Journal of Cancer Research and Therapeutics

ORIGINAL ARTICLE
Year
: 2019  |  Volume : 15  |  Issue : 5  |  Page : 1035--1041

A comparative study for surface dose evaluation in conventional treatment of carcinoma breast patients irradiated with Co-60 and 6 MV radiation beam


Ranjit Singh1, Arun Singh Oinam2, Gaurav Trivedi2, Harpreet Singh Kainth4, Jangvir Singh Shahi4, Baljinder Singh3, Rakesh Kapoor2 
1 Department of Radiotherapy, PGIMER; Department of Physics, Panjab University, Chandigarh, India
2 Department of Radiotherapy, PGIMER, Chandigarh, India
3 Department of Nuclear Medicine, PGIMER, Chandigarh, India

Correspondence Address:
Rakesh Kapoor
Department of Radiotherapy, PGIMER, Chandigarh - 160 012
India

Aim: In the present study, surface doses within the target area and contralateral breast (CLB) received during conventional treatment of carcinoma breast are evaluate and compared for treatment on two different beam energies, i.e., Co-60 γ-ray and 6 MV X-ray beams with thermoluminescent dosimeter, LiF:Mg, Ti (TLD-100). Materials and Methods: The study includes a group of 23 patients comprising 11 patients treated with Co-60 γ-ray beam and 12 patients by 6 MV X-ray beam. Results and Discussion: The treatment using Co-60 γ-ray and 6 MV X-ray beams contributes an average percentage dose of 8.15% ± 0.56% and 4.73% ± 0.94%, respectively, to CLB in mastectomy patients. The contribution of tangential fields (mastectomy) to the CLB doses ranges between 12.71 and 16.40 cGy (5.45%–7.03%) for treatment with Co-60 γ-ray beam and 6.33–10.95 cGy (1.86–4.69%) for treatment with 6 MV X-ray beam. The supraclavicular field (SCF) contributes 1.45%–1.93% and 1.02%–1.43% for treatment with Co-60 γ-ray and 6 MV X-ray beams, respectively. The average surface dose (normalized with breast dose) 89.1% ± 8.5% for Co-60 beam in the SCF region differs significantly from the 60.2% ± 13.0% value for 6 MV X-ray beam. Conclusion: The CLB doses for mastectomy patients are higher for Co-60 beam as compared to 6 MV X-ray beam, and better dose homogeneity is achieved within the irradiated breast from 6 MV X-ray beam. The CLB doses are slightly higher for patients treated with breast conservative radiotherapy or lumpectomy. The average surface dose to SCF decreases by ~30% of treated breast dose for treatment with 6 MV X-ray beam.


How to cite this article:
Singh R, Oinam AS, Trivedi G, Kainth HS, Shahi JS, Singh B, Kapoor R. A comparative study for surface dose evaluation in conventional treatment of carcinoma breast patients irradiated with Co-60 and 6 MV radiation beam.J Can Res Ther 2019;15:1035-1041


How to cite this URL:
Singh R, Oinam AS, Trivedi G, Kainth HS, Shahi JS, Singh B, Kapoor R. A comparative study for surface dose evaluation in conventional treatment of carcinoma breast patients irradiated with Co-60 and 6 MV radiation beam. J Can Res Ther [serial online] 2019 [cited 2020 Aug 13 ];15:1035-1041
Available from: http://www.cancerjournal.net/article.asp?issn=0973-1482;year=2019;volume=15;issue=5;spage=1035;epage=1041;aulast=Singh;type=0