Year : 2020 | Volume
: 3 | Issue : 2 | Page : 55--61
Can a low-energy photon beam be suitable for the treatment of cervical malignancies? A dosimetric analysis
Manindra Bhushan1, Deepak Tripathi2, Lalit Kumar1, Rahul Lal Chowdhary4, Anjali Kakria4, Pawan Kumar1, Swarupa Mitra4, Munish Gairola4
1 Medical Physics Division, Department of Radiation Oncology, Rajiv Gandhi Cancer Institute & Research Centre, Delhi, India
2 Amity Institute of Applied Sciences, Amity University, Noida, Uttar Pradesh, India
Background: Radiotherapy to a patient with cervical cancer can be delivered by four-field “box technique” with a benefit of much less dose to intervening tissues along with a better and homogenous dose distribution at the target location. An important ingredient for a good radiotherapy planning is the choice of beam energy. The present study aims to investigate the feasibility of a 4 MV photon beam for the treatment of cervical cancers. Materials and Methods: A population of 20 patients, with carcinoma cervix, was included in the study. All the patients were planned for a prescribed dose of 45 Gy in 25 fractions. Results: Plans were evaluated for planning target volume and found better in terms of coverage and hot spots using 6 MV. The homogeneity index (HI) was 1.1 for both the energies. Similarly, conformity index (CI) was 2.0 depending on the method used for 4 MV and 6 MV photons. Although the HI and CI were comparable for both the plans, yet it seems significantly better for 6 MV. This indicates that spillage in 6 MV plans is lesser as compare to 4 MV. The present study reveals that there is a significant reduction in total monitor units in the plans with 6 MV photon beams, leading to fewer chances of secondary malignancies. Conclusion: A 6 MV photon beam has some proven mileage over 4 MV in terms of target coverage, dose homogeneity, and conformity and remains the best suitable photon energy for the treatment of cervical malignancies.
Mr. Manindra Bhushan
Medical Physics Division, Radiation Oncology Department, Rajiv Gandhi Cancer Institute & Research Centre, Sector-5, Rohini, Delhi 110085.
|How to cite this article:|
Bhushan M, Tripathi D, Kumar L, Chowdhary RL, Kakria A, Kumar P, Mitra S, Gairola M. Can a low-energy photon beam be suitable for the treatment of cervical malignancies? A dosimetric analysis.J Curr Oncol 2020;3:55-61
|How to cite this URL:|
Bhushan M, Tripathi D, Kumar L, Chowdhary RL, Kakria A, Kumar P, Mitra S, Gairola M. Can a low-energy photon beam be suitable for the treatment of cervical malignancies? A dosimetric analysis. J Curr Oncol [serial online] 2020 [cited 2022 Sep 25 ];3:55-61
Available from: http://www.https://journalofcurrentoncology.org//article.asp?issn=2589-8892;year=2020;volume=3;issue=2;spage=55;epage=61;aulast=Bhushan;type=0