胸椎撮影用フィルターについて : paper filterの使用

概要

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We devised the radiographic filters which used for thoracic vertebrae antero-posterior or lateral position to get obstacle densities out, thoracic region was overshadowed by the super-imposition of the air-filled lungs. The paper filters were filter papers to be penetrated water soluble opaque mediuem Gastrografin. It was same effective as Aluminim's O.5mm thickness to absorptived X-ray doses, further it was easy to manufacture. 1. The shape of compensating paper fillter for thoracic vertebrae antero-posterior made according to the density distribution image. This utilized 27 pieces of papers to be able to obtain the same average film density. This paper filter placed between X-ray tube and the object. 2. The second was designed the paper filter of lower thoracic vertebrae (11th, 12th) lateral. The lateral image was shown overshadowed through the air-filled lungs but 1st lumbar vertebrae observed undershadowed so that compensating paper filter might used nessarey adjustment in the density more uniform. It would needed 17 pieces of papers. This results showed that these compensating filters employed up at clinical, image quality improved better detail and satisfactorily than without it as before.
公益社団法人日本放射線技術学会の論文
1972-09-30