JP7111871B2 - 磁気共鳴画像を用いた微小脳出血検出装置及び方法{Device and Methodfor Detecting Cerebral Microbleeds Using Magnetic Resonance Images} - Google Patents
磁気共鳴画像を用いた微小脳出血検出装置及び方法{Device and Methodfor Detecting Cerebral Microbleeds Using Magnetic Resonance Images} Download PDFInfo
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Description
図1は、本発明の一実施形態による磁気共鳴画像を用いた微小脳出血検出装置の全体的な構造を示す図である。
Claims (12)
- 磁気共鳴画像のSWI画像及び位相画像それぞれを正規化し、前記正規化された位相画像の符号を反転させる位相画像変換を行う前処理部と、
前記前処理されたSWI画像及び位相画像が結合された2チャンネル画像が入力され、微小脳出血に対する多数の候補領域を検出するYOLOニューラルネットワークモジュールと、
前記多数の候補領域に基づいて前記SWI画像及び位相画像の候補領域のパッチ画像が入力され、各候補領域のパッチ画像が微小脳出血症状がある画像であるか否かをニューラルネットワーク演算により判断する微小脳出血判断ニューラルネットワークモジュールと、を含むことを特徴とする磁気共鳴画像を用いた微小脳出血検出装置。 - 前記前処理部は、前記正規化されたSWI画像及び前記変換された位相画像と隣接したスライス画像との平均値を演算し、前記演算された平均値を反映する前処理をさらに行うことを特徴とする請求項1に記載の磁気共鳴画像を用いた微小脳出血検出装置。
- 前記YOLOニューラルネットワークモジュールは、多数のバウンディングボックス及び各バウンディングボックスの確率情報を出力するようにGT(GroundTruth)画像との損失を逆伝播して学習されることを特徴とし、前記GT画像との損失は、前記YOLOニューラルネットワークモジュールの出力と前記GT画像との差である請求項1に記載の磁気共鳴画像を用いた微小脳出血検出装置。
- 前記微小脳出血判断ニューラルネットワークモジュールは、CNN(ConvolutionalNeural Network)層及びFC(FullyConnected)層を含み、GT(Ground Truth)との損失を逆伝播して学習されることを特徴とし、前記GTとの損失は、前記微小脳出血判断ニューラルネットワークモジュールの出力と予め設定されたクラス値との差である請求項1に記載の磁気共鳴画像を用いた微小脳出血検出装置。
- 前記多数の候補領域に対する前記候補領域のパッチ画像それぞれは、前記正規化及び隣接スライスの平均演算が行われたSWI画像の候補領域及び前記正規化及び隣接スライスの平均演算が反映され、前記符号反転が反映されていない位相画像の候補領域を用いて生成されたことを特徴とする請求項2に記載の磁気共鳴画像を用いた微小脳出血検出装置。
- 前記候補領域のパッチ画像は、前記正規化及び前記隣接スライス平均演算が行われた前記SWI画像の候補領域の部分と、前記正規化及び前記隣接スライスの平均演算が行われた前記位相画像の候補領域の部分を連続して結合した1チャンネル画像であることを特徴とする請求項5に記載の磁気共鳴画像を用いた微小脳出血検出装置。
- 前処理部が磁気共鳴画像のSWI画像及び位相画像のそれぞれを正規化し、前記正規化された位相画像の符号を反転させる位相画像変換を行う前処理段階(a)と、
YOLOニューラルネットワークモジュールが前記前処理されたSWI画像及び位相画像が結合された2チャンネル画像が入力され、微小脳出血に対する多数の候補領域を検出するYOLOニューラルネットワーク演算段階(b)と、
微小脳出血判断ニューラルネットワークモジュールが前記多数の候補領域に基づいて、前記SWI画像及び位相画像の候補領域パッチ画像が入力され、各候補領域のパッチ画像が微小脳出血症状がある画像であるか否かをニューラルネットワーク演算により判断する微小脳出血判断ニューラルネットワーク演算段階(c)と、を含むことを特徴とする磁気共鳴画像を用いた微小脳出血検出方法。 - 前記前処理段階(a)は、
前記前処理部が、前記正規化されたSWI画像及び前記変換された位相画像と隣接するスライス画像との平均値を演算し、前記演算された平均値を反映する前処理をさらに行うことを特徴とする請求項7に記載の磁気共鳴画像を用いた微小脳血検出方法。 - YOLOニューラルネットワーク演算段階(b)は、
前記YOLOニューラルネットワークモジュールが、多数のバウンディングボックス及び各バウンディングボックスの確率情報を出力するようにGT(GroundTruth)画像との損失を逆伝播して学習されることを特徴とし、前記GT画像との損失は、前記YOLOニューラルネットワークモジュールの出力と前記GT画像との差である請求項7に記載の磁気共鳴画像を用いた微小脳出血検出方法。 - 前記微小脳出血判断ニューラルネットワーク演算段階(c)は、
前記微小脳出血判断ニューラルネットワークは、CNN(ConvolutionalNeural Network)層及びFC(FullyConnected)層を含み、GT(Ground Truth)との損失を逆伝播して学習されることを特徴とし、前記GTとの損失は、前記微小脳出血判断ニューラルネットワークモジュールの出力と予め設定されたクラス値との差である請求項7に記載の磁気共鳴画像を用いた微小脳出血検出方法。 - 前記多数の候補領域に対する前記候補領域のパッチ画像それぞれは、前記正規化及び隣接スライスの平均演算が行われたSWI画像の候補領域及び前記正規化及び隣接スライス平均演算が反映され、前記符号反転が反映されていない位相画像の候補領域を用いて生成されることを特徴とする請求項8に記載の磁気共鳴画像を用いた微小脳出血検出方法。
- 前記候補領域のパッチ画像は、前記正規化及び前記隣接スライス平均演算が行われた前記SWI画像の候補領域の部分と、前記正規化及び前記隣接スライス平均演算が行われた前記位相画像の候補領域部分を連続して結合した1チャンネル画像であることを特徴とする請求項11に記載の磁気共鳴画像を用いた微小脳出血検出方法。
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