FCRによる胸部のOne Shot Dual Energy Subtractionについて

概要

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One shot dual energy subtraction for chest using the FCR, IP (Imaging Plate) system that Fuji Photo Film CO., LTD. developed, was tested and the possibility of utilizing this method clinically was investigated. Putting three IPs to the IP cassette, and then putting filter material of Cu 1 mm or Sn 0.3 mm between the first layer and second layer, we took a radiograph of the chest. This method is, using the change of beam quality by absorption which is peculiar to each material, to get the energy subtraction image. Energy difference between them is about 20 keV using the Cu 1 mm or Sn 0.3 mm filter. Incident dose is increased because the radiation dose of the second layer is decreased by the absorption of the filter. However we can get a clinically significant subtraction image by image processing which uses the weighting factor to the subtraction. This method, compared with cassette changer method, has no motion artifact by time lag, phase of breath and phase of heartbeat, so it is suitable to be used for moving organs. We cannot draw a conclusion from clinical evaluation of thoracic subtraction, because it is still in the experimental stage. However we expect that it will be one of the effective methods for diagnosing diffuse lung diseases.
社団法人日本放射線技術学会の論文
1985-11-01