散乱線除去効果のMTF

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タイトル別名
  • MODULATION TRANSFER FUNCTION OF ELIMINATING EFFECT OF SCATTERED RADIATION BY MEANS OF X-RAY GRIDS
  • サンランセン ジョキョ コウカ ノ MTF

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抄録

Efficiency of X-ray grids has a great influence on the image quality in radiograph. Nowadays, the efficiency of X-ray grids is individually estimated by contrast improvement factor, Bucky factor and etc. Contrast improvement factor causes bring about errors by measurement methods. Therefor, contrast improvement factor is not a good method of valuation. Let Modulation Transfer Function (MTF) of phantom-X-ray grids system and MTF of scattered X-ray from phantom be replaced temporally by A_1(ω), A_2(ω) respectively. MTF of eliminating effect by means of X-ray grids is obtained theoretically by the following equation. C(ω)=A_1(ω)/A_2(ω)……(1) If the efficiency of X-ray grids is estimated by MTF, eliminating effect by X-ray grids can be estimated quantitatively at every spatial frequency. And also, the efficiency of X-ray grids which has the same grids ratio and different grid density can be estimated quantitatively by MTF. By difference of MTF, we can know how to use X-ray grids.

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