The present invention relates to a method of reconfiguring the X- ray CT image reconstruction method, and relates to an apparatus, X- ray having the locally high-resolution image, and more particularly a single-layer device. Further, the device according to the present invention can also adjust the resolution of the object and the X- ray generator X- ray CT images are to be reconstructed to change the distance in between. Image reconstruction method of a single layer comprising a high resolution X- ray CT image for local region of interest in accordance with an aspect of the present invention, a portion of the object, including the local area of interest in the X-ray generator side is in a range of X-ray irradiation in close proximity to the stage to the object to acquire the projection data on the X-ray irradiation; Object entirety for calculating a virtual projection data that can be acquired on the assumption that an X-ray is irradiated to the entire object in a position close to the from the object to the projection data investigation to X-rays at the location belonging to the irradiation range of the X-ray and step; Hypothetical projection of the entire target object other than the data of the local area of interest comprising the steps of combining the partial data and the projection data obtained at a position close to said X-ray source side; Characterized by including the step of reconstructing the combined projection data. ; Unsaturated soil, characteristic curve, matric suction
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