Xeroradiographyの現像電極効果

概要

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In conventional Xeroradiography, unwanted toner deletion occurs at the edge of high-contrast objects. We adapted a wire grid as a counter-electrode against a selenium plate in order to eliminate this disadvantage and increase the sensitivity. The contrast loss accompanied by excessive toner deposit on the wide solid area was compensated for by way of the following ; First, increasing the subject contrast by lowering the tube voltage or eliminating the scattered radiation with magnification technique. Secondly, reducing the back bias of the development which is much greater than increasing the subject contrast. Our result revealed that the magnification technique could be carried out at the same "mean dose" as that required for the conventional contact technique providing far better visibility of microcalcification but not so much for mass-like tumors. In the non-mammographic region, the patient dose could be reduced to less than half or even to onefifth for cases where the edge effect worked adversely. We concluded that this electrode-Xeroradiography was relevant to improving the image quality with a reduced patient dose.
公益社団法人日本放射線技術学会の論文
1984-05-01