage breast cancer. Adding segment fields in the administration of radiotherapy in patients with conservatively treated breast cancer can lead to improved dosage homogeneity and conformity.

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Published

2017-09-13

How to Cite

1.
Petrova D, Smickovska S, Lazarevska E. Conformity Index and Homogeneity Index of the Postoperative Whole Breast Radiotherapy. Open Access Maced J Med Sci [Internet]. 2017 Sep. 13 [cited 2024 May 21];5(6):736-9. Available from: https://oamjms.eu/index.php/mjms/article/view/oamjms.2017.161

Issue

Section

B - Clinical Sciences