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Figure 5: Comparison of penumbra at dmax for 18-MV photon beam, ‘Jaw only’ uses standard collimator jaws for field definition, ‘MLC only’ MLC field with jaws parked at 35×35 cm, non-optimization method, ‘MLC+Jaw’ MLC field with jaws optimized (zero gap), optimization method

Figure 5: Comparison of penumbra at dmax for 18-MV photon beam, ‘Jaw only’ uses standard collimator jaws for field definition, ‘MLC only’ MLC field with jaws parked at 35×35 cm, non-optimization method, ‘MLC+Jaw’ MLC field with jaws optimized (zero gap), optimization method