Computed tomography device and computed tomography image correction method using the same

A computed tomography device comprising:

• a gantry comprising a light source for irradiating light, a detector disposed facing the light source and for receiving the light, and an arm for supporting the light source and the detector;
• an image processing processor configured to receive a two-dimensional detection image for a subject from the detector to convert the received two-dimensional detection image to two-dimensional detection image data, generate two-dimensional reference data based on the two-dimensional detection image data and an initial transformation projection matrix, generate a corrected transformation projection matrix based on a difference between the two-dimensional reference data and the two-dimensional detection image data, and generate three-dimensional reconstruction image data based on the two-dimensional detection image data and the corrected transformation projection matrix;
• a body portion configured to support the arm, and accommodate the image processing processor;
• and
• a moving portion configured to be connected to the body portion.