One of two points in space defined by alignment fixtures in the NTF set-up and treatment rooms. Patient set-up is usually done on the premise that the area to be treated will lie at the isocenter.
Found on http://www-bdnew.fnal.gov/operations/accgloss/gloss.html
Isocenter in aerial photography: A point where a line meets at 90-angle of tier/2. It is the point on the aerial photo platform that falls on a line half-way between the Principal point and the Nadir point. In imaging physics and radiation oncology, the isocenter is the point in space through which the central ray of the radiation beams pass. In r...Found on http://en.wikipedia.org/wiki/Isocenter
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