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Figure 9: The contribution of out-of-field dose as a result of collimator scatter varies amongst linac designs. This figure shows data adapted from Van der Giessen (1996)[28] indicating this variation. The percentage contribution of collimator-scattered dose (at an off-axis distance of 50 cm) relative to the dose at the central axis is given for seven different linac types. Measurements were taken at different centers with various models; the total number of measurements is given as n in the figure. The doses correspond to a standard field size of 10 × 10 cm2

Figure 9: The contribution of out-of-field dose as a result of collimator scatter varies amongst linac designs. This figure shows data adapted from Van der Giessen (1996)<sup>[28]</sup> indicating this variation. The percentage contribution of collimator-scattered dose (at an off-axis distance of 50 cm) relative to the dose at the central axis is given for seven different linac types. Measurements were taken at different centers with various models; the total number of measurements is given as n in the figure. The doses correspond to a standard field size of 10 × 10 cm<sup><sup>2</sup>