JP2020168353A - 医用装置及びプログラム - Google Patents
医用装置及びプログラム Download PDFInfo
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Abstract
Description
500 ラジオグラフィガントリ
514 再構成回路
840 ガントリ
870 処理部
Claims (14)
- 放射線強度を示す放射線データを取得し、
フィルタの畳み込みカーネルの形状関数を定義する前記フィルタのパラメータを決定するためにトレーニングされた重み付け係数を有するニューラルネットワークを取得し、
前記放射線データを前記ニューラルネットワークに適用することで前記ニューラルネットワークから出力された前記放射線データに基づくパラメータを取得し、
前記ニューラルネットワークから出力されたパラメータによって規定される前記フィルタを適用することにより前記放射線データをフィルタリングして、フィルタリングされた放射線データを生成する回路を備えた、医用装置。 - 前記放射線データは、X線源と検出器との角度を撮像対象に対して回転させた一連の投影ビューでX線投影画像を生成することにより得られるサイノグラムであり、
前記回路は、前記ニューラルネットワークから出力された前記パラメータにより規定される前記フィルタを適用することにより前記サイノグラムをノイズ除去することで、ノイズ除去されたサイノグラムを生成する、請求項1に記載の医用装置。 - 前記回路は、セグメントディメンションおよびチャネルディメンション、ビューディメンションおよびチャネルディメンション、および/またはセグメントディメンションおよびビューディメンションを有する、前記サイノグラムの三次元ボリュームまたは前記サイノグラムの二次元スライスに対して前記フィルタを適用する、請求項2に記載の医用装置。
- 前記放射線データは、X線断層撮影(Computed Tomography(CT))データ、X線蛍光透視法データ、ガンマ線ポジトロン断層撮影(Positron Emission Tomography:PET)、および単一光子放射断層撮影(Single−photon Emission CT:SPECT)のうちの一つである、請求項1に記載の医用装置。
- 前記回路は、更に、分析再構成法を用いて、前記ノイズ除去されたサイノグラムから断層撮影(Computed Tomography:CT)画像を再構成する、請求項2又は3に記載の医用装置。
- 前記フィルタは、円滑フィルタであり、
前記回路は、前記放射線データをフィルタリングすることで前記放射線データをノイズ除去する、請求項1〜5のいずれか一項に記載の医用装置。 - 前記円滑フィルタの前記形状関数は、多変量ローパスフィルタカーネルであり、
前記円滑フィルタの前記パラメータは、多変量ローパスフィルタカーネルの幅と向きを規定する値からなり、
前記パラメータからなる前記値は、前記放射線データ内で画素位置の関数として変化する、請求項6に記載の医用装置。 - 前記多変量ローパスフィルタカーネルは、多変量ガウス分布である、請求項7に記載の医用装置。
- 前記フィルタは、セグメント次元およびチャネル次元、ビュー次元および前記チャネル次元、または前記ビュー次元および前記セグメント次元に沿って前記放射線データの二次元スライスに適用される二次元フィルタである、請求項1に記載の医用装置。
- 前記重み付け係数は、入力データおよび対象データを含むトレーニングデータを用いてトレーニングされており、
前記入力データは、第1放射線量を用いて取得される第1トレーニングサイノグラムからなり、
前記対象データは、前記第1放射線量より大きい第2放射線量を用いて取得される第2トレーニングサイノグラムからなる、請求項2又は3に記載の医用装置。 - 前記回路は、
対象サイノグラムと、対応の対象サイノグラムよりも大きいノイズを示す入力サイノグラムとの対を含んだトレーニングデータセットを取得し、
前記重み付け係数を反復して調整することで前記ニューラルネットワークをトレーニングし、前記対象サイノグラムと、前記入力サイノグラムを適用することで前記ニューラルネットワークから出力されたサイノグラムとの不一致を示す損失関数の値を最少化する、請求項2又は3に記載の医用装置。 - 前記損失関数は、ピーク信号対ノイズ比、構造類似性インデックス、および/または前記対象サイノグラムと前記入力サイノグラムを適用することで前記ニューラルネットワークから出力されたサイノグラムとの差のLpノルムを有する、請求項11に記載の医用装置。
- 前記回路は、更に、前記フィルタを用いて前記入力サイノグラムの一つをフィルタリングするように構成され、
前記フィルタは、前記畳み込みカーネルが前記入力サイノグラムの一つの中の位置関数として変化することで前記入力サイノグラムの一つで示される特徴に適応する適応フィルタである、請求項11に記載の医用装置。 - 放射線強度を示す放射線データを取得し、
フィルタの畳み込みカーネルの形状関数を定義する前記フィルタのパラメータを決定するためにトレーニングされた重み付け係数を有するニューラルネットワークを取得し、
前記放射線データを前記ニューラルネットワークに適用することで前記ニューラルネットワークから出力された前記放射線データに基づくパラメータを取得し、
前記ニューラルネットワークから出力されたパラメータによって規定される前記フィルタを適用することにより前記放射線データをフィルタリングして、フィルタリングされた放射線データを生成する、
各処理をコンピュータに実行させる、プログラム。
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Cited By (3)
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KR20220073156A (ko) * | 2020-11-26 | 2022-06-03 | 건양대학교산학협력단 | 딥 러닝 기반의 제한각도 컴퓨터 단층촬영상 재구성 시스템 |
US11540798B2 (en) | 2019-08-30 | 2023-01-03 | The Research Foundation For The State University Of New York | Dilated convolutional neural network system and method for positron emission tomography (PET) image denoising |
KR20240038339A (ko) * | 2022-09-16 | 2024-03-25 | 연세대학교 원주산학협력단 | 구급차용 뇌 ct 촬영 시스템 및 그 방법 |
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JP6333871B2 (ja) * | 2016-02-25 | 2018-05-30 | ファナック株式会社 | 入力画像から検出した対象物を表示する画像処理装置 |
US11176428B2 (en) * | 2019-04-01 | 2021-11-16 | Canon Medical Systems Corporation | Apparatus and method for sinogram restoration in computed tomography (CT) using adaptive filtering with deep learning (DL) |
JP7292184B2 (ja) * | 2019-11-11 | 2023-06-16 | 富士フイルム株式会社 | 学習装置、学習方法および学習済みモデル |
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