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STEEV phantom noise of acrylic, background, and water contours in Full-Fan Head and Half-Fan Head results by different reconstructions, FDK_CBCT, iterative_CBCT with very low, low, medium, high, and very high noise reduction factors. Noise of CT results is displayed at the right. CBCT indicates cone-beam computed tomography; CT, computed tomography; FDK, Feldkamp-Davis-Kress; STEEV, stereotactic end-to-end verification.
