Delivered dose distribution visualized directly with on-board kV-CBCT: proof of principle

This work demonstrates proof of principle of visualizing delivered dose directly using kV-CBCT mounted on-board a linear accelerator. To do so, an N-isopropylacrylamide (NIPAM) polymer gel dosimeter is irradiated, CBCTs are acquired, and image processing is applied. We applied this to verify spatial accuracy of multifocal radiosurgery for which centroids of prescription dose volumes agreed within <2mm.

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