The capability of error detection of patient-specific QA tools plays an important\nrole in verifying MLC motion accuracy. The goal of this study was to investigate\nthe capability in error detection of portal dosimetry, MapCHECK2\nand MatriXX QA tools in IMRT plans. The 9 fields IMRT for 4 head and neck\nplans and 7 fields IMRT for 4 prostate plans were selected for the error detection\nof QA devices. The measurements were undertaken for the original plan\nand the modified plans, where the known errors were introduced for increasing\nand decreasing of prescribed dose..................
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