The development of accurate and convenient dosimetry tools with the capacity to comprehensively verify advanced 4D treatments is an important and urgent goal for radiation therapy physicists. At present, implementation into the clinic is being severely hampered and delayed by the difficulty in adequately verifying these techniques using traditional dosimetry methods. The work presented here represents an important step towards providing a solution. Accurate high-resolution dosimetry has been performed using a convenient and practical system and the results were confirmed with independent measurement using EBT film. Both dosimetry techniques clearly identified and enabled evaluation of two sources of inaccuracies in the dose modeling algorithms of the ECLIPSE planning system; penumbral blurring and leaf-leakage.
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