JP6475496B2 - 自動較正システム - Google Patents
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- JP6475496B2 JP6475496B2 JP2014558794A JP2014558794A JP6475496B2 JP 6475496 B2 JP6475496 B2 JP 6475496B2 JP 2014558794 A JP2014558794 A JP 2014558794A JP 2014558794 A JP2014558794 A JP 2014558794A JP 6475496 B2 JP6475496 B2 JP 6475496B2
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Description
本願は、米国特許出願第13/402,798号(2012年2月22日出願)の利益およびそれを基礎とする優先権を主張する。該出願の全体は、参照により本明細書に引用される。
本発明は、概して、較正システムおよび使用方法に関し、より具体的には、光学撮像システムのための較正システムに関する。
円形および円筒形OCT走査デバイス、すなわち、回転カテーテル走査デバイスが、本質的極座標系(例えば、長さおよび幅ではなく、半径および角度)で物理的空間をサンプリングする。円形および円筒形OCT走査デバイスは、円筒形状断面、例えば、気道および血管管腔を伴う生理学的構造を撮像するために適用される。画像のデジタル表現(すなわち、数値を表す画素のアレイ)は、本質的に長方形である。意図的または人工的に生成されたOCT画像特徴を検出および使用するための方法は、自動的に、極座標(「レーダ状」)OCT画像内の深度範囲を調節することを含む。
本発明は一側面において以下の発明を包含する。
(発明1)
カテーテルを較正する方法であって、
カテーテル内の画像を撮影することと、
テンプレートを利用して、前記カテーテル反射線の位置を識別することと
を含む、方法。
(発明2)
前記テンプレートは、前記特定のカテーテルとともに記憶される、または動作可能にアクセス可能である、発明1に記載の方法。
(発明3)
前記テンプレートは、前記カテーテルの画像から直接導出される、発明1に記載の方法。
(発明4)
前記テンプレートを前記画像のあるバージョンと照合し、ピークを識別することをさらに含む、発明1に記載の方法。
(発明5)
前記画像のバージョンは、バイナリである、発明4に記載の方法。
(発明6)
最も強いテンプレート一致に対応する前記ピークを選択することをさらに含む、発明4に記載の方法。
(発明7)
前記ピークは、一定の値を上回る、発明6に記載の方法。
(発明8)
テンプレート一致が識別されない場合、前記Z−オフセット位置を調節し、前記テンプレート照合ステップを用いて評価されるべき新しい位置において、前記カテーテルの第2の画像を撮影することをさらに含む、発明1に記載の方法。
(発明9)
前記カテーテル反射線の位置を識別することと、テンプレート一致が識別された場合、前記Z−オフセットを調節することによって、前記カテーテル反射線をシフトさせることとをさらに含む、発明4に記載の方法。
(発明10)
前記Z−オフセットを調節することは、可変遅延線の機械的シフトを含む、発明6に記載の方法。
(発明11)
カテーテルを較正する方法であって、
カテーテル引き戻しを撮像することと、
画像取得中の反射位置に対するいかなるシフトも補正されることを確実にするために、画像データを整列させることと、
各画像フレームを通して、前記反射位置を追跡することと
を含む、方法。
(発明12)
前記反射位置を追跡するステップは、グラフ検索アルゴリズムを利用することを含む、発明11に記載の方法。
(発明13)
前記反射位置を追跡するステップは、テンプレート照合ステップを通して、前記反射の初期位置を識別する、発明11に記載の方法。
(発明14)
前記反射位置を追跡するステップは、初期ロックが取得されると、振幅および相対的位置に基づいて、前記画像を通して前記反射線を追跡することをさらに含む、発明13に記載の方法。
(発明15)
前記線は、一定距離を維持することによって、前記線の振幅および相対的位置に基づいて、前記画像を通して追跡される、発明14に記載の方法。
(発明16)
第1のA走査時、次のステップの方向を決定するために、近傍画素が続くA走査において検討され、各A走査に対して繰り返される、発明15に記載の方法。
(発明17)
前記ステップ方向を決定する前に、前記次のA走査を評価することと、次の「n」個のA走査を先読みすることとを含む先読みステップをさらに含む、発明16に記載の方法。
(発明18)
フレーム全体を通して前記反射線をトレースすることと、前記反射線をデジタル的に整列させることとをさらに含む、発明17に記載の方法。
(発明19)
カテーテルを較正する方法であって、
カテーテルの画像を撮影することと、
前記カテーテルの反射線を追跡することと、
画像において前記反射線を検出しないことと、
グラフ検索ステップまたはテンプレート照合ステップを用いて、喪失トラック画像を再取得することと
を含む、方法。
(発明20)
前記グラフ検索ステップは、許容可能な解の領域を拡大し、再現反射に対して、より多くの数のビンを検索する、発明19に記載の方法。
(発明21)
可能な検索領域を限定する保護帯域を識別し、脈管壁からの明るいはね返りへのロッオンを防止することをさらに含む、発明20に記載の方法。
(発明22)
前記テンプレート照合ステップは、前記喪失トラック画像を再取得し、前記カテーテル反射を追跡することを各後続フレームを通して継続するために移行して戻る、発明19に記載の方法。
(発明23)
深度較正および自動化された範囲調節の方法であって、
静止しているが、制御不能変位によるものではない画像特徴を検索することによって、非制御変位効果を認識することと、
極座標表現が正確な次元測定のために使用され得るように、連続した画像データを較正することと
を含む、方法。
(発明24)
表示に先立って、前記画像内の画像特徴を除去することをさらに含む、発明23に記載の方法。
(発明25)
初期較正モードのための方法であって、
内部カテーテル反射を利用して、較正位置に到達するために必要とされる可変遅延線シフトを識別することと、
前記カテーテル反射の初期テンプレートを決定することと、
各後続較正モードにおいて、前記初期テンプレートを利用し、前記反射のシフトを追跡することと、
前記適切なシフトを適用することと、
を含む、方法。
(発明26)
