4MV 선형가속기에서의 비대칭 콜리메이터의 선량측정

Dosimetric Measurement for 4MV X-Ray Linear Accelerator with Asymmetric Collimator System

Dosimetric measurement of an asymmetric collimator system was performed, using water phantom system for 4MV X-ray linear accelerator. We have studied the system of dose calculation with those measured result. We compared the field size factor and the percent depth dose for asymmetric collimator to those factor for symmetric fields. The results show that we can use symmetric field data directly within 1% error, if we consider the off axis ratio(OAR).

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