Journal of Medical Physics
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INVITED PAPER
Year : 2009  |  Volume : 34  |  Issue : 3  |  Page : 137-140

Practical and clinical considerations in Cobalt-60 tomotherapy


1 Department of Medical Physics, Cancer Centre of Southeastern Ontario (CCSEO), Kingston, ON, Canada; Departments of Oncology and Physics, Queen's University, Kingston, ON, Canada; Department of Physics, University of Pune, Pune, Maharashtra, India
2 Departments of Oncology and Physics, Queen's University, Kingston, ON, Canada
3 Department of Medical Physics, Cancer Centre of Southeastern Ontario (CCSEO), Kingston, ON, Canada; Departments of Oncology and Physics, Queen's University, Kingston, ON, Canada
4 Department of Physics, University of Pune, Pune, Maharashtra, India

Correspondence Address:
Chandra P Joshi
Department of Medical Physics, Cancer Centre of Southeastern, Ontario at Kingston General Hospital, 25 King Street West, Kingston, Ontario K7L 5P9, Canada

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Source of Support: None, Conflict of Interest: None


DOI: 10.4103/0971-6203.54847

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Cobalt-60 (Co-60) based radiation therapy continues to play a significant role in not only developing countries, where access to radiation therapy is extremely limited, but also in industrialized countries. Howver, technology has to be developed to accommodate modern techniques, in­clud­ing image guided and adaptive radiation therapy (IGART). In this paper we describe some of the practical and clinical considerations for Co-60 based tomotherapy by comparing Co-60 and 6 MV linac-based tomotherapy plans for a head and neck (HandN) cancer and a prostate cancer case. The tomotherapy IMRT plans were obtained by modeling a MIMiC binary multi-leaf collimator attached to a Theratron-780c Co-60 unit and a 6 MV linear accelerator (CL2100EX). The EGSnrc/BEAMnrc Monte Carlo (MC) code was used for the modeling of the treatment units with the MIMiC collimator and EGSnrc/DOSXYZnrc code was used for beamlet dose data. An in-house inverse treatment planning program was then used to generate optimized tomotherapy dose distributions for the H and N and prostate cases. The dose distributions, cumulative dose area histograms (DAHs) and dose difference maps were used to evaluate and compare Co-60 and 6 MV based tomotherapy plans. A quantitative analysis of the dose distributions and dose-volume histograms shows that both Co-60 and 6 MV plans achieve the plan objectives for the targets (CTV and nodes) and OARs (spinal cord in HandN case, and rectum in prostate case).


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