Test purpose
Validation of calculation algorithm for wide spectrum of clinical cases, including plans with long (>26 cm) field sizes.
Test method
More than 100 fields of different plan types were measured and compared against the results calculated by the IQM calculation algorithm.
Test results
The overall agreements of the measured signal with the calculated signal was -0.2% (±1.3%). For long (> 26 cm) field sizes the agreement of the measured signal and the calculated signal is +0.4% (±1.4%).
Conclusion
IQM signal measurements agree well with the calculated references. The difference between the measured and the calculated reference signal for long field IMRT beams was slightly larger than for smaller IMRT fields. IQM can be used to verify field size of up to 40 cm x 40 cm. Very limited user interaction was necessary to achieve these results.
