JP2015527100A - 血管造影及びかん流の定量化並びに解析手法 - Google Patents
血管造影及びかん流の定量化並びに解析手法 Download PDFInfo
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Abstract
Description
B1+(P−B1)×k1・・・数式1
で定義され、動脈相の終了時刻は平均強度が最初に増加する、
B1+(P−B2)×k2・・・数式2
で定義される。ここで、k1は動脈相の開始を定義する割合(例えば、5%)を示し、k2は動脈相の終了を定義する割合(例えば、95%)を示す。
B2+(P−B2)×k3・・・数式3
で定義され、静脈相の終了時刻は平均強度が最初に低下する、
B2+(P−B2)×k4・・・数式4
で定義される。ここで、k3は静脈相の開始を定義する割合(例えば、95%)を示し、k4は静脈相の終了を定義する割合(例えば、5%)を示す。
B1+(P−B1)×k2・・・数式5と、
B2+(P−B2)×k3・・・数式6と
の間の平均強度の範囲で定義される。
BD(x,y,t)=C(x,y)×√(AICpost(0))/√(AICpost(t))・・・数7
ここで、BDは画素座標x,yで時間t前後のIDS間の基準差異であり、C(x,y)はIDSの最初の数秒で推定された前後画像の定数背景差分であり、AICpost(t)は後の画像取得の平均強度曲線であり、√(AICpost(0))/√(AICpost(t))は時間に沿って基準差異を調整するために使用される。図16から、後の画像取得シーケンスから使用可能な信号の損失を引き起こす”過剰な減算”に定数が導く場合には、基準ラインの差異を扱うことが教示される。
k=mean(Imax)+m×std(Imax)・・・数式8
ここで、Imaxは、1つのIDSの中で最大平均強度を有する静止画であり、meanは平均関数であり、stdは標準偏差関数、mは当該数式8を調整する0から1の範囲の定数である。閾値kは当該適用に依存して1つ以上のIDSに使用され、当該値を超える強度でのピクセルのみがかん流計算に使用される。
AIt)=Num(I(x,y,z)>k)×mean(I(x,y,z)>k)・・・数式9
ここで、AIは時間tでのかん流の強さと領域の組み合わせを示す数値である。I(x,y,z)はIDSのある時間位置の静止画像であり、Numは画素数を計算する関数であり、meanは平均関数である。
AI=(AI(T)post)/(AI(T)pre)・・・数式11
これまでに特定された他のCAAにおいて、かん流変化を推定するために、以下の数式12によって、
AI=(AI(T)CAWT−current)/(AI(T)CAWT−ref)・・・数式12
参照CAWTによる現在CAWTを正規化する。
a.ベースラインが十分に滑らかであるかのチェック
b.心臓適用の場合、グラフト後画像のベースラインがグラフト前画像の1つよりも大きいべきである。
c.画像取得の開始が遅れすぎた場合には、動脈相が途切れる
d.画像取得の終了が早すぎた場合には、静脈相が途切れる。
e.画像が暗すぎるかをチェック
f.画像が飽和しているかどうかをチェック。
g.時間曲線上の平均強度の形状及び平滑度をチェック。曲線の品質は、lungからの蛍光又はヘッドライトからの写り込みなどの外部要因によって低下する可能性がある。
Claims (20)
- 血管の血管造影を可視化する方法であって、
前記血管を通過する血流の動脈相、微小血管相、及び静脈相の全相の少なくとも1つのサイクルの全期間を網羅する前記血管の近赤外蛍光画像のシーケンスを取得する工程と、
画像の前記シーケンスに表れる近赤外蛍光の強度を算出する工程と、
前記近赤外蛍光の強度に対応する前記血管の相対的な血流を評価する工程と
を含むことを特徴とする方法。 - 前記近赤外蛍光の強度を算出する前記工程と、前記相対的な血流を評価する前記工程とは、コンピュータアルゴリズムに基づいて実行されることを特徴とする請求項1に記載の方法。
- 血流の視覚表示をユーザに提示する工程をさらに含むことを特徴とする請求項1に記載の方法。
- リアルタイムでの手術中の意思決定が、血流の前記視覚表示に基づいて行われることを特徴とする請求項3に記載の方法。
- 前記血管は、冠動脈バイパスグラフトであることを特徴とする請求項1に記載の方法。
- 血行再生の前後の血管で血管造影を可視化する方法であって、
前記血管を通過する血流の動脈相、微小血管相、及び静脈相の全相の少なくとも1つのサイクルの全期間を網羅する血行再生前の前記血管の近赤外蛍光画像のシーケンスを取得する工程と、
血行再生前に取得した画像の前記シーケンスに表れる近赤外蛍光の強度を算出する工程と、
血行再生前に取得した画像の前記シーケンスに表れる前記近赤外蛍光の強度に対応する前記血管の相対的な血流を評価する工程と、
前記血管を通過する血流の動脈相、微小血管相、及び静脈相の全相の少なくとも1つのサイクルの全期間を網羅する血行再生後の前記血管の近赤外蛍光画像のシーケンスを取得する工程と、
血行再生後に取得した画像の前記シーケンスに表れる近赤外蛍光の強度を算出する工程と、
血行再生後に取得した画像の前記シーケンスに表れる前記近赤外蛍光の強度に対応する前記血管の相対的な血流を評価する工程と、
