Journal of Medical Physics
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Year : 1986  |  Volume : 11  |  Issue : 3  |  Page : 94

Primary Radiation Therapy For Early Breast Cancer : Treatment Planning And Dosimetric Verification with Measurements In Breast Phantom.



Correspondence Address:
S M Deore


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Source of Support: None, Conflict of Interest: None


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The treatment of breast cancer presents a highly complex structure, as the target volume is defined by breast itself, the lymph drainage sites to internal mammary chain, the aupraclavicular fosse and the axilla. This target volume in the presence of adjacent structures as the lung and opposite breast presents challenging problems to treatment planning. This article elaborates the treatment technique being used at our centre for the last 4 years. The target volume is typically treated with opposed tangential fields using wedge pair with 6 MeV Linear Accelerator. The Therasim-750 Simulator is used for the planning of the tangential fields and dose distribution for each patient is carried out on TP-11 Computer system. The extent dose uniformity to the breast and surrounding nodal areas is confirmed with the dosimetric measurements in a specially designed breast phantom. All the measurements were carried out using TLD crystals, Our dosimetric results shows the doses to the nodal areas were 15 to 20% less than the mid breast. In routine course of treatment this is compensated with an additional direct hockey stick field for nodal irradiation. During the last 4 years, we have treated a total of 96 breast cases with this technique. Our clinical results show fair to excellent cosmesis in all cases except fibrosis in two cases and local recurrence in one patient. Thus with this technique long term controls and improved cosmesis is being achieved.


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