2Department of Health Physics, Medipol University, Institute of Health Sciences, İstanbul-Türkiye DOI : 10.5505/tjo.2023.4152 OBJECTIVE
Adjuvant radiotherapy (RT) has been used often at breast cancer treatment. RT techniques differ from each other in terms of accessibility and applicability. We aimed to compare the dosimetric evaluations of four modern RT techniques through ten breast cancer patients that had been treated previously with intensity-modulated RT (IMRT) technique.
METHODS
A single-center dosimetric study was performed based on treatment plannings of left-sided breast cancer
patients. The patient's images, simulated at computed tomography with deep inspiration breath hold
technique between March and June 2023, were used. Four different techniques, field-in-field (FinF),
dynamic IMRT (dIMRT), volumetric modulated arc treatment (VMAT), and helical therapy (HT) were
created on each patient image. Conformal index (CI) and homogeneity index (HI) were calculated. Mean
doses of heart, contralateral breast, volume of doses 5 Grey (Gy) (V5) and 10 Gy (V10) of left lung and total
lungs were also calculated for each plan and the descripted and comparisons analysis was performed.
RESULTS
The better results of CI and HI were reported with dIMRT, VMAT, and HT techniques. However, these
approaches were expected with increased percentage of lower doses at organs at risk (OAR). The lowest
of V5 of left and total lungs, mean heart, and contralateral breast doses were achieved with FinF techniques,
HT values were observed similar to FinF by these factors at OAR. Particularly, the lowest V20
value was demonstrated at HT techniques.
CONCLUSION
Adjuvant RT techniques at breast cancer still carry controversial subtitles. New technologic improvements
might be indispensable and treatment plannings should be based on the individual properties
of patients.