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A comparison of conventional, conformal and intensity-modulated coplanar radiotherapy plans for posterior fossa treatment

¹ Radiotherapy Physics Section, Radiotherapy Department, St Bartholomew's Hospital, 25 Bartholomew Close, West Smithfield, London EC1A 7BE and ² Radiotherapy Department, St Bartholomew's Hospital, 25 Bartholomew Close, West Smithfield, London EC1A 7BE, UK

View larger version (19K): [in a new window]   Figure 1. Field arrangements for the three plans. (a) Conventional plan; (b) three-dimensional conformal radiotherapy (3D-CRT); and (c) intensity-modulated radiotherapy (IMRT). The planning target volume is the lightly shaded area; the cochlea (dark shading) and the artificial organ-at-risk (dashed line) used in planning, are also outlined.

View larger version (30K): [in a new window]   Figure 2. Dose–volume histograms for organs-at-risk. Parallel opposed pair, thin black line; wedged pair, thick grey line; intensity-modulated radiotherapy (IMRT), thick black line.