JP7553472B2 - 機械学習に基づく脱分極の識別および不整脈の位置特定の可視化 - Google Patents
機械学習に基づく脱分極の識別および不整脈の位置特定の可視化 Download PDFInfo
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Description
Claims (14)
- 医療デバイスシステムであって、
医療デバイスであって、
複数の電極を介して患者の心臓電位図を感知することと、
エピソードのエピソードデータを記憶することであって、前記エピソードが、ある期間に関連付けられ、前記エピソードデータが、前記期間中に前記医療デバイスによって感知された前記心臓電位図を含む、記憶することと、を行うように構成された、医療デバイスと、
処理回路であって、
前記エピソードデータを受信することと、
1つ以上の機械学習モデルを前記エピソードデータに適用することであって、前記1つ以上の機械学習モデルが、複数の不整脈タイプ分類の各々についてそれぞれの尤度値を出力するように構成され、前記尤度値の各々が、前記それぞれの不整脈タイプ分類が前記期間中の任意の時点において発生した尤度を表す、適用することと、
前記エピソードデータへの前記1つ以上の機械学習モデルの前記適用に基づいて、前記不整脈タイプ分類の各々について、前記期間にわたる前記それぞれの不整脈タイプ分類の様々な尤度を示すクラス活性化(class activation)データを導出することと、
前記期間にわたる前記不整脈タイプ分類の前記様々な尤度のグラフをユーザに表示することと、を行うように構成された、処理回路と、を備え、
前記1つ以上の機械学習モデルが、1つ以上の不整脈分類機械学習モデルを含み、前記
1つ以上の不整脈分類機械学習モデルが、前記複数の不整脈タイプ分類の各々について、不整脈タイプ尤度値のそれぞれのセットを出力するように構成され、前記セットの前記不整脈タイプ尤度値の各々が、前記それぞれの不整脈タイプ分類が前記期間中のそれぞれの時間に発生した尤度を表し、
前記処理回路は、
1つ以上の脱分極検出機械学習モデルを前記エピソードデータに適用することであって、前記1つ以上の脱分極検出機械学習モデルが、脱分極尤度値のセットを出力するように構成され、前記セットの前記脱分極尤度値の各々が、脱分極が前記期間中のそれぞれの時間に発生した尤度を表す、適用することと、
前記不整脈タイプ尤度値および前記脱分極尤度値に基づいて、前記エピソード中に1つ以上の脱分極を識別することと、を行うように構成された、医療デバイスシステム。 - 前記処理回路が、前記心臓電位図と併せて前記グラフを表示するように構成された、請求項1に記載の医療デバイスシステム。
- 前記処理回路が、少なくとも1つの不整脈タイプ分類についての前記グラフ上の他の時間に対して、前記不整脈タイプ分類のうちの前記少なくとも1つについてのより高い尤度の少なくとも1つの時間を前記グラフ上に示すように構成された、請求項1または2に記載の医療デバイスシステム。
- 前記処理回路が、
前記1つ以上の機械学習モデルの前記出力に基づいて、前記少なくとも1つの不整脈タイプ分類が前記期間中の任意の時点において発生したことを示すことと、
前記少なくとも1つの不整脈タイプ分類が前記期間中の任意の時点において発生したことを示すことに応答して、前記少なくとも1つの不整脈タイプ分類についてのより高い尤度の少なくとも1つの時間を前記グラフ上に示すことと、を行うように構成された、請求項3に記載の医療デバイスシステム。 - 前記複数の不整脈タイプ分類が、複数の徐脈(bradycardia)、休止、心室性頻脈、心室
細動、上室性頻脈、心房細動、心房性フラッター(flutter)、洞性(sinus)頻脈、心室性期外収縮、心房性期外収縮、広範囲の複雑な頻脈、および房室ブロックを含む、請求項1~4のいずれかに記載の医療デバイスシステム。 - 前記1つ以上の機械学習モデルの各々が、複数の層を含み、前記クラス活性化データを導出することが、前記複数の層のうちの中間層の出力から前記クラス活性化データを導出することを含む、請求項1~5のいずれかに記載の医療デバイスシステム。
