PROBLEM TO BE SOLVED: To obtain an X-ray CT tomographic image where a tissue in the circumference of an X-ray high-absorbent body such as metal in a testee body is highly precisely restored.SOLUTION: Data of paths for transmitting the X-ray high-absorbent bodies 72a, 72b among actual measurement projection data P0 is replaced with data to be estimated based on the circumferential data (S103), thereby reconstituting the tomographic image G1, based on the replaced projection data (S104). Then, processing for obtaining the projection data Pi+1 by successively projecting the tomographic images Gi (i=1, 2, 3, ...) (S106) and processing for reconstituting the tomographic images Gi+1, based on the projection data Pi+1 (S108) are performed n (n&ge1) times, so as to obtain the last tomographic image Gn+1 as the final tomographic image (S111).COPYRIGHT: (C)2009,JPO&INPIT【課題】被検体における金属等のX線高吸収体周辺の組織がより高精度に復元されたX線CT断層像を得る。【解決手段】実測投影データP0のうちX線高吸収体72a,72bを透過するパスのデータをその周辺のデータから推定されるデータに置換し(S103)、置換済投影データから断層像G1を画像再構成する(S104)。その後、断層像Gi(i=1,2,3,…)を順投影して投影データPi+1を得る処理(S106)と、投影データPi+1に基づいて断層像Gi+1を画像再構成する処理(S108)とを、n回(n≧1)行って、最後に得られた断層像Gn+1を最終的な断層像として得る(S111)。【選択図】図2
