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Setup variations in locoregional radiotherapy for breast cancer: an electronic portal imaging study

¹ Radiation Therapy Program, British Columbia Cancer Agency, Vancouver Island Centre, 2410 Lee Avenue, Victoria, BC, V8R 6V5, ² University of British Columbia, BC and ³ Population and Preventive Oncology, British Columbia Cancer Agency, BC, Canada

View larger version (16K): [in a new window]   Figure 1. Monoisocentric technique of locoregional radiotherapy to the breast/chest wall and regional nodes. The isocentre is at the level of the inferomedial aspect of the clavicular head. Two reference marks located 10 cm inferior to the isocentre (an anterior midline and a lateral mid-axillary mark) are tattooed. These tattoos are the treatment reference centres and all moves and distance readings are made relative to these points. An anterior midline mark at 20 cm inferior to the isocentre is also tattooed and used to align the patient to parallel the long axis of the treatment couch and reproduce the CT setup position.