The Streak Artifact Reduction Effect by Using the Hybrid IR in Low Dose Chest CT:

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  • Hybrid IRによる低線量胸部CT画像のストリークアーチファクト低減効果
  • Hybrid IRによる低線量胸部CT画像のストリークアーチファクト低減効果 : 極値統計Gumbel法による定量評価
  • Hybrid IR ニ ヨル テイセンリョウ キョウブ CT ガゾウ ノ ストリークアーチファクト テイゲン コウカ : ゴクチ トウケイ Gumbelホウ ニ ヨル テイリョウ ヒョウカ
  • Quantitative Evaluation by Gumbel Method of Extreme Value Analysis
  • ―極値統計Gumbel法による定量評価―

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Abstract

<p>Objective: To clarify the characteristics of hybrid IR-based streak artifact (SA)-reduction effects by conducting quantitative evaluations using the Gumbel method on lung field SAs in low-dose chest CT images.</p><p>Methods: The superior lobes of anthropomorphic phantoms in the chest were imaged (tube current: 10–50mA) using a 16DAS CT Alexion device (Canon Medical Systems). Each evaluated image was obtained using the following six reconstruction methods: original image, ORG; conventional SA-reduction method, Boost3D; hybrid IR: AIDR 3D (preset strengths: four types). ROIs were set within the lung field (SAs included) of each image, and the correlation coefficients from the obtained Gumbel plots were used to determine the suitability of the Gumbel method for quantitative analysis of the lung field SAs. Hybrid IR-based SA reduction effects were also analyzed from the positional parameters in each image.</p><p>Results: The correlation coefficients r of the Gumbel plots for all the evaluated images were in the range 0.963 ≦ r ≦ 0.997, and the Gumbel properties were confirmed due to r ≒ 1. The positional parameters for hybrid IR were lower than those with the conventional method, and furthermore, those values were also independent of the tube current and were constant for each preset strength.</p><p>Conclusion: The Gumbel method can be applied for the quantitative evaluations of lung field SAs in low-dose chest CT images. Hybrid IR was also able to further reduce the SAs, as compared to the conventional method, and was shown to be more effective with lower doses.</p>

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