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Fig. 6 | Radiation Oncology

Fig. 6

From: Tangent-based volumetric modulated arc therapy for advanced left breast cancer

Fig. 6

Delineation for planning optimization. All structures were at least 0.6 cm away from PTV (magenta line). A 2.0-cm wide ring structure (between two yellow lines) was designed for optimization to control the dose falloff. It was 0.6–2.6 cm away from PTV towards left lung, 1.6–3.6 cm away from PTV towards right breast, and 2.6–4.6 cm away from PTV towards back. Left lung and heart were both designed into two parts depending on whether they were within the ring structure (LungL1 and Heart2) or not (LungL2 and Heart1). The breast tissue within the 5 cm from the medial side was defined as BreastR2, and the rest was BreastR1

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