Patent ID: 7366277

Claim:
A tomographic device, which comprises a detecting means which is constituted by arranging a plurality of detector elements in 2-dimension and detects X-rays irradiated to a subject and penetrated through the subject, means for producing the detected data as projection data, a projection data memory means which stores the produced projection data, means for dividing an image reconstruction area having a predetermined size corresponding to a region of interest of the subject into image data segment regions having an arbitrary size and an image reconstruction computing means which performs an image reconstruction computing on the divided image data segment regions from the projection data and generates a 3-dimensional tomographic image, wherein the image reconstruction computing means includes extracting means which extracts from the projection data 2-dimensional projection data segment regions corresponding to channel direction and row direction of the detecting means necessary for generating the 3-dimensional tomographic image of the divided image data segment regions, a projection data segment region memory means which stores the extracted 2-dimensional projection data segment regions and a 3 dimensional back projection processing means which successively reads out the 2-dimensional projection data segment regions stored in the projection data segment region memory means and performs 3-dimensional back projection processing for the every respective corresponding image data segment regions.