Journal of Cancer Research and Therapeutics

ORIGINAL ARTICLE
Year
: 2007  |  Volume : 3  |  Issue : 3  |  Page : 140--142

On the transit dose from motorized wedge treatment in Equinox-80 telecobalt unit


Rajesh A Kinhikar, Sachin Patkar, Chandrashekhar M Tambe, Deepak D Deshpande 
 Department of Medical Physics, Tata Memorial Hospital, Parel, Mumbai - 400 012, India

Correspondence Address:
Rajesh A Kinhikar
Department of Medical Physics, Tata Memorial Hospital, Dr. Ernest Borges Marg, Parel, Mumbai - 400 012
India

Purpose: To estimate the transit dose from motorized wedge (MW) treatment in Equinox-80 telecobalt machine. Materials and Methods: Two plans were generated in Eclipse treatment planning system with universal wedge (UW) and MW each for 10x10 cm 2 . The transit dose was measured with 0.6 cc cylindrical ion chamber and thermoluminescent dosimeters (TLD) chips at a depth of 5 cm with source to axis distance (SAD) 80 cm. Results: The measured dose with ion chamber was in well agreement with the calculated dose from Eclipse within 2%. The planned dose was 100 cGy while the measured absorbed dose with ion chamber for 15, 30, 45 and 60 MW treatment was found to be 100.94, 101.04, 100.72 and 99.33 cGy respectively. For 15, 30, 45 and 60 UW treatment, the measured absorbed dose was 99.33, 97.67, 97.77 and 99.57 cGy respectively. Similarly the measured absorbed dose with TLD was within 3% with the planned dose for universal wedge (UW) and MW. From the experimental measurements, it was found that there was no significant contribution of transit dose during MW treatment. Conclusion: The actual measurements carried out with ion chamber in Equinox-80 machine for UW and MW revealed no variation between the doses delivered. The doses were comparable for both UW and MW treatments. The results from TLD measurements additionally confirmed no variation between the doses delivered with UW and MW. It was also demonstrated that the observed excess or less transit dose with MW does not have any significant clinical impact. This assured the safe dose delivery with MW.


How to cite this article:
Kinhikar RA, Patkar S, Tambe CM, Deshpande DD. On the transit dose from motorized wedge treatment in Equinox-80 telecobalt unit.J Can Res Ther 2007;3:140-142


How to cite this URL:
Kinhikar RA, Patkar S, Tambe CM, Deshpande DD. On the transit dose from motorized wedge treatment in Equinox-80 telecobalt unit. J Can Res Ther [serial online] 2007 [cited 2022 Jun 28 ];3:140-142
Available from: https://www.cancerjournal.net/article.asp?issn=0973-1482;year=2007;volume=3;issue=3;spage=140;epage=142;aulast=Kinhikar;type=0