| 摘要 |
PROBLEM TO BE SOLVED: To provide a perspective imaging method related to perspective imaging represented by X-ray CT imaging and capable of estimating the density of the constituent material of an object with sufficiently high precision even if the irregularity of the emitting intensities of radiation is large because of the low emitting intensities thereof. SOLUTION: In the perspective imaging method, an object P is irradiated wich radiation a plurality of times in the same route and the emission intensities of the radiation from the object in a plurality of irradiations are measured by X-ray sensors D1-Dn. The attenuation quantities of radiation due to the object are calculated in a plurality of irradiations from the emission intensities by a division means 11 and a logarithmic operational means 12 and the average value of the attenuation quantities is calculated. The density distribution of the cross section of the object is estimated based on the average attenuation quantity to form a perspective image. In this perspective imaging method, the average value and deviation of emission intensities in repeated irradiation are calculated by an irregularity measuring means 13 and used to correct the average attrenuation quantity. COPYRIGHT: (C)2005,JPO&NCIPI
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