Wiener Spectrum and Relative Electron Density Resolution in Heavy Ion CT Based on Measurement of Residual Range Distribution

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  • 残留飛程分布の測定による重イオン線CTのウィナースペクトルと相対電子密度分解能
  • ザンリュウ ヒテイ ブンプ ノ ソクテイ ニ ヨル ジュウ イオンセン CT ノ ウィナースペクトル ト ソウタイ デンシ ミツド ブンカイノウ

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Abstract

The relative electron density resolution was discussed by the Wiener spectrum in the heavy ion CT image. The two dimensional (2D) Wiener spectrum in the CT image was obtained from the one dimensional (1D) Wiener spectrum of the measured residual range distribution of the water phantom for a single projection angle, and the relative electron density resolution in the CT image was calculated from the 2D Wiener spectrum. To examine the usefulness of this method, the relative electron density resolution was also estimated by other two methods; the calculation using the Wiener spectrum of the reconstructed image of the water phantom, and the estimation by the reconstructed image of the electron density resolution phantom. The result of the first method was similar to those of the other two methods. Therefore, it is useful to estimate the relative electron density resolution by the 1D Wiener spectrum of the measured residual range distribution of the water phantom for a single projection angle.

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