平均振幅または勾配を使用して、強い反射を検索することと、前記強い反射が検出されるまで、Z−オフセットを調節することとをさらに含む、発明26に記載の方法。
(発明27)
画像を横断して、前記強い反射を整列させることをさらに含む、発明27に記載の方法。
(発明28)
前記勾配および振幅の変化を使用して、前記カテーテル反射を識別することと、閾値勾配および振幅情報を識別し、前記テンプレート領域を決定することとをさらに含む、発明27に記載の方法。
(発明29)
反射のテンプレートを生成し、他の自動較正モードにおける後の使用のために記憶することをさらに含む、発明28に記載の方法。
(発明30)
全画像フレームに対して、初期ロック較正位置を維持することをさらに含む、発明29に記載の方法。
(発明31)
前記反射のテンプレートを使用して、前記カテーテル反射の位置を検出し、較正設定を更新し、適切な較正設定を維持することをさらに含む、発明30に記載の方法。
(発明32)
前記反射のテンプレートをシフトさせ、場所を検索し、ミラー信号を伴う完全テンプレートを作成することをさらに含む、発明31に記載の方法。
(発明33)
前記テンプレートおよび全A走査に対する相関係数を算出することをさらに含む、発明32に記載の方法。
(発明34)
各A走査に対する最大相関を見つけ、上位A走査の中央値を求めることをさらに含む、発明33に記載の方法。
(発明35)
デジタルシフトを画像および走査変換に適用することをさらに含む、発明34に記載の方法。
(発明36)
再生モード追跡較正のための方法であって、
第1のフレームに対するカテーテルの反射の初期位置を識別することと、
前記第1のフレームに対する全許容可能シフトおよび全A走査に対する相関を算出し、最大相関を識別することと、
後続のA走査に対して前記最大相関を後方および前方に利用して、各可能なシフトに対する相関を算出することと、
データセット内の全フレームを通して、前記A走査毎に追跡し、後の整列および表示のために、前記反射位置を記憶することと、
を含む、方法。
(発明37)
自動較正のための方法であって、
較正位置に対してカテーテルの初期較正を行なうことと、
前記較正位置を示す少なくとも1つのパラメータを監視することと、
前記較正位置が画像フレームでの更新を必要とするかどうか決定することと、
前記較正位置を更新することと
を含む、方法。
(発明38)
前記画像フレームは、A走査である、発明37に記載の方法。
(発明39)
前記画像フレームは、一式の画像フレームを含む、発明37に記載の方法。
Claims (8)
- 光学コヒーレントトモグラフィ(OCT)カテーテルを自動較正するためのシステムであって、
カテーテル内の画像を撮影するように構成される撮像部と、
前記カテーテルに特有の前記カテーテルの複数の構成要素からの複数の内部カテーテル反射線の位置を識別するように構成されるテンプレートと
を含み、
前記画像と前記テンプレートとを照合することにより、前記画像における前記内部カテーテル反射線の位置を識別し、前記画像と前記テンプレートとのテンプレート一致が識別される場合、Z−オフセットを調節することによって、前記内部カテーテル反射線をシフトさせ、
前記テンプレート一致が識別されない場合、前記Z−オフセットを調節し、前記テンプレートを用いて評価されるべき新しい位置において、前記カテーテルの第2の画像を撮影する、システム。 - 前記テンプレートは、特定の前記カテーテルとともに記憶される、または動作可能にアクセス可能である、請求項1に記載のシステム。
- 前記テンプレートは、前記カテーテルの前記画像から直接導出される、請求項1に記載のシステム。
- 前記テンプレートを前記画像のあるバージョンと照合し、ピークを識別するように前記システムが構成される、請求項1に記載のシステム。
- 前記画像のバージョンは、バイナリである、請求項4に記載のシステム。
- 最も強い前記テンプレート一致に対応する前記ピークを選択するように前記システムが構成される、請求項4に記載のシステム。
- 前記ピークは、一定の値を上回る、請求項6に記載のシステム。
- 前記Z−オフセットを調節することは、参照アーム経路長を調節するための可変遅延線の機械的シフトを含む、請求項6に記載のシステム。
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JP6396319B2 (ja) | 2012-12-21 | 2018-09-26 | ボルケーノ コーポレイション | 超音波トランスデューサ及び血管内超音波画像化システム |
EP2943127A4 (en) | 2013-01-08 | 2016-09-14 | Volcano Corp | PROCESS FOR FOCUSED ACOUSTIC COMPUTER TOMOGRAPHY (FACT) |
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2012
- 2012-02-22 US US13/402,798 patent/US9596993B2/en active Active
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- 2013-02-20 EP EP13751259.6A patent/EP2817585B1/en active Active
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- 2013-02-20 WO PCT/US2013/026834 patent/WO2013126390A1/en active Application Filing
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US20120224751A1 (en) | 2012-09-06 |
EP2817585A4 (en) | 2015-11-04 |
EP2817585A1 (en) | 2014-12-31 |
US20170156599A1 (en) | 2017-06-08 |
EP2817585B1 (en) | 2019-05-08 |
JP2015511162A (ja) | 2015-04-16 |
WO2013126390A1 (en) | 2013-08-29 |
US10206585B2 (en) | 2019-02-19 |
CA2865227A1 (en) | 2013-08-29 |
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