JP6746027B1 - 人工知能基盤のパーキンソン病診断装置及び方法 - Google Patents
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Abstract
Description
ここで、Xは、前記ステップ4で計算された量的磁化率値(ppm単位)であり、Xthは、常磁性閾値である。前記閾値は、後で最適なCNRに対するニグロソーム1イメージングデータを使用して決定され得る。
ここで、mは、磁化率加重値に対する掛け算の数であり、magは、前記ステップ2のマルチエコー大きさ結合画像である。
Claims (14)
- 患者の脳を撮影したMRIから、マルチエコー(multi echo)の大きさ及び位相と関連した第1画像を獲得する画像獲得部;
パーキンソン病の画像バイオマーカーとして利用される黒質とニグロソーム1領域の観察が可能であるように、前記獲得した第1画像を後処理する画像処理部;
前記後処理された第1画像を分析して前記ニグロソーム1領域が含まれた第2画像を分類し、前記分類された第2画像から前記ニグロソーム1領域を検出する画像分析部;及び
前記検出されたニグロソーム1領域が正常であるか否かを分析して、前記患者のパーキンソン病の有無を診断する診断部;を含み、
前記画像処理部は、
量的磁化率マッピングアルゴリズムを基盤に、前記第1画像に量的磁化率マップマスクを適用して、磁化率マップ加重イメージング画像を生成することで、前記後処理を遂行し、
前記画像処理部は、
前記生成された磁化率マップ加重イメージング画像に対して、角度調節、画像拡大及び再分割(Reslice)の少なくとも一つの動作をさらに遂行することを特徴とする、人工知能基盤のパーキンソン病診断装置。 - 前記角度調節は、前記ニグロソーム1領域の観察が容易であるように前記生成された磁化率マップ加重イメージング画像のずれを補正する動作であり、
前記画像拡大は、前記ニグロソーム1領域と関連した画像を拡大する動作であり、
前記再分割は、前記ニグロソーム1領域が含まれた前記第1画像の生成個数を増やすための動作であることを特徴とする、請求項1に記載の人工知能基盤のパーキンソン病診断装置。 - 前記画像分析部は、
機械学習を通して前記後処理された第1画像内に存在する赤核(red nucleus)と黒質(substantia nigra)を検出し、
前記第1画像で、前記検出した赤核と黒質のうち前記赤核がなくなる時点の第1イメージを基準に、前記ニグロソーム1領域が含まれた第2画像を分類することを特徴とする、請求項1に記載の人工知能基盤のパーキンソン病診断装置。 - 前記画像分析部は、
前記第1画像のうち、前記第1イメージを基準に一定範囲以内の画像を分析して前記ニグロソーム1領域が含まれた第2画像を分類することを特徴とする、請求項3に記載の人工知能基盤のパーキンソン病診断装置。 - 前記画像分析部は、
機械学習のディープラーニング神経網(deep learnig neural network)を利用した方式のうちワン−ステージディテクター(one−stage detector)方式を利用して、前記ニグロソーム1領域が含まれた第2画像を分類することを特徴とする、請求項1に記載の人工知能基盤のパーキンソン病診断装置。 - 前記画像分析部は、
前記後処理された第1画像に、コンボリューション神経網(Convolutional Neural Network、CNN)を適用して、完全コンボリューションレイヤー(Fully convolution layer)の特徴を有する特徴マップ(feature map)を検出し、
前記特徴マップに、特徴ピラミッド神経網(feature pyramid network、FPN)を適用して多重スケール連結(cross−scale connections)を導出し、
前記多重スケール連結を基盤とした分類結果に対して、分類ロス(classification loss)、バウンディングボックスリグレッションロス(bounding−box regression loss)及び焦点ロス(Focal Loss)を予め設定された基準によって調節することで、前記ニグロソーム1領域が含まれた第2画像を分類することを特徴とする、請求項5に記載の人工知能基盤のパーキンソン病診断装置。 - 前記診断部は、
同じデータセット(Data Set)を基盤に、前記パーキンソン病の有無を診断するための複数の学習モデルを生成し、
前記検出されたニグロソーム1領域を基盤に、前記複数の学習モデルによる複数の予測結果を導出し、
前記複数の予測結果に基づいて前記患者のパーキンソン病の有無を診断することを特徴とする、請求項1に記載の人工知能基盤のパーキンソン病診断装置。 - 前記診断部は、
