Abstract
Purpose/Objective: A technique using 4-D time-averaged CT (4-Dave) images has been developed to define a mobile GTV (mGTV). The mGTV forms the basis of a planning target volume (PTV) for use in extracranial stereotactic radiation therapy (ESRT). Megavoltage images acquired with an electronic portal imaging device (EPID) are used to validate the 4-D averaging technique for patient treatment. Cine′ images of treatment portals acquired using an EPID can be used to determine the total tumor excursion as a function of intrafraction and interfraction motion when used with restricted breathing techniques.
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