| 摘要 |
PROBLEM TO BE SOLVED: To allow an accurate CT reconstruction, using a light condensing device such as a lens with a large opening diameter. SOLUTION: A method for reconstructing a distribution of a luminance or a logarithm absorption volume in an observation area from a projection data group 38 obtained with the light condensing device, using a MLEM method, includes steps of: obtaining projection data arranged at each projection principle 43 and subdivided projection data from an opening distribution of each projection principle 43 to arrange the projection data arranged at each projection principle 43 in a reconstruction area 41 along many back projection beams 48 passing through a lens principle dividing an opening area of a lens 40 from the projection principle 43, refracted and extending; and distributing this subdivided projection data to all square pixels in the reconstruction area 41 through which the back projection beams 48 pass, according to a product of a CT value of the respective square pixels and a beam pass area. COPYRIGHT: (C)2011,JPO&INPIT
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