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Method of measurement in the evaluation of the AI with the PMMA phantom that inserted metal materials that the diameter is 1 cm in a syringe that the diameter was 1.5 cm, which filled the water. The shape of the phantom and metal inserts were cylindrical column. The SDs were measured by creating a circular ROI with 1 cm diameter. The minimum distance of the center of ROI and the metal inserts was 1 cm.
