JP2010535093A - 高速ドップラー光周波数領域撮像法のためのビーム走査パターンを放射するシステムおよび方法 - Google Patents
高速ドップラー光周波数領域撮像法のためのビーム走査パターンを放射するシステムおよび方法 Download PDFInfo
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Abstract
【選択図】図1A
Description
横軸FOVにわたるドップラー測定の並列化された獲得により、セグメント化された鋸歯状走査は、撮像フレームレートに影響を及ぼすことなく、幅広い範囲にわたってドップラー感度を調整することを可能にし得る。この走査パターンの代表的な詳細、および毎秒24フレーム(fps)という大きなFOVにわたる高感度ドップラー撮像を達成するその能力を、以下に記載する。例えば、ヒトの皮膚において獲得される三次元の脈管マップは、セグメント化された鋸歯状走査技術の機能を示し得るものであり、ヒトの皮膚における微小血管系を撮像するD―OCTの証明された有用性における著しい進歩に相当し得るものである。
第1セグメントおよび/または第2セグメントの第1の距離は、第1のポイントと第2のポイントとの間の第2の距離よりも小さくすることができる。
走査の時間は、略200ミリ秒未満および/または略50ミリ秒未満であり得る。
第1構成部は、電磁放射と、基準体(reference)から受ける少なくとも1つの更なる放射とに対応する、干渉信号を受け取るように用いることができる。
電磁放射の周波数は、時間の経過と共に変化し得る。第1の距離および/または第2の距離は、第1のポイントから第2のポイントへの第3距離の四分の一未満または八分の一未満であり得る。試料は、生物学的構造を含み得る。試料内の血流を測定すること、および/または処置に対する生物学的試料の反応を判定することができる。
以下、図面を参照して、例示的実施形態について本発明を詳細に説明する。
なお、本発明の真の範囲および趣旨から逸脱することなく、記載の実施形態の変更および改造が可能であることも意図している。
音響光学周波数シフタを用いた組合せにおける開始時間の変動は、スプリアスであって深さ依存でない位相シフトを引き起こし得る。単一の再較正ミラー信号を用いて、開始波長変動および開始時間変動の相対的な寄与を識別することは、困難であり得る。従って、適切な訂正信号を生成するために、測定された位相シフトと深さがどのように比例するかを判定することは、困難であり得る。このことに対処するために、変更した位相再較正方法を実行することができる。例えば、単相再較正信号の代わりに、略100ミクロンの間隔で離間した一対の位相再較正信号は、ガラススライド137の前面および裏面からの反射によって生成することができる。スプリアスのタイミングおよび開始波長が引き起こした位相シフトを除去するために、以下の代表的な手順を用いることができる。
開始波長の変動による位相シフトは、深さに比例するため、ゼロ微分遅延における位相シフトは、従って、周波数シフタに起因するそのような成分を提供し得る。更に、データ収集クロック(例えば略100MHzにおけるもの)および周波数シフタ駆動信号(例えば略25MHzにおけるもの)を位相ロックすることによって、この代表的な相変異の数値を、π/2(2π×25/100)の整数倍数に制限し得る。従って、挿入値は、最も近いD/2の整数倍に丸めることができる。この挿入された位相シフトは、次に、すべての深さにおいて、測定された位相差から減算でき、場合によっては、周波数シフタに起因する誤差を除去するものである。図2Cは、ゼロ微分遅延における、測定された位相シフトの代表的な分布を示す。
結果として、極めて高いドップラー感度を有する高フレームレートのシステムを達成することができる。
セグメント番号(N)の変化は、ドップラー積分窓(T)の変化をもたらし得るものであり、それによって走査パターンごとにドップラー感度を設定することができる。
それに加えて、従来技術の知識は引用によって本明細書に明示的に援用されてはいないという程度において、その全体が本明細書に明示的に援用されるものとする。本明細書において引用される上記のすべての文献は、その全体が引用によって本明細書に援用されるものとする。
Claims (22)
- 試料の特定の部分から提供される少なくとも一つの電磁放射の振幅又は位相を測定するように構成された、少なくとも一つの第1構成部と、
試料の第1のポイントから試料の第2のポイントまでの経路に沿って、特定の部分の位置を走査するように構成された、少なくとも一つの第2構成部と、を備え、
