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. 2014 Oct 1;87(1043):20140233. doi: 10.1259/bjr.20140233

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© 2014 The Authors. Published by the British Institute of Radiology

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Figure 1. — Main screen of the 4Dtool software. The upper panel shows CT images at the reference phase. The lower panel shows four-dimensional CT images at respective phases overlaid on the CT image at the reference phase. Red, yellow, white and light blue lines on the upper panel are the gross tumour volume, clinical target volume, internal target volume and field-specific target volume, respectively. Calculating beam angle is set to 20°. Exp, exposure; resp, respiratory. For colour images see online: www.birpublications.org/doi/abs/10.1259/bjr.20140233.