前記検出されたニグロソーム1領域を基盤に、前記複数の学習モデルによる複数の予測結果に多数決の原則を適用して、多数である予測結果を基盤に前記患者のパーキンソン病の有無を診断することを特徴とする、請求項7に記載の人工知能基盤のパーキンソン病診断装置。 - 画像獲得部が患者の脳を撮影したMRIから、マルチエコー(multi echo)の大きさ及び位相と関連した第1画像を獲得する第1ステップ;
パーキンソン病の画像バイオマーカーとして利用される黒質とニグロソーム1領域の観察が可能であるように、画像処理部が前記獲得した第1画像を後処理する第2ステップ;
画像分析部が前記後処理された第1画像を分析して前記ニグロソーム1領域が含まれた第2画像を分類する第3ステップ;
前記画像分析部が前記分類された第2画像から前記ニグロソーム1領域を検出する第4ステップ;及び
前記患者のパーキンソン病の有無を診断するために、前記検出されたニグロソーム1領域に対する情報を診断部に提供する第5ステップ;を含み、
前記第2ステップで、
前記画像処理部は、量的磁化率マッピングアルゴリズムを基盤に、前記第1画像に量的磁化率マップマスクを適用して、磁化率マップ加重イメージング画像を生成することで、前記後処理を遂行し、
前記第2ステップと前記第3ステップとの間には、
前記画像処理部が前記生成された磁化率マップ加重イメージング画像に対して、角度調節、画像拡大及び再分割(Reslice)の少なくとも一つの動作をさらに遂行する第2.5ステップ;をさらに含むことを特徴とする、パーキンソン病診断のための情報提供方法。 - 前記第2.5ステップで、
前記角度調節は、前記ニグロソーム1領域の観察が容易であるように前記生成された磁化率マップ加重イメージング画像のずれを補正する動作であり、
前記画像拡大は、前記ニグロソーム1領域と関連した画像を拡大する動作であり、
前記再分割は、前記ニグロソーム1領域が含まれた前記第1画像の生成個数を増やすための動作であることを特徴とする、請求項9に記載のパーキンソン病診断のための情報提供方法。 - 前記第3ステップは、
前記画像分析部が、機械学習を通して前記後処理された第1画像内に存在する赤核(red nucleus)と黒質(substantia nigra)を検出する第3−1ステップ;及び
前記画像分析部が、前記第1画像で、前記検出した赤核と黒質のうち前記赤核がなくなる時点の第1イメージを基準に、前記ニグロソーム1領域が含まれた第2画像を分類する第3−2ステップ;をさらに含むことを特徴とする、請求項9に記載のパーキンソン病診断のための情報提供方法。 - 前記第3−2ステップで、
前記画像分析部は、前記第1画像のうち、前記第1イメージを基準に一定範囲以内の画像を分析して前記ニグロソーム1領域が含まれた第2画像を分類することを特徴とする、請求項11に記載のパーキンソン病診断のための情報提供方法。 - 前記第3ステップは、
前記画像分析部が機械学習のディープラーニング神経網(deep learnig neural network)を利用した方式のうちワン−ステージディテクター(one−stage detector)方式を利用して、前記ニグロソーム1領域が含まれた第2画像を分類することを特徴とする、請求項9に記載のパーキンソン病診断のための情報提供方法。 - 前記第3ステップは、
前記画像分析部が、前記後処理された第1画像にコンボリューション神経網(Convolutional Neural Network、CNN)を適用して、完全コンボリューションレイヤー(Fully convolution layer)の特徴を有する特徴マップ(feature map)を検出する第3−1ステップ;
前記画像分析部が、前記特徴マップに特徴ピラミッド神経網(feature pyramid network、FPN)を適用して多重スケール連結(cross−scale connections)を導出する第3−2ステップ;及び
前記画像分析部が、前記多重スケール連結を基盤とした分類結果に対して、分類ロス(classification loss)、バウンディングボックスリグレッションロス(bounding−box regression loss)及び焦点ロス(Focal Loss)を予め設定された基準によって調節することで、前記ニグロソーム1領域が含まれた第2画像を分類する第3−3ステップ;を含むことを特徴とする、請求項13に記載のパーキンソン病診断のための情報提供方法。
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