Fig. 2
From: Quality assurance of the SCOPE 1 trial in oesophageal radiotherapy
Examples of differences in interpretation of the GTV from the reference standard. In each image the reference standard is shown in yellow. a shows the unnecessary inclusion of the azygos vein; b is an example of the unnecessary inclusion of tissues surrounding the tumour; c shows the incorrect inclusion of the whole bronchus; and d shows a case where the anterior part of the oesophageal wall had not been included in the GTV