Patent ID: 7203279
Filing Date: 2007-04-10
Classification: A61B,G01T,H04N

Abstract:
1. A radiographic apparatus having (A) radiation emitting means for emitting radiation to an object to be radiographed, and (B) a two-dimensional radiation detector with a plurality of radiation detecting elements arranged in a two-dimensional matrix, said apparatus comprising: (C) radiographic mode designating means for selectively designating a standard radiographic mode for acquiring standard radiographic images, and a non-standard radiographic mode for acquiring non-standard radiographic images; (D) standard image defect information storage means for storing pixel defect information for standard images; (E) pixel defect information converting means for performing a conversion process to convert the pixel defect information for standard images stored in said standard image defect information storage means into pixel defect information for non-standard images; and (F) signal correcting means for correcting radiation detection signals according to the pixel defect information for standard images when the standard radiographic mode is designated by the radiographic mode designating means, and according to the pixel defect information for non-standard images when the non-standard radiographic mode is designated by the radiographic mode designating means; wherein said standard radiographic images are images each having a plurality of pixels arranged in the same two-dimensional matrix as the radiation detecting elements, with the radiation detecting elements assigned in a one-to-one relationship to the pixels; said non-standard radiographic images are images for which the radiation detecting elements are assigned to pixels differently from the standard radiographic mode; said pixel defect information for standard images is defect information containing, in an element-to-pixel relationship, presence or absence of defects in the radiation detecting elements corresponding to the respective pixels of the standard radiographic images; said pixel defect information for non-standard images is defect information containing, in an element-to-pixel relationship, presence or absence of defects in the radiation detecting elements corresponding to the respective pixels of the non-standard radiographic images; and said conversion process by said pixel defect information converting means for conversion into said pixel defect information for non-standard images includes a defect determining process for checking, based on the pixel defect information for standard images stored in said standard image defect information storage means, whether even one defective radiation detecting element is present among the detecting elements assigned to the pixels of the non-standard radiographic images, and determining pixels with even one defective detecting element assigned thereto to be “defective”, and pixels with no defective detecting element assigned thereto to be “defectless”.