血行再生前後に取得した画像のシーケンスに表れる前記近赤外蛍光の強度に対応する前記血管の相対的な血流を比較する工程と
を含むことを特徴とする方法。 - 前記近赤外蛍光の強度を算出する前記工程と、前記相対的な血流を評価する前記工程とは、コンピュータアルゴリズムに基づいて実行されることを特徴とする請求項6に記載の方法。
- 血流の視覚表示をユーザに提示する工程をさらに含むことを特徴とする請求項6に記載の方法。
- リアルタイムでの手術中の意思決定が、血流の前記視覚表示に基づいて行われることを特徴とする請求項8に記載の方法。
- 前記血管は、冠動脈バイパスグラフトであることを特徴とする請求項6に記載の方法。
- 組織のかん流を可視化及び定量化する方法であって、
前記組織のかん流の動脈相、微小血管相、及び静脈相の全相のうち少なくとも2つの相の少なくとも1つのサイクルの全期間を網羅する前記組織の近赤外蛍光画像のシーケンスを取得する工程と、
画像の前記シーケンスに表れる近赤外蛍光の強度を算出する工程と、
前記近赤外蛍光の強度に対応する前記組織の相対的なかん流を評価する工程と
を含むことを特徴とする方法。 - 前記近赤外蛍光の強度を算出する前記工程と、前記相対的なかん流を評価する前記工程とは、コンピュータアルゴリズムに基づいて実行されることを特徴とする請求項11に記載の方法。
- かん流の視覚表示をユーザに提示する工程をさらに含むことを特徴とする請求項11に記載の方法。
- リアルタイムでの手術中の意思決定が、かん流の前記視覚表示に基づいて行われることを特徴とする請求項13に記載の方法。
- 前記組織は、血行再生中の心筋、再生中の乳房組織、及び吻合中の腸組織を含むグループから選択されることを特徴とする請求項11に記載の方法。
- 外科手術前後の組織のかん流を可視化及び定量化する方法であって、
前記組織のかん流の動脈相、微小血管相、及び静脈相の全相うちの少なくとも2つの相の少なくとも1つのサイクルの全期間を網羅する外科手術前の前記組織の近赤外蛍光画像のシーケンスを取得する工程と、
外科手術前に取得した画像の前記シーケンスに表れる近赤外蛍光の強度を算出する工程と、
外科手術前に取得した画像の前記シーケンスに表れる前記近赤外蛍光の強度に対応する前記組織の相対的なかん流を評価する工程と、
前記組織のかん流の動脈相、微小血管相、及び静脈相の全相のうち少なくとも2つの相の少なくとも1つのサイクルの全期間を網羅する外科手術後の前記組織の近赤外蛍光画像のシーケンスを取得する工程と、
外科手術後に取得した画像の前記シーケンスに表れる近赤外蛍光の強度を算出する工程と、
外科手術後に取得した画像の前記シーケンスに表れる前記近赤外蛍光の強度に対応する前記組織の相対的なかん流を評価する工程と、
外科手術前後に取得した画像のシーケンスに表れる前記近赤外蛍光の強度に対応する前記組織の相対的なかん流を比較する工程と
を含むことを特徴とする方法。 - 前記近赤外蛍光の強度を算出する前記工程と、前記相対的なかん流を評価する前記工程とは、コンピュータアルゴリズムに基づいて実行されることを特徴とする請求項16に記載の方法。
- かん流の視覚表示をユーザに提示する工程をさらに含むことを特徴とする請求項16に記載の方法。
- リアルタイムでの手術中の意思決定が、かん流の前記視覚表示に基づいて行われることを特徴とする請求項18に記載の方法。
- 前記組織は、血行再生中の心筋、再生中の乳房組織、及び吻合中の腸組織を含むグループから選択されることを特徴とする請求項16に記載の方法。
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EP2863801B8 (en) | 2024-06-12 |
US11284801B2 (en) | 2022-03-29 |
US20230052746A1 (en) | 2023-02-16 |
JP6561180B2 (ja) | 2019-08-14 |
EP2863801A4 (en) | 2015-11-11 |
JP6368755B2 (ja) | 2018-08-01 |
EP2863801B1 (en) | 2024-04-24 |
WO2013190391A3 (en) | 2014-03-13 |
US10278585B2 (en) | 2019-05-07 |
HK1209995A1 (en) | 2016-04-15 |
JP2018183619A (ja) | 2018-11-22 |
US20130345560A1 (en) | 2013-12-26 |
WO2013190391A2 (en) | 2013-12-27 |
JP6028096B2 (ja) | 2016-11-16 |
EP2863801A2 (en) | 2015-04-29 |
US20190374106A1 (en) | 2019-12-12 |
JP2019213873A (ja) | 2019-12-19 |
CA2914778A1 (en) | 2013-12-27 |
JP2017051623A (ja) | 2017-03-16 |
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