IMRT

Invasive frame-based: targeting

l Originally defined by invasive head frame g Golden standard l Origin coordinates = center of head frame l Accurate determination of stereotactic coordinates of a target point g Usually center of the target volume

Figure 1: The invasive head frame fixation (frame-based) (left) and the mask immobilization (frameless approach) (right)

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Finally, even with the technological advancements that enable a good dosimetrical