Fig. 2From: Elective breast radiotherapy including level I and II lymph nodes: A planning study with the humeral head as planning risk volumeBeam arrangement for the 6-field IMRT technique; a axial, b sagittal and c coronal view. Two high tangential fields (red) and four additional fields (green). PTVp in red, PTVn in turquoise, contralateral breast in blue and humeral head + 10 mm in green Back to article page