JP2023501624A - 血管映像に基づいた主要血管領域抽出方法及び装置 - Google Patents
血管映像に基づいた主要血管領域抽出方法及び装置 Download PDFInfo
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Abstract
Description
「薬物療法が必要」
「血管拡張術が必要」
以上、本発明によれば、プロセッサは、造影術検査を介して得られた主要血管映像610,630から微細血管の映像を除去し、関心対象となる主要血管のみを分離して映像として表示することで、施術者は、より正確に主要血管の詰まった部位又は狭くなった部位を把握することができ、より正確な診断を行うことができる。
Claims (21)
- プロセッサによって行われる血管映像から主要血管領域を抽出する方法であって、
前記血管映像から全体血管領域(entire vessel region)を抽出するステップと、
主要血管領域を抽出する機械学習モデルに基づいて前記血管映像から主要血管領域を抽出するステップと、
前記全体血管領域に基づいて血管が分離された部分を連結することによって前記主要血管領域を補正するステップと、
を含む主要血管領域抽出方法。 - 前記機械学習モデルは、主要血管の予め決定された形態に対してトレーニングされた機械学習モデルである、請求項1に記載の主要血管領域抽出方法。
- 前記機械学習モデルは、右冠状動脈(right coronary artery、RCA)、左前下行動脈(left anterior descending artery、LAD)、及び左回旋動脈(left circumflex artery、LCX)のうち少なくとも1つの血管状態に対してトレーニングされた機械学習モデルである、請求項2に記載の主要血管領域抽出方法。
- 前記主要血管領域のうち前記血管が分離された部分を探知するステップをさらに含む、請求項1に記載の主要血管領域抽出方法。
- 前記血管が分離された部分を探知するステップは、前記主要血管領域に対応するビーロブ間の最短距離が、閾値距離未満であるビーロブ間の領域を前記血管が分離された部分として決定するステップを含む、請求項4に記載の主要血管領域抽出方法。
- 前記主要血管領域を補正するステップは、
前記主要血管領域に対応するビーロブ間の最短距離が、閾値距離未満であるビーロブ間の領域を連結する連結線を生成するステップと、
前記全体血管領域のうち前記連結線に対応する領域に基づいて、前記主要血管領域のうち前記血管が分離された部分を連結することによって前記主要血管領域を補正するステップと、
を含む、請求項4に記載の主要血管領域抽出方法。 - 前記主要血管領域を補正するステップは、前記全体血管領域のうち前記連結線に対応して前記血管が分離された部分を連結できる領域が複数である場合、複数の領域のうち前記血管が分離された部分を連結できる最短距離の領域に基づいて前記主要血管領域を補正するステップを含む、請求項6に記載の主要血管領域抽出方法。
- 前記血管映像のRGB値をグレースケールレベル(grayscale level)に変換するステップと、
前記グレースケールレベルに変換された血管映像に対して正規化するステップと、
をさらに含む、請求項1に記載の主要血管領域抽出方法。 - 前記全体血管領域を抽出するステップは、前記全体血管映像から生成された部分血管映像に基づいて前記全体血管領域を抽出するステップを含み、
前記主要血管領域を抽出するステップは、前記全体血管映像から生成された部分血管映像に基づいて前記主要血管領域を抽出するステップを含む、請求項1に記載の主要血管領域抽出方法。 - 前記主要血管領域を補正するステップは、
前記主要血管領域に対するユーザの位置指定入力に応答して前記血管が分離された部分を決定するステップと、
前記血管が分離された部分と隣接する周辺の主要血管領域に基づいて対象位置の主要血管領域を補正するステップと、
を含む、請求項1に記載の主要血管領域抽出方法。 - 請求項1~請求項10のいずれか一項に記載の方法を行うための命令語を含む1つ以上のコンピュータプログラムを格納したコンピュータで読み出し可能な記録媒体。
- 血管映像から全体血管領域を抽出し、主要血管領域を抽出する機械学習モデルに基づいて前記血管映像から主要血管領域を抽出し、前記全体血管領域に基づいて血管が分離された部分を連結することによって前記主要血管領域を補正するプロセッサと、
前記血管映像、前記全体血管領域、前記主要血管領域、前記機械学習モデルのうち少なくとも1つを格納するメモリと、
を含む、主要血管領域抽出装置。 - 前記機械学習モデルは、主要血管の予め決定された形態に対してトレーニングされた機械学習モデルである、請求項12に記載の主要血管領域抽出装置。
- 前記機械学習モデルは、右冠状動脈(right coronary artery、RCA)、左前下行動脈(left anterior descending artery、LAD)、及び左回旋動脈(left circumflex artery、LCX)のうち少なくとも1つの血管状態に対してトレーニングされた機械学習モデルである、請求項13に記載の主要血管領域抽出装置。
- 前記プロセッサは、前記主要血管領域のうち前記血管が分離された部分を探知する、請求項12に記載の主要血管領域抽出装置。
- 前記プロセッサは、前記主要血管領域に対応するビーロブ間の最短距離が、閾値距離未満であるビーロブ間の領域を前記血管が分離された部分として決定する、請求項15に記載の主要血管領域抽出装置。
- 前記プロセッサは、前記主要血管領域に対応するビーロブ間の最短距離が、閾値距離未満であるビーロブ間の領域を連結する連結線を生成し、前記全体血管領域のうち前記連結線に対応する領域に基づいて前記主要血管領域のうち前記血管が分離された部分を連結することによって前記主要血管領域を補正する、請求項15に記載の主要血管領域抽出装置。
- 前記プロセッサは、前記全体血管領域のうち前記連結線に対応して前記血管が分離された部分を連結できる領域が複数である場合、複数の領域のうち前記血管が分離された部分を連結できる最短距離の領域に基づいて前記主要血管領域を補正する、請求項17に記載の主要血管領域抽出装置。
- 前記プロセッサは、前記血管映像のRGB値をグレースケールレベルに変換し、前記グレースケールレベルに変換された血管映像に対して正規化する、請求項12に記載の主要血管領域抽出装置。
- 前記プロセッサは、全体血管映像から生成された部分血管映像に基づいて前記全体血管領域及び前記主要血管領域を抽出する、請求項12に記載の主要血管領域抽出装置。
- 前記プロセッサは、前記主要血管領域に対するユーザの位置指定入力に応答して前記血管が分離された部分を決定し、前記血管が分離された部分と隣接する周辺の主要血管領域に基づいて対象位置の主要血管領域を補正する、請求項12に記載の主要血管領域抽出装置。
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