Publication Information

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'referenced_works': ['https://openalex.org/W2411288704', 'https://openalex.org/W39741010'], 'related_works': ['https://openalex.org/W4231903370', 'https://openalex.org/W3202310634', 'https://openalex.org/W2358878213', 'https://openalex.org/W2349347038', 'https://openalex.org/W2298446004', 'https://openalex.org/W2108288648', 'https://openalex.org/W2101003414', 'https://openalex.org/W2088219151', 'https://openalex.org/W2047828326', 'https://openalex.org/W1991686431'], 'abstract_inverted_index': {'ディジタル撮影装置であるcomputed': [0], 'radiography(CR)は,サンプリングされた信号値の自由なコントロールが可能になり初めてそのディジタル化が意味を持つ.また,多くのデータをいかに効率よくコントロールするのかも重要な問題である.そのため,CRの階調処理には,画像認識機能を取り入れた自動階調処理が備えられ,階調タイプに適した読み取りラチチュードと感度値を与えてくれる.これらのパラメータから得られるCRの特性曲線を測定することは,画像評価や,フィルム・スクリーンシステムとの比較,異機種間での比較には必要な情報の一つである.CRは,IP(imaging': [1], 'plate)のデータを読み取り,ディジタル値に変換するが,その後は,数値計算となる.入力データが既知で,出力データが取り出せるのならば,入出力の関係から,その内部処理が明らかになり,階調カーブが推測可能と考えられる.今回Digital': [2], 'Test': [3, 5], 'Pattern法により,階調カーブの測定およびシミュレーションを行った.Digital': [4], 'Pattern法とは,binary': [6], 'editorを使用しパーソナルコンピュータで作製したステップパターンをCR本体に人力し,ハードコピーおよび出力ファイルで取り出すことにより階調カーブを測定する方法である.本報告での階調カーブとは,入力信号値から換算される仮想的な露光量(以下,実際の相対露光量とは区別するために,仮想露光量とする)とフィルム濃度の関係を表すものであり,相対X線量対出力信号値(pixel': [7], 'value)で表されるdigital特性曲線,入力信号値対フィルム濃度を表すキャリブレーションカーブ,ならびに,相対X線量対フィルム濃度を表すオーバーオール特性曲線とは区別した^<1〜3)>.': [8]}, 'cited_by_api_url': 'https://api.openalex.org/works?filter=cites:W2408475631', 'counts_by_year': [], 'updated_date': '2024-12-10T23:32:54.645515', 'created_date': '2016-06-24'}