JP6793469B2 - データ処理装置、x線ct装置及びデータ処理方法 - Google Patents
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Description
以下、添付図面を用いて、実施形態に係るデータ処理装置、X線CT装置及びデータ処理方法を詳細に説明する。
として計算され、物質成分画像RI(m)(i、j、k)が、以下の式(13)により、無相関基底の画像U(m)(i、j、k)に変換される。
PCD1 光子計数型検出器
PCD2 光子計数型検出器
PCDN 光子計数型検出器
Claims (16)
- 複数のエネルギー成分を有する投影データに基づいて、物質弁別されたデータである第1のデータを生成し、前記第1のデータをホワイトニング変換により無相関基底に変換する処理を前記第1のデータに対して行って第2のデータを生成し、前記第2のデータに対してノイズ除去処理を行って第3のデータを生成し、前記第3のデータに対して前記変換の逆変換を行って第4のデータを生成する処理回路を備えるデータ処理装置。
- 前記第1のデータは、物質成分画像及び物質成分サイノグラムのうちいずれかである、請求項1に記載のデータ処理装置。
- 前記処理回路は、最小標準偏差に対応するX線エネルギーでのそれぞれの物質の吸収係数の値を要素にもつ行列を前記第1のデータに乗じることにより、前記第2のデータを生成する、請求項1に記載のデータ処理装置。
- 前記処理回路は、前記第1のデータに対する前記変換を、パッチごとに行う、請求項1に記載のデータ処理装置。
- 前記ノイズ除去処理は、ペナルティ付き加重最小二乗法(Peneralized Weighted Least Square:PWLS)である、請求項1に記載のデータ処理装置。
- 前記処理回路は、二次正則化を用いて前記ノイズ除去処理を行う、請求項1に記載のデータ処理装置。
- 前記処理回路は、前記無相関基底の各成分間で異なるノイズ除去パラメータを用いて前記ノイズ除去処理を行う、請求項1に記載のデータ処理装置。
- 前記処理回路は、前記投影データに対して物質弁別処理を行ってサイノグラムを生成し、生成されたサイノグラムごとに再構成処理を行って、物質成分画像である前記第1のデータを生成する、請求項1に記載のデータ処理装置。
- 前記第1のデータは、物質成分サイノグラムであり、
前記処理回路は、前記第4のデータであるノイズが除去された物質成分サイノグラムごとに、再構成処理を行って、物質成分画像を生成する、請求項1に記載のデータ処理装置。 - X線を照射するX線源と、
照射された前記X線を検出する複数の検出器要素と、
前記複数の検出器要素の検出結果に基づいて生成された複数のエネルギー成分を有する投影データに基づいて、物質弁別されたデータである第1のデータを生成し、前記第1のデータをホワイトニング変換により無相関基底に変換する処理を前記第1のデータに対して行って第2のデータを生成し、前記第2のデータに対してノイズ除去処理を行って第3のデータを生成し、前記第3のデータに対して前記変換の逆変換を行って第4のデータを生成する処理回路とを備えるX線CT装置。 - 前記処理回路は、前記投影データに対して物質弁別処理を行ってサイノグラムを生成し、生成されたサイノグラムごとに再構成処理を行って、物質成分画像である前記第1のデータを生成する、請求項10に記載のX線CT装置。
- 前記第1のデータは、物質成分サイノグラムであり、
前記処理回路は、前記第4のデータであるノイズが除去された物質成分サイノグラムごとに、再構成処理を行って、物質成分画像を生成する、請求項10に記載のX線CT装置。 - 複数のエネルギー成分を有する投影データに基づいて、物質弁別されたデータである第1のデータを生成し、前記第1のデータをホワイトニング変換により無相関基底に変換する処理を前記第1のデータに対して行って第2のデータを生成し、前記第2のデータに対してノイズ除去処理を行って第3のデータを生成し、前記第3のデータに対して前記変換の逆変換を行って第4のデータを生成するデータ処理方法。
- 前記第1のデータは、物質成分サイノグラム又は物質成分画像のいずれかである、請求項13に記載のデータ処理方法。
- 前記第1のデータは、物質成分サイノグラムであり、
前記第4のデータであるノイズが除去された物質成分サイノグラムごとに、再構成処理を行って、物質成分画像を更に生成する、請求項13に記載のデータ処理方法。 - 前記変換は、前記第1のデータの共分散行列に基づいて定められた変換である、請求項14に記載のデータ処理方法。
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US10403006B2 (en) * | 2016-08-26 | 2019-09-03 | General Electric Company | Guided filter for multiple level energy computed tomography (CT) |
US10096109B1 (en) * | 2017-03-31 | 2018-10-09 | The Board Of Trustees Of The Leland Stanford Junior University | Quality of medical images using multi-contrast and deep learning |
US10475214B2 (en) * | 2017-04-05 | 2019-11-12 | General Electric Company | Tomographic reconstruction based on deep learning |
US10803984B2 (en) | 2017-10-06 | 2020-10-13 | Canon Medical Systems Corporation | Medical image processing apparatus and medical image processing system |
US11517197B2 (en) | 2017-10-06 | 2022-12-06 | Canon Medical Systems Corporation | Apparatus and method for medical image reconstruction using deep learning for computed tomography (CT) image noise and artifacts reduction |
KR101982941B1 (ko) * | 2017-12-18 | 2019-08-28 | 연세대학교 원주산학협력단 | 퍼지 신경망을 이용한 ct 영상의 허상 제거 방법 및 장치 |
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