THE METHOD OF THE IMPROVEMENT OF UNEVEN DENSITY OF THE ROENTGENOGRAM

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  • X線写真の濃度不均一を改善する方法
  • Xセン シャシン ノ ノウド フキンイツ オ カイゼン スル ホウホウ

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The factors which are reported to cause the uneven density of roentgenogram are 1) geometrical condition, 2) sensitive material and procedures of development, 3) effect of scattering X-rays and 4) individual difference in the subjects to be photographed. By improving these difficuties to attain uniform density, the progress can be expected in the application of X-ray to wider ranges of diagnoses. For this purpose, teleroentgenography, use of low gamma film the selection of developer and use of the compensatory intensifying screen or a rectifying filter, etc. have been attempted. We have also developed a movable rectifying filter. We reported on the factors producing uneven density of roentgenogram and on the method to improve it.

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