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Linac room geometry with ExacTrac image‐guided radiotherapy (IGRT) system installed. X‐ray tube 1 is paired with flat panel detector 1, and likewise tube 2 is paired with detector 2. The central beamlines intersect at the isocenter at a crossing angle φ. The oblique plane spanned by the central beamlines is at an angle of incline θ with respect to the floor
