System and method for providing 2-dimensional ct image corresponding to 2-dimensional ultrasound image

3D is a system and method for providing a two-dimensional CT image are provided corresponding to the ultrasound image and the 2D ultrasound image by performing image registration between 3-dimensional CT image. The system, the CT image forming unit configured to form a three-dimensional CT image of the object of interest in the target body; An ultrasound image forming unit configured to form a 3D ultrasound image and the 2D ultrasound image of the object of interest; A storage unit for storing a plurality of conversion parameters to perform a rigid body transformation (rigid-body transform) on the 3D ultrasound image; And 3D while performing the image registration between ultrasound images and three-dimensional CT image and the three-dimensional set up a three-dimensional orthogonal coordinate system including a reference section in the ultrasound image, and by using the conversion parameters to perform a rigid body transformation to the 3D ultrasound image measuring the degree of similarity between the reference sectional plane image and the 2D ultrasound image corresponding to the reference cross-section and includes operative to extract a two-dimensional CT images corresponding to the two-dimensional ultrasound images using the measured similarity processor. Ultrasound, CT, image registration, a rigid body transformation, similarity