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(A) Picture of the CBCT Electron Density Phantom employed to generate the calibration curve for the assessment of the test materials' tissue-equivalence. (B) A CT scan of the phantom. (C) Calibration curve relating the standard inserts rED and CT numbers (WL 46, WW 1068). CBCT, cone beam computed tomography; CT, computed tomography; rED, relative electronic density.
