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Deep inspiration breath-hold (DIBH) improved the image quality. (a) Cone beam CT (CBCT) of patient no. 4, taken at the 16th fraction; on the left—free breathing (FB) CBCT (maximum image quality score of 15) and on the right—DIBH CBCT (image quality Score 8, corresponding to the median score for DIBH). (b) CBCT image quality score improvement presented per patient. High score corresponds to poor image quality. Range of possible scores: 3–15.
