JP2005528600A - 眼の回し運動の向きと位置の追跡 - Google Patents
眼の回し運動の向きと位置の追跡 Download PDFInfo
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Abstract
Description
F1=TA1
F2=TA2+A1*sin(θ)+B1*cos(θ)
ここで、TAは、真の回し運動角度の推定値であり、θはマーカの角度座標である。回し運動角度データに関数を適用すると、その後、基準画像と第2画像との間の回し運動角度θ0についての推定値を提供することができる。
θtotal(t)=θ0+θ(t)
In(Ax+d)=I0(x)
Bin=Bi−X+Xn
Bi=Bi−X
B'i=Bi−Di
θn=meani(θ'i−θi)
患者の眼の基準画像と患者の眼の第2画像とを重ね合わせる位置合わせアルゴリズムについての実験結果が、Matlabソフトウェアを使用して得られた。フィッティングの確度は、いくつかの因子、すなわち、(1)フィッティングに使用された点の数(基準点のうち少なくとも半分(12個)を使用しなければならない)、(2)フィッティングのRMS誤差(許容される最高RMS誤差は1度)、(3)基準点のマッチングの視覚的検査によって決定され、分度器を用いて取得された測定値が推定値の確認に使用された。実験のオリジナル・セットは、倍率0.885のレーザ・カメラによって実施された。暗色の眼の画像すべてが、少なくとも1つの方法によって回し運動角度の正確な予測を与えた。しかし、明色の眼は、その倍率では、信頼性のある回し運動角度の推定値を得るのに十分なテクスチャをもたなかった。
回し運動追跡アルゴリズムを試験するために、当該アルゴリズムがいくつかの試験で実行された。本発明の方法とソフトウェアを使用して患者の眼の回し運動の動きを追跡した結果の第1のセットは、レーザ手術システムのカメラ20からのビデオ・フレームの画像を人為的に回転させるものであった。画像を、後続のフレームそれぞれについて反時計回りに1度ずつ回転させた。回転された合計15個のフレームが、回し運動追跡アルゴリズムによって解析された。オリジナル・フレームと最終フレームが、それぞれ図18Aと図18Bに示されている。回し運動追跡アルゴリズムの適用は、あらゆるフレームについてその実際の値から0.2度以内の精度で正確であった。
θtotal(t)=追跡[(基準画像、ビデオ)(t)+位置合わせ[波面基準画像]
Claims (50)
- 眼の第1画像と眼の第2画像とを重ね合わせる方法であって、前記第1画像と前記第2画像が瞳孔と虹彩の少なくとも一部分を含んでおり、
前記第1画像内の眼の虹彩上で少なくとも1つのマーカを選択するステップと、
前記第2画像内の虹彩上で、対応するマーカの場所を突き止めるステップと、
前記第1画像と前記第2画像内の共通の基準点をほぼマッチングさせ、前記第1の眼の画像の虹彩上のマーカと、前記第2の眼の画像の虹彩上のマーカとをマッチングさせることによって、前記眼の第1画像と前記眼の第2画像とを重ね合わせるステップと、
レーザ処置を、前記眼の第2画像と心合わせし、回し運動について位置合わせするステップとを含む方法。 - 前記共通の基準点が瞳孔中心である請求項1に記載の方法。
- 前記共通の基準点が瞳孔中心と虹彩中心に応じて画定される請求項1に記載の方法。
- 瞳孔中心、虹彩中心、と虹彩の境界の場所を突き止めるステップをさらに含んでおり、少なくとも1つのマーカを選択するステップが、前記虹彩中心と前記瞳孔中心の少なくとも1つに対する前記マーカの相対位置を見つけるステップを含む請求項1に記載の方法。
- 前記第1画像と前記第2画像の少なくとも1つを平滑化するステップを含む請求項1に記載の方法。
- 前記第1画像と前記第2画像内の虹彩をアンラップ処理するステップを含む請求項1に記載の方法。
- アンラップ処理するステップが、デカルト座標を極座標に変換するステップを含む請求項6に記載の方法。
- アンラップ処理された虹彩を複数のセクタに分割するステップを含む請求項6に記載の方法。
- 分割するステップが、24個のセクタを創り出すステップを含んでおり、各セクタが15度の範囲に及ぶ請求項8に記載の方法。
- 前記セクタが24個以上のセクタを含む請求項8に記載の方法。
- 前記セクタが24個以下のセクタを含む請求項8に記載の方法。
- 前記マーカがコントラストの高い虹彩斑であり、選択するステップが、各セクタ内で前記コントラストの高い虹彩斑の場所を突き止めるステップを含む請求項8に記載の方法。
- コントラストの高い虹彩斑それぞれからプロパティを抽出するステップを含む請求項12に記載の方法。
- 前記第2画像内で前記マーカの場所を突き止めるステップが、探索範囲を、前記眼の第1画像内の前記マーカの位置から15度以下の範囲内に制限するステップを含む請求項1に記載の方法。
- 選択するステップが、前記眼の第1画像上に人工のランドマークを描くステップを含む請求項1に記載の方法。
- 前記第1画像を第1カメラによって得るステップと、前記第2画像を第2カメラによって得るステップとを含む請求項1に記載の方法。
