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タイトル別名
  • DIAGNOSTIC APPLICATION OF LINEAR ACCELERATOR-RADIOGRAPHY (LINACGRAPHY)
  • ライナッタグラフイー

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Our hospital established the equipment of Toshiba's linear accelerator (LMR-13) in 1968. The maximum energy of this machine is 13 MeV and it's maximum output is 500R/min. We investigated the technical feasibility of supervoltage roentgenography (linacgraphy), because we thought that the linacgraphy would be utilized widely in diagnostic field in future. The purpose of our study is to improve the quality of linacgraphy in order to increase it's clinical value. Here we report the results of experiment as follows : 1. The energy of linacgraphy, we ordinarily use, is 6 MeV and the exposure conditions are for various regions as follows : chest posterior-anterior 0.15-0.2 sec., lateral 0.2-0.25 sec., nasopharynx 0.15 sec. The target-film distance is 2 meter. The patient receives for a chest exposure less than 1R. The X-ray beam is horizontlly directed in most examinations with up-right position. 2. We use an industrial film, Fuji type 100 and intensifying screens with lead foil 0.1〜0.5mm thickness (Kyokko GS or Toshiba RS). The lead foil reduces the number of very low energy of scattering reaching the film, in order to increase the quality of the linacgraphy. 3. The size of the focal spot of target is an important factor to produce sharpness of X-ray image. Our machine has a focal spot 3×5mm^2 in size. 4. We made a radiograpic filter for our diagnostic use instead of a therapeutic flatness filter. When we use it, we get higher out-put than ever. In conclusion, we describe the advantage of linacgraphy that the shadow of bone are reduced to a minimum and the shadows of underlying soft tissue or air-containing structure are better visualized. That is to say, it is possible to record clearly the structures of the mediastinum without losing any significant detail in the lung fields.

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