Journal of Medical Physics
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Year : 1993  |  Volume : 18  |  Issue : 3  |  Page : 1-4

Dosimetry Of Tangential Radiotherapy Portals Calculation Methods And Phantom Study

Correspondence Address:
R Ravichandran

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Tangential radiotherapy portals' with cobalt-60 gamma radiations are widely used in the management of post- operative breast cancer. The treatment planning and dosimetry are complex because of the obliquity and irregular contours. A method followed at our centre makes use of selected percentiles covering the tumour volumes for various preselected inter-field separations. Equivalent field concept is used for the half-blocked portals. Comparison with computerised plans and phantom measurements validate the outlined concept.

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