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Coronal images of treatment plans for each treatment technique for a representative patient: intensity modulated radiation therapy (IMRT) in free breathing (FB) (top left), IMRT in deep inspiration breath hold (DIBH) (top right), proton therapy in FB (bottom left), proton therapy in DIBH (bottom right). The contours shown are the body (green), CTV (pink), PTV (cyan), lungs (blue), heart (yellow), and heart valves (yellow).
