1. X 線フィルムディジタル化での問題点と画像処理(ディジタル画像についての現状, 問題点, 将来展望)

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Aiming at the realization of PACS, a study was conducted on the present state of, and various problems associated with, X-ray film digitization using a He-Ne laser-type film digitizer. Image quality was evaluated physically and clinically. With regard to the gradation specificity, the linear specificity was shown in a dynamic range of 4 figures. With regard to resolution specificity, visual evaluation was performed using a Hawlet Chart, with almost no difference being found between the CRT and laser printer output images and the decrease in resolution becoming more pronounced as the sampling pitch became greater. Clinical evaluation was performed with reference to the literature. The general evaluation of the clinicians was that although there was some deterioration for all of the shadows, (I have read this many times, but can't understood the last part.) by performing each of the kinds of image-processing enhancement of diagnostic ability was achieved, with a diagnosis being possible. The problem of unhindered diagnosis due to the development of artifacts from optical interference of the grid images projected onto the clinical pictures and digitizer sampling pitch was studied. As countermeasures, the use of a highdensity grid and adoption of a low-pass filter were useful in impeding the development of artifacts. Regarding the operating problems, the inputting of index information requires a considerable number of manhours and a method of automatic recognition from digital data was introduced to overcome this problem. As future prospects, the concepts of a practical system of X-ray film digitization and a film-screen system adapted to digitization were described.
公益社団法人日本放射線技術学会の論文
1992-11-01

1. X 線フィルムディジタル化での問題点と画像処理(ディジタル画像についての現状, 問題点, 将来展望)

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