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Figure 1. Diagrammatic representation of positional-dependent effective focal spot size (Eff FSS). DB (when {phi} positive, or D'B when {phi} negative), positional-dependent Eff FSS; AB, Eff FSS given by the manufacturer (measured at the point of the central ray); CB, actual FSS; {theta}, target angle given by the manufacturer; {phi}, angle of the beam of the positional-dependent effective focal spot.





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