Introduction: In our institution most patients are treated with intensity modulated arctherapy techniques. A patient delivery quality assurance plan (DQA) is performed prior to every treatment. In the case of Tomotherapy, a 2D array of ionization chambers (Matrixx from IBA) is used. The array's angular dependence response is already known and provided by IBA. However, the constructor’s method is not applicable in the case of tomotherapy because the inclinometer cannot be used on these machines.
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