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Modelling

Once the beam data and machine parameters have been introduced,

the beam model should be completed according vendors instructions

The amount of adjustable parameters depends on the vendor

i.e. Varian: second source (size, mean energy, relative intensity), MLC (DLS,

transmission), spot size.

Therefore modeling is an iterative process when a compromise for the

different clinical situations in which it be used has to be reached.

Evaluate the goodness of the model by

Comparing PDDs and profiles using the softare

beam commissioning application