X線撮影系のレスポンス関数:(III)被写体および運動
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概要
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Two dimensional X-ray image-let it be called the effective object-is calculated from a three dimensional real object by introducing a discrete strata model. Fourier spectrum of the effective object can be obtained in spatial frequency domain from an equation by taking into account the optical transfer functions of the focal spot of X-ray tube. Comparisons between calculated and observed X-ray images for cylindrical and square objects show good correspondence. X-ray images formed in tomography are obtained by the discrete strata model with optical transfer functions of image motions, and the transfer functions are shown to be obtainable by two derived equations from the locus of a point image. The blurred effects of the X-ray image by image motions are discussed for a linear motion, a circular motion and a discrete motion by using single figures of merits for image evaluation. The discrete motion may be concluded to be the most effective motion in tomography.
- 公益社団法人 応用物理学会の論文
公益社団法人 応用物理学会 | 論文
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