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X-rays were discovered on November 8, 1895 by Rontgen, who conducted an experiment with cathode-rays using a Crookes tube and an induction coil. He found that straight beams produce light on a fluorescent material, and named these unknown straight-travelling rays X-rays. Later he produced a silhouette of his own fingers; and thus it is said that the first image with medical applications was made. It is well know that one of the three elements necessary for producing X-rays, the X-ray tube - a glass (metal) tube - plays an important role in that it makes the image by setting boundaries which define the physical characteristics of the object being exmained. This paper investigates - recognizing the enigma harbored in the glass tube, praising the accomplishments of the pioneers and seeking out additional values - the progression to the ideal image, namely, from a simple visual image to a research image; that is to say, an investigative image was considered using spatial resolution, density resolution and temporal resolution, which are the vital elements of an image, as their indicators for observation. Showing the development of a simple radiograph image, contrasted image, CR image, X-ray CT image, MPR image, 3-D image, slicing image and fluid image, we recognized anew the method of coming to terms with the academic specialty at the time X-rays of X-ray CT was discovered. Image quality and the way of clarifying image research in the future was then demonstrated using the example of a "rose flower" and we confirmed that no errors were found compared with the actual images. We also showed the usefulness of image quality and image focusing for clinical applications. It was corroborated that research results are born based on the continuous accumulation of daily efforts and broadly based overall scholarship and techniques.
公益社団法人日本放射線技術学会の論文
1988-09-01

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