- 前記中間層が、グローバル平均プーリング層(global average pooling layer)を含む、請求項6に記載の医療デバイスシステム。
- 前記1つ以上の不整脈分類機械学習モデルの各々が、複数の層を含み、前記処理回路が、前記不整脈タイプ尤度値のセットを、前記複数の層のうちの中間層の出力から導出するように構成された、請求項1~7のいずれかに記載の医療デバイスシステム。
- 前記不整脈タイプ尤度値および前記脱分極尤度値に基づいて前記1つ以上の脱分極を識別するために、前記処理回路が、前記1つ以上の脱分極検出機械学習モデルを前記エピソードデータおよび前記不整脈タイプ尤度値に適用するように構成された、請求項1~8のいずれかに記載の医療デバイスシステム。
- 前記不整脈タイプ尤度値および前記脱分極尤度値に基づいて前記1つ以上の脱分極を識別するために、前記処理回路が、
前記不整脈タイプ尤度値のうちの1つ以上に基づいて前記脱分極尤度値のうちの1つ以上を変更すること、または
前記不整脈タイプ尤度値のうちの1つ以上に基づいて脱分極尤度閾値を変更すること、のうちの少なくとも1つを行うように構成された、請求項1~9のいずれかに記載の医療デバイスシステム。 - 前記処理回路が、前記不整脈タイプ尤度値に基づいて、複数の脱分極タイプのうちの1つとして、前記1つ以上の識別された脱分極の各々にラベル付けするように構成され、前記複数の脱分極タイプが、複数の正常、心室性期外収縮、心房性期外収縮、ノイズ、またはアーチファクトを含む、請求項1~10のいずれかに記載の医療デバイスシステム。
- 前記処理回路が、コンピューティングデバイスの処理回路を含む、請求項1~11のいずれかに記載の医療デバイスシステム。
- 前記医療デバイスが移植可能である、請求項1~12のいずれかに記載の医療デバイスシステム。
- 命令を含む非一時的コンピュータ可読媒体であって、前記命令が、コンピューティングシステムの処理回路によって実行されたとき、前記コンピューティングシステムに、
患者の医療デバイスによって記憶されたエピソードのエピソードデータを受信することであって、前記エピソードが、ある期間に関連付けられ、前記エピソードデータが、前記期間中に前記医療デバイスによって感知された心臓電位図を含む、受信することと、
1つ以上の機械学習モデルを前記エピソードデータに適用することであって、前記1つ以上の機械学習モデルが、複数の不整脈タイプ分類の各々についてそれぞれの尤度値を出力するように構成され、前記尤度値の各々が、前記それぞれの不整脈タイプ分類が前記期間中の任意の時点において発生した尤度を表す、適用することと、
前記エピソードデータへの前記1つ以上の機械学習モデルの前記適用に基づいて、前記不整脈タイプ分類の各々について、前記期間にわたる前記それぞれの不整脈タイプ分類の様々な尤度を示すクラス活性化データを導出することと、
前記期間にわたる前記不整脈タイプ分類の前記様々な尤度のグラフを表示することと、を行わせ、
前記1つ以上の機械学習モデルが、1つ以上の不整脈分類機械学習モデルを含み、前記
1つ以上の不整脈分類機械学習モデルが、前記複数の不整脈タイプ分類の各々について、不整脈タイプ尤度値のそれぞれのセットを出力するように構成され、前記セットの前記不整脈タイプ尤度値の各々が、前記それぞれの不整脈タイプ分類が前記期間中のそれぞれの時間に発生した尤度を表し、
前記命令は、さらに前記コンピューティングシステムに、
1つ以上の脱分極検出機械学習モデルを前記エピソードデータに適用することであって、前記1つ以上の脱分極検出機械学習モデルが、脱分極尤度値のセットを出力するように構成され、前記セットの前記脱分極尤度値の各々が、脱分極が前記期間中のそれぞれの時間に発生した尤度を表す、適用することと、
前記不整脈タイプ尤度値および前記脱分極尤度値に基づいて、前記エピソード中に1つ以上の脱分極を識別することと、を行わせる、非一時的コンピュータ可読媒体。
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