Abstract

Since the VMAT beam is non-uniform we use three MOSFET detectors placed immediately adjacent to each other at the point of interest on the patient’s skin to improve our measurement statistics. If the skin is not easily accessible due to an immobilization mask, the MOSFETS are placed on an appropriate location on the mask. A 3.0 cm x 3.0 cm minibolus of thickness Dmax for the given x-ray energy is placed over the detectors and the treatment is delivered to the patient. The three readings are averaged and compared to the treatment planning system prediction where the effect of the mini-bolus has been taken into account. CONCLUSIONS In addition to the pre-treatment quality assurance performed by measuring the absolute dose and planar dose distribution in a phantom and comparing the results to the values as predicted by the treatment planning system, it was desired to also have a dose measurement during the first or second treatment fraction. This was accomplished by the use of MOSFET detectors. Other methods have also been reported. (1,2)

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