Directional reproducibility of CT images for diagnosis using the subtraction positioning method

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When evaluating sequential maxillofacial morphological changes using CT image data obtained at different times, it is essential to normalize the imaging direction of the data at each diagnostic time. Use of the subtraction positioning (SP) method without the need of repeating the previous setting procedures on the CT image data allows reproduction of the previously obtained diagnostic orientations with minimal operation errors. We used CT image data of a dried skull scanned at different times to verify reproducibility of the previously obtained diagnostic direction using the SP method. The morphological differences between the first-determined diagnostic direction and that reproduced in subsequent CT image data were analyzed and compared. We found that the error was within 0.25° and 0.31 mm. Further, we studied how the positional relationship of the common points required in setting the common coordinates influenced the reproducibility of the diagnostic direction when the SP method was used. We found that the position of the reference points affected reproducibility for the diagnostic direction, and that use of the SP method resulted in excellent reproducibility of the CT image data taken at different times.

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