The conversion of images at micro level of normal and with very early stage disease forms of the lung and the quantitative analysis of morphology on the images can contribute to the chest image diagnosis of the next generation. The collection of high minute CT images is expected in using high luminance synchrotron radiation CT for converting the images. We propose a method of quantitatively evaluating the spatial resolution of synchrotron radiation CT. We develop the technique that can measure spatial resolution in high accuracy for a diameter that is thicker than pixel size. We show that the highly accurate measurement becomes possible by applying this technique with the wires of 3 μ m,10 μ m and 30 μ m and by comparing and evaluating the measurement results.%肺の正常形態,極早期の疾患形態のミクロレベルでの画像化とその定量的な形態解析の実現は,次世代の胸部画像診断への貢献が期待できる.この画像化に高輝度な放射光CTを利用することで高精細なCT画像の収集が期待される.本報告では放射光CTの空間分解能を定量的に評価する方法を提案する.従来のワイヤ法では測定困難であった画素サイズに比べて太い径でも高精度に測定できる手法を開発し,本手法を3μm,10μm,30μmのワイヤに適用して測定結果を比較評価することによって径の太いワイヤでも高精度に測定が可能になることを示す.
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