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Targeting accuracy of frameless image-guided radiosurgery (IGRS) assessed by a hidden-target phantom test. (A) The modified Rando Head & Neck Phantom. (B) Frameless IGRS delivery to the phantom. (C) Examples of exposed Gafchromic films from the test. (D) Targeting deviations of 39 consecutive tests by measuring the absolute distance between planned isocenter (pricked point target) and delivered isocenter (center of the dark spot generated by radiation).