前記少なくとも一つの第2構成部は、正の速度を有する少なくとも一つの第1セグメントと、負の速度を有する少なくとも一つのセグメントが走査に含まれるように、走査を制御し、
前記少なくとも一つの第1セグメント、又は、前記少なくとも一つの第2セグメントの少なくとも一つの第1の距離は、前記第1のポイントと前記第2のポイントとの間の第2の距離よりも小さいことを特徴とする、装置。 - 前記少なくとも一つの第2構成部は、検流反射構成部又は音響光学偏向構成部の少なくとも一つを含むことを特徴とする、請求項1記載の装置。
- 走査時間は、略200ミリ秒未満であることを特徴とする、請求項1記載の装置。
- 走査時間は、略50ミリ秒未満であることを特徴とする、請求項1記載の装置。
- 前記少なくとも一つの第1構成部は、少なくとも一つの電磁放射と、基準体から受ける少なくとも一つのさらなる放射とに対応する、干渉信号を受けるように構成されていることを特徴とする、請求項1記載の装置。
- 前記少なくとも一つの電磁放射の周波数は時間とともに変化することを特徴とする、請求項1記載の装置。
- 前記第1の距離又は前記第2の距離の少なくとも一つは、前記第1のポイントから前記第2のポイントへの第3の距離の四分の一未満であることを特徴とする、請求項1記載の装置。
- 前記第1の距離又は前記第2の距離の少なくとも一つは、前記第1のポイントから前記第2のポイントへの第3の距離の八分の一未満であることを特徴とする、請求項1記載の装置。
- 前記試料が生物学的構造体を含む、請求項1記載の装置。
- 前記少なくとも一つの第1構成部は、試料の中の血流を測定するように構成されている、請求項9記載の装置。
- 前記少なくとも一つの第1構成部は、処置に対する生物学的試料による反応を判定するように構成されている、請求項9記載の装置。
- 試料の特定の部分から提供される少なくとも一つの電磁放射の振幅又は位相を測定するステップと、
試料の第1のポイントから試料の第2のポイントまでの経路に沿って、特定の部分の位置を走査するステップと、
正の速度を有する少なくとも一つの第1セグメントと、負の速度を有する少なくとも一つのセグメントが走査に含まれるように、走査を制御するステップと、を含み、
前記少なくとも一つの第1セグメント、又は、前記少なくとも一つの第2セグメントの少なくとも一つの第1の距離は、前記第1のポイントと前記第2のポイントとの間の第2の距離よりも小さいことを特徴とする、方法。 - 前記走査するステップは、検流反射構成部又は音響光学偏向構成部を含む、少なくとも一つの構成部によって実行されることを特徴とする、請求項12記載の方法。
- 走査時間は、略200ミリ秒未満であることを特徴とする、請求項12記載の方法。
- 走査時間は、略50ミリ秒未満であることを特徴とする、請求項12記載の方法。
- 更に、少なくとも一つの電磁放射と、基準体から受ける少なくとも一つのさらなる放射とに対応する、干渉信号を受けるステップを含む、請求項12記載の方法。
- 前記少なくとも一つの電磁放射の周波数は時間とともに変化する、請求項12記載の方法。
- 前記第1の距離又は前記第2の距離の少なくとも一つは、前記第1のポイントから前記第2のポイントへの第3の距離の四分の一未満であることを特徴とする、請求項12記載の方法。
- 前記第1の距離又は前記第2の距離の少なくとも一つは、前記第1のポイントから前記第2のポイントへの第3の距離の八分の一未満であることを特徴とする、請求項12記載の方法。
- 前記試料が生物学的構造体を含む、請求項12記載の方法。
- 前記少なくとも一つの第1構成部は、試料の中の血流を測定するように構成されている、請求項20記載の方法。
- 更に、処置に対する生物学的試料による反応を判定するステップを含む、請求項20記載の方法。
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EP2173254A2 (en) | 2010-04-14 |
US9375158B2 (en) | 2016-06-28 |
WO2009018456A2 (en) | 2009-02-05 |
US20090036782A1 (en) | 2009-02-05 |
WO2009018456A3 (en) | 2009-03-19 |
JP5917803B2 (ja) | 2016-05-18 |
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