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Equivalent diameters of elliptical fields

Medical Physics, Addenbrookes NHS Trust, Cambridge CB2 2QQ, UK

View larger version (10K): [in a new window]   Figure 1. Relative dose per monitor unit for the circular fields, at depth 1 cm () and 5 cm (). The doses are normalized to the dose resulting from the use of the 12 cm diameter circular collimator.

View larger version (10K): [in a new window]   Figure 2. Ratio of predicted to measured doses, 1 cm deep, for predictions made using Equation (1) |<|(|>|. The order of the points along the x-axis is as per the order in Table 1.

View larger version (11K): [in a new window]   Figure 3. Ratio of predicted to measured doses, 1 cm deep, for predictions made using Equation (3) D=2AB/(A+B). The order of the points along the x-axis is as per the order in Table 1.

View larger version (10K): [in a new window]   Figure 4. Ratio of predicted to measured doses, 5 cm deep, for predictions made using Equation (1) |<|(|>|. The order of the points along the x-axis is as per the order in Table 1.

View larger version (11K): [in a new window]   Figure 5. Ratio of predicted to measured doses, 5 cm deep, for predictions made using Equation (3) D=2AB/(A+B). The order the points along the x-axis is as per the order in Table 1.