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翻訳と辞書　辞書検索 [ 開発暫定版 ] スポンサード リンク Interior reconstruction ： ウィキペディア英語版 Interior reconstruction In iterative reconstruction in digital imaging, interior reconstruction (also known as limited field of view (LFV) reconstruction) is a technique to correct truncation artifacts caused by limiting image data to a small field of view. The reconstruction focuses on an area known as the region of interest (ROI). Although interior reconstruction can be applied to dental or cardiac CT images, the concept is not limited to CT. It is applied with one of several methods. ==Methods== The purpose of each method is to solve for vector $x$ in the following problem: :$$ \begin f \\ g \end= \begin A & B \\ C & D \end \begin x \\ y \end. Let $X$ be the region of interest (ROI) and $Y$ be the region outside of $X$. Assume $A$, $B$, $C$, $D$ are known matrices; $x$ and $y$ are unknown vectors of the original image, while $f$ and $g$ are vector measurements of the responses ($f$ is known and $g$ is unknown). $x$ is inside region $X$, ($x\; \backslash in\; X$) and $y$, in the region $Y$, ($y\; \backslash in\; Y$), is outside region $X$. $f$ is inside a region in the measurement corresponding to $X$. This region is denoted as $F$, ($f\; \backslash in\; F$), while $g$ is outside of the region $F$. It corresponds to $Y$ and is denoted as $G$, ($g\; \backslash in\; G$). For CT image-reconstruction purposes, $C\; =\; 0$. To simplify the concept of interior reconstruction, the matrices $A$, $B$, $C$, $D$ are applied to image reconstruction instead of complex operators. The first interior-reconstruction method listed below is extrapolation. It is a local tomography method which eliminates truncation artifacts but introduces another type of artifact: a bowl effect. An improvement is known as the adaptive extrapolation method, although the iterative extrapolation method below also improves reconstruction results. In some cases, the exact reconstruction can be found for the interior reconstruction. The local inverse method below modifies the local tomography method, and may improve the reconstruction result of the local tomography; the iterative reconstruction method can be applied to interior reconstruction. Among the above methods, extrapolation is often applied. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Interior reconstruction」の詳細全文を読む スポンサード リンク 翻訳と辞書 : 翻訳のためのインターネットリソース Copyright(C) kotoba.ne.jp 1997-2016. All Rights Reserved.