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Figure 2. Schematic drawing of the oesophageal applicator: a self-made catheter consisting of two single hollow tubes (outer tube: oesophageal tube, Rüsch GmbH, Kernen-Rommelshausen, Germany; inner tube: duodenal tube, B. Braun Melsungen AG, Melsungen, Germany), which were stuck into each other, was used for endoluminal irradiation. This approach ensured central positioning of the 6 Fr brachytherapy catheter (Nucletron, Veenendaal, The Netherlands) within the oesophageal applicator. The applicators had outer diameters ranging from 6 mm to 10 mm.
