Figure 1

Image sample acquisition process. Experimental data to observe the dissolution of the grains of Hanford soil in a polyether ether ketone column from the X-ray microtomography beamline at the National Synchrotron Light Source. The projection image set has a projection angle variation of 0.15° and consists of 1200 projection images. (a) Projection image with 500 × 1340 pixels at a projection angle of 30°. (b) COR, the projected rotation axis of the stage, determination when a sinogram has two fixed points. The white vertically long rectangle sitting at a projection angle of 30° corresponds to the yellow horizontally long rectangle in (a). Each sinusoidal curve marked by the pink and blue arrows has a minimum at projection angles of 156° and 172°, respectively. (c) Set the COR as the center of the sinogram to apply the filtered inverse Radon transform by inserting 17 rows at the bottom of (b) to have the COR in the center of (c). (d) Analysis of the corresponding positions of two high-MAC areas in the reconstructed slice to two high-density parts of (b). (e) Part of the reconstructed slice image, particularly containing soil grains with a size of 600 × 600 pixels (left), an image corresponding to the region of interest by using segmentation of the area of the soil grains (middle), and an enlarged image to see the internal pattern of the soil grains (right).