- 前記第2画像がビデオ・ストリームからのフレームである請求項1に記載の方法。
- 前記第1画像内のマーカと前記第2画像内のマーカとの間の、回し運動角度変位を推定するステップを含む請求項1に記載の方法。
- 回し運動角度変位を推定するステップが、楕円形の瞳孔を補正するステップを含む請求項18に記載の方法。
- 回し運動角度変位を推定するステップが、推定された回し運動回旋を反復重み付け関数でフィッティングして正弦歪みを補正するステップを含む請求項18に記載の方法。
- さらに、選択するステップが、虹彩上で複数のマーカの場所を突き止めるステップを含む請求項1に記載の方法。
- レーザ眼科手術の間に眼の回し運動の向きを追跡する方法であって、
眼の第1画像内で基準点の場所を突き止めるステップと、
前記眼の第1画像内で少なくとも1つのマーカを識別するステップと、
眼がレーザ・ビームと位置合わせされているときに得られる眼の第2画像内で、基準点の場所を突き止めるステップと、
前記眼の第2画像内で対応するマーカを識別するステップと、
前記第1画像と前記第2画像とで基準点に対する少なくとも1つのマーカの相対的な向きを比較することによって、前記第1画像と前記第2画像との間の眼の回し運動の眼球回旋を推定するステップと、
レーザ処置を前記眼の第2画像と位置合わせするステップとを含む方法。 - 眼のN番目の画像内で基準点の場所を突き止めるステップと、
前記眼のN番目の画像内で対応するマーカを識別するステップと、
前記N番目の画像とN−1番目の画像とで基準点に対するマーカの相対的な向きを比較することによって、前記N−1番目の画像と前記N番目の画像との間の眼の回し運動の眼球回旋を推定するステップとを含む請求項22に記載の方法。 - 前記N番目の画像と前記N−1番目の画像が、ビデオ・ストリームからの画像である請求項23に記載の方法。
- 前記第2画像内で少なくとも1つのマーカを識別する探索を、前記第1画像内のマーカの回し運動の向きから所定の範囲に制限するステップを含む請求項22に記載の方法。
- 前記所定の範囲が約15度である請求項25に記載の方法。
- 前記眼の第1画像内で少なくとも1つのマーカの場所を突き止めるステップが、虹彩内にコントラストの高い斑を見つけるステップを含む請求項22に記載の方法。
- 前記眼の第1画像内で少なくとも1つのマーカの場所を突き止めるステップが、眼の上に人工のマーカを設置するステップを含む請求項22に記載の方法。
- 少なくとも1つのマーカを識別するステップが、第1画像と第2画像内で複数のマーカの場所を突き止めるステップを含んでおり、回し運動の眼球回旋を推定するステップが、前記第1画像内の複数のマーカと前記第2画像内の対応するマーカとの角度オフセットを平均化するステップを含む請求項21に記載の方法。
- 眼の回し運動の眼球回旋を補償するようにレーザ処置の送りを調節するステップを含む請求項22に記載の方法。
- 前記共通の基準点が瞳孔中心と虹彩中心の少なくとも1つを含む請求項22に記載の方法。
- レーザ眼科手術を実施する方法であって、
眼の波面計測結果を計測するステップと、
前記波面計測結果を計測する間に眼の第1画像を得るステップと、
前記波面計測結果に基づいて眼のためのレーザ処置を始めるステップと、
レーザ・ビームの光軸の下にある眼の第2画像を前記第1画像と重ね合わせるステップと、
レーザ処置を、レーザ・ビームの光軸の下にある眼と心合わせするステップと、
レーザ処置の間、レーザ・ビームに対する眼の相対的な位置と回し運動の向きを監視するステップと、
眼の位置と回し運動の向きの変化を補償するようにレーザ処置の送りを調節するステップとを含む方法。 - 重ね合わせるステップが、前記第1画像内のマーカを前記第2画像内の対応するマーカとマッチングさせるステップを含んでおり、監視するステップが、共通の基準点に対するマーカの相対的な位置と向きを追跡するステップを含む請求項32に記載の方法。
- 前記基準点が瞳孔中心である請求項33に記載の方法。
- 前記基準点が瞳孔中心と虹彩中心に応じて決められる請求項33に記載の方法。
- 前記マーカの場所が眼の虹彩内で突き止められる請求項33に記載の方法。
- 重ね合わせるステップが、前記第1画像と前記第2画像内で虹彩中心と瞳孔中心の少なくとも1つの場所を突き止めるステップを含む請求項33に記載の方法。
- レーザ手術システムであって
眼の第1画像と、眼の波面計測結果と眼のための切除パターンのうちの少なくとも1つとを受け取るように構成されたコンピュータ・プロセッサと、
前記コンピュータ・プロセッサに結合された、レーザ・ビームの光軸の下にある眼の位置を追跡する眼球追跡装置と、
前記コンピュータ・プロセッサに結合された、眼の回し運動の向きを追跡する回し運動追跡装置とを含んでおり、
前記コンピュータ・プロセッサが、眼の位置および/または回し運動の向きの変化に基づいて切除パターンの送りを調節するように構成されるレーザ手術システム。 - 前記眼の第1画像が波面計測の間に取得され、前記コンピュータ・プロセッサが、前記第1画像をレーザ・ビームの光軸の下にある眼のリアルタイム画像と重ね合わせるように構成される請求項38に記載のシステム。
