Variation of Wiener Spectra in Contents of Scattered Radiation

概要

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The visual perception of image signals in radiography are greatly deteriorated because scattered radiation causes a low contrast image. The contrast immediately decreases the value of from 1.0 to 0.3when the content of scattered radiation changes from 0 to 0.5. In the report, the Wiener spectra were determined by different a content of the scattered radiation controlled field size. Magnitude of the Wiener spectrum at a large field size(300×300mm2)is 1ower than those at small(40×40mm2), and slit(4×300mm2)field sizes up to the spatial the spatial frequency of 10 cycles/mm. X-ray absorption with a screen at a large field size is 0.361 and at a small field is 0.285.Namely, alot of X-ray absorption at a large field size leads a low quantum mottle.
Medical Imaging and Information Sciencesの論文