Abstract
Beam profiles measured in air and phantom were used to demonstrate the relative importance of patient scatter and collimator throat scatter as they limit the performance characteristics of the collimator. The collimator consists of two sets of jaws constrained to move in arcs centred on the target edges and is continuously variable from a 3*3 cm to a 20*20 cm field size at 125 cm SSD. Each collimator jaw is 50 cm thick with 30 cm of steel followed by 20 cm of polyethylene. The beam profiles obtained with this collimator were flat over 80% of the field dimension and were reduced to 20% of the central axis dose at 1.2 field radii in air.
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