Figure 2From: Designed-seamless irradiation technique for extended whole mediastinal proton-beam irradiation for esophageal cancerD-SLIT fine-tuning. The two figures show beam’s eye view-shaped fields designed to match the cranial field and caudal field. (A) To avoid hot spots around the junction, a part of the PTV was blocked by the MLC. (B) To reduce hot or cold spots, the isocenter distance was fine-tuned by 2.5 mm (half-width of the MLC leaf in our facility).Back to article page