上顎洞陰影の定量解析 : 基礎実験から同一患者の経過観察への応用まで

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We evaluated the quantitative assessment of radiopasity of the maxillary sinuses using digitally processed images. The radiographs of the maxillary sinuses were exposed with Water's projection and the copper wedge filters were exposed simultaneously for the following data analysis. The original radiographs were converted to a digital image with a dedicated digitizer (TDF-500-B, Toshiba, Japan), and a quantitative analysis was performed with a medical image processor (GMS-550-U, Toshiba, Japan). The 4.2×4.2(mm)^2 of a region of interset (ROI) was selected 12mm under the infraorbital foramen and the mean pixel value was converted to the thickness of copper wedge filter width was difined as the fixed copperequivalent value (M_1) and the converted value of ROI drawn on the whole maxillary sinus was defined as the mean copper-equivalent value (M_2). The results showed that M_1 and M_2 were the useful indicators for a follow-up in the conservative theraphy against the chronic maxillary sinus.
公益社団法人日本放射線技術学会の論文
1993-06-01