Figure 1
![Figure 1](http://media.springernature.com/full/springer-static/image/art%3A10.1186%2F1748-717X-6-54/MediaObjects/13014_2011_Article_387_Fig1_HTML.jpg)
Reconstruction of site of tumour recurrence on pretreatment planning CT and DVH analysis to determine the site of recurrence in relationship to treatment volume: An example of out-of-field recurrent tumour in a patient with T2N1 oral cavity tumor(patient-5).