- 前記コンピュータ・プロセッサに結合され、眼に切除パターンを形成するように構成されたレーザを含む請求項38に記載のシステム。
- 前記波面計測結果を得る波面計測デバイスを含む請求項38に記載のシステム。
- 前記波面計測デバイスが、前記眼の第1画像を得る撮像アセンブリを含む請求項41に記載のシステム。
- 前記回し運動追跡装置に結合された、レーザ・ビームの光軸の下にある眼の画像を得る撮像デバイスをさらに含む請求項38に記載のシステム。
- 眼の第1画像と眼の第2画像とを重ね合わせるシステムであって、
眼の第1画像を受け取るように構成されたコンピュータ・プロセッサと、
前記コンピュータ・プロセッサに結合された、眼の第2画像を得ることのできる撮像デバイスとを含んでおり、
前記コンピュータ・プロセッサが、前記眼の第1画像と第2画像内で共通の基準点の場所を突き止め、前記第1画像内で少なくとも1つのマーカの場所を突き止め、前記第2画像内で対応するマーカを見つけるように構成されており、前記コンピュータ・プロセッサが、前記第1画像と前記第2画像の基準点とマーカをほぼマッチングさせることによって前記第1画像と前記第2画像とを重ね合わせるシステム。 - 前記基準点が瞳孔中心と虹彩中心の少なくとも1つを含む請求項44に記載の方法。
- 眼の波面計測結果を得る波面計測デバイスを含んでおり、前記波面計測デバイスが、波面計測結果を得る間に眼の第1画像を得る撮像アセンブリを含む請求項44に記載のシステム。
- 前記コンピュータ・プロセッサに結合された、眼にレーザ・ビーム処置を施すレーザ・アセンブリを含む請求項44に記載のシステム。
- 前記撮像デバイスが、眼がレーザ・ビームの光軸に沿って位置決めされているときに眼を撮像するように位置決めされる請求項44に記載のシステム。
- 前記コンピュータ・プロセッサが、前記第1画像と前記第2画像との間の眼の回し運動の眼球回旋を推定するように構成される請求項44に記載のシステム。
- 眼の第1画像と眼の第2画像とを重ね合わせるシステムであって、
前記第1画像を得る手段と、
前記眼の第2画像を得る手段とを含んでおり、前記第1画像と前記第2画像が瞳孔と虹彩の少なくとも一部分を含んでおり、前記システムがさらに、
前記第1画像内の眼の虹彩上で少なくとも1つのマーカを選択する手段と、
前記第2画像内の虹彩上で少なくとも1つのマーカの場所を突き止める手段と、
前記第1画像と前記第2画像の共通の基準点をほぼマッチングさせ、前記第1の眼の虹彩内のマーカと前記第2の眼の虹彩内のマーカとの間の回し運動回旋を推定する手段とを含むシステム。
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JP2021526894A (ja) * | 2018-06-08 | 2021-10-11 | アルコン インコーポレイティド | 診断用眼科測定における自動ねじれ補正のためのシステム及び方法 |
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US10251783B2 (en) | 2019-04-09 |
US7431457B2 (en) | 2008-10-07 |
US7044602B2 (en) | 2006-05-16 |
MXPA04011893A (es) | 2005-03-31 |
WO2003102498A1 (en) | 2003-12-11 |
US20090012505A1 (en) | 2009-01-08 |
CN1650148A (zh) | 2005-08-03 |
US20140316390A1 (en) | 2014-10-23 |
US20080009840A1 (en) | 2008-01-10 |
US20030223037A1 (en) | 2003-12-04 |
US7261415B2 (en) | 2007-08-28 |
CN100442006C (zh) | 2008-12-10 |
US20060161141A1 (en) | 2006-07-20 |
AU2002346438A1 (en) | 2003-12-19 |
US20170151089A1 (en) | 2017-06-01 |
US9596983B2 (en) | 2017-03-21 |
EP1516156A1 (en) | 2005-03-23 |
US8740385B2 (en) | 2014-06-03 |
CA2487411A1 (en) | 2003-12-11 |
CA2487411C (en) | 2011-06-14 |
EP1516156A4 (en) | 2008-09-10 |
JP4256342B2 (ja) | 2009-04-22 |
EP1516156B1 (en) | 2019-10-23 |
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