Observation of 3 - dimensional Internal Structure of Rock Using X - ray CT : (1) Density Calibration of CT Value

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  • X線CTによる岩石内部構造の3次元観察: (1) CT値と物体密度の関係式の決定
  • Xセン CT ニヨル ガンセキ ナイブ コウゾウ ノ 3ジゲン カンサツ 1

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Abstract

To observe and to analyze the internal structures of various kinds of rock samples, a 3-dimensional CT (Computerized Tomography) image was reconstructed from the data obtained by an industry X-ray CT scanner with high intensity X-ray beam. FBP (Filtered BackProjection) method was used for the reconstruction of the CT image from the X-ray intensity data. Spatial resolution and size of the image were 0.2×0.2×1 mm and 1024×1024×320 pixels (voxels), respectively. CT value (X-ray liner absorption coefficient for the object) was stored as a 16 bits integer on each pixel in the image. Density calibration of the CT value in the image was performed using the standard samples with known densities. New methods were applied to the calibration to correct the effect of low CT values in the edge region on the mean CT value of each sample. Using the result of the calibration, density of an object in the CT image was determined from the CT value with decision error of about 0.3 g/cm3.

Journal

  • Geoinformatics

    Geoinformatics 8 (4), 239-255, 1997

    Japan Society of Geoinformatics

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