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Accuracy of set-up of thoracic radiotherapy: prospective analysis of 24 patients treated with radiotherapy for lung cancer

Departments of ¹Radiotherapy and Oncology and ²Computing and Information, Royal Marsden NHS Trust, Sutton, Surrey SM2 5PT, UK

View larger version (90K): [in a new window]   Figure 1. Summary of mean actual treatment–simulator displacement showing field placement errors from a single simulator check film (). The crossing point of the fine t-bars represents the mean of these differences and their length, two standard deviations from this mean. The thick t-bars indicate the narrow confidenceinterval.

View larger version (89K): [in a new window]   Figure 2. Pie charts showing overall maximum field displacement errors in the (a) left–right axis and the (b) superior–inferior axis, both with reference to the clinical threshold of 0.7 cm, and (c) overall maximum field displacement errors in the coronal plane.

View larger version (130K): [in a new window]   Figure 3. Distribution of treatment–simulator field placement errors. Arms up group; (a) left–right direction, (b)superior–inferior direction, and (c) rotational errors. Arms down group; (d) left–right direction, (e) superior–inferior direction, and (f) rotational errors. A minus sign indicates a field displacement to the left, inferiorly, or anti-clockwise.