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Monitor unit calculations using a 3D computerised treatment planning system: verification in an anthropomorphic
1Department Radiation Oncology, Mater Hospital, Newcastle, Australia. mdsjho@cc.newcastle.edu.au
Australasian Physical & Engineering Sciences in Medicine
|March 31, 2000
Abstract:
The aim of this work was to assess the monitor unit calculation accuracy of a new 3D computer planning system in a volume containing significant lung heterogeneity. An anthropomorphic phantom drilled to accommodate a cylindrical ionisation chamber was used for measurements. Results were also compared to an older 2D system and a manual calculation method. Only a slight improvement was achieved with the new system and an energy dependence was evident. This type of test is recommended before implementing a new 3D planning system.