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RESULTS The estimated 3-D MTFs from both the simulation and experiment results show qualitative similarity in their shapes with the ideal 3-D MTFs; FWHM and FWTM results quantitatively show that the proposed method provides reliable estimation performance. In particular, the estimated 3-D MTF in a missing cone region was correctly matched with the corresponding ideal 3-D MTF. CONCLUSIONS In this work, we proposed a full 3-D MTF estimation method for CBCT systems. Based on the results, we believe that the proposed method can be used t