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A slice of the CT of the base of skull case. The two solid red arrows show the directions of the IMPT beams in the transverse plane at gantry angles of 75 degrees and 270 degrees. The vertical dashed red arrow shows the projection of the IMPT beam at a couch angle of 90 degrees and gantry angle 300 degrees. The top purple structure is the target, the bottom purple structure is the brainstem, the brown and blue structures are the temporal lobes.
