JP5718988B2 - 光コヒーレンストモグラフィにおいて偏光に基づく直交復調を実行する装置、方法及び記憶媒体 - Google Patents
光コヒーレンストモグラフィにおいて偏光に基づく直交復調を実行する装置、方法及び記憶媒体 Download PDFInfo
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Description
(関連出願の相互参照)
(連邦政府により支援された研究に関する声明)
はサンプルアーム反射率の位相である。
a(z´)=FT(S(k))
を
は、この複素信号のFTにより与えられる。
(代表的な実施の形態の光学的復調回路/装置)
較正
SQ (k)=AQ(k)+BQ(k)cos(φ)
SI(k)=AI(k)+BI(k)sin(φ+ζ(k))
ここで、φは、深さ情報を含む干渉位相差である。パラメータAQ,BQ,AI,BI及びζは、ソーススペクトル及び復調回路によって決定することができる。これらパラメータが既知である場合、正確な直交信号は、次のように構築できる。
S´Q=BQ cos(φ)=SQ−AQ
総和iは、所与の波数kにおけるサンプルについてのものである。パラメータζは、次のように計算することができる。
を計算することができる。所与の波数kにおける同相信号は、SI=Bsin(φ)として表してもよく、直交信号はSQ=αBcos(φ−ε)として得られる。ここでα及びεは、真の直交信号からのSQの偏差を表す(真の直交信号ではα=1及びε=0)。DC成分を減算したと仮定することができる。測定した同相信号SIに対する補正後の直交信号
は、
として表される。
を用いた、Aラインを示す。減光は、30dBから50dBを超えるまでに改善されている。図9C及び図9Dに、+0.4mm及び−1.3mmのミラーの深さで測定したAラインを示す。図9B及び図9Dの各々は、以前に導き出した同様の較正パラメータα及びεを用いており、減光は50dBを超えている。光学的復調回路の周囲を適切に囲シールディングすることにより、較正係数の有効性は、60分を超える期間にわたって保たれた。測定した当該システムの感度は、+0.2mmの深さ近傍で107dBから+2.0mmの深さで103dBまで変化した。
Claims (4)
- 少なくとも一つの第1の電磁放射をサンプルに供給するように、そして少なくとも一つの第2の電磁放射を基準体に供給するように構成され、時間にわたって変化するスペクトルを有するために、前記第1の電磁放射と前記第2の電磁放射の少なくとも一つを生ずるように構成された、少なくとも一つの第1の構成部と、
直交復調の実行のために、前記少なくとも一つの第1の電磁放射に関連づけられた少なくとも一つの第3の放射と、前記少なくとも一つの第2の電磁放射に関連づけられた少なくとも一つの第4の放射との間の干渉を検出することにより第1の信号を生成し、前記少なくとも一つの第3の放射と前記少なくとも第4の放射の間の干渉を検出することにより第2の信号を生成し、前記第1の信号と前記第2の信号の位相の差は略90度である、少なくとも一つの第2の構成部と、
自身と関連付けられた複屈折を有し、前記第1の信号と前記第2の信号の位相の差を、前記複屈折の関数として、略90度になるように制御するように構成された、少なくとも一つの第3の複屈折構成部と、を備えた装置。 - 前記少なくとも一つの第3の構成部は、ファイバ偏光コントローラ又はバルク光学系複屈折構成部の少なくとも一つを含む、請求項1記載の装置。
- 少なくとも一つの第1の電磁放射をサンプルに供給し、少なくとも一つの第2の電磁放射を基準体に供給し、前記第1の電磁放射と前記第2の電磁放射の少なくとも一つは、時間にわたって変化するスペクトルを有する、ステップと、
直交復調の実行のために、前記少なくとも一つの第1の電磁放射に関連づけられた少なくとも一つの第3の放射と、前記少なくとも一つの第2の電磁放射に関連づけられた少なくとも一つの第4の放射との間の干渉を検出することにより第1の信号を生成し、前記少なくとも一つの第3の放射と前記少なくとも第4の放射の間の干渉を検出することにより第2の信号を生成し、前記第1の信号と前記第2の信号の差は略90度である、ステップと、
自身と関連付けられた複屈折を有する構成部によって、前記第1の信号と前記第2の信号の位相の差を、前記複屈折の関数として、略90度になるように制御するステップと、を含む方法。 - プログラムを記録した記憶媒体であって、
サンプルに供給される少なくとも一つの第1の電磁放射と、基準体に供給される少なくとも一つの第2の電磁放射とを制御し、前記第1の電磁放射と前記第2の電磁放射の少なくとも一つは、時間にわたって変化するスペクトルを有する、手順と、
直交復調の実行のために、前記少なくとも一つの第1の電磁放射に関連づけられた少なくとも一つの第3の放射と、前記少なくとも一つの第2の電磁放射に関連づけられた少なくとも一つの第4の放射との間の干渉を検出することにより第1の信号を生成し、前記少なくとも一つの第3の放射と前記少なくとも第4の放射の間の干渉を検出することにより第2の信号を生成し、前記第1の信号と前記第2の信号の位相の差は略90度である、手順と、
自身と関連付けられた複屈折を有する構成部を用いて、前記第1の信号と前記第2の信号の位相の差を前記複屈折の関数として、略90度になるように制御する手順と、を処理部に実行させるためのプログラムを記録した記憶媒体。
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JP2013155580A Active JP5718988B2 (ja) | 2005-08-09 | 2013-07-26 | 光コヒーレンストモグラフィにおいて偏光に基づく直交復調を実行する装置、方法及び記憶媒体 |
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US (1) | US9441948B2 (ja) |
EP (3) | EP1913332B1 (ja) |
JP (2) | JP5547402B2 (ja) |
KR (1) | KR101387454B1 (ja) |
CN (1) | CN101238347B (ja) |
AT (1) | ATE484727T1 (ja) |
DE (1) | DE602006017558D1 (ja) |
ES (1) | ES2354287T3 (ja) |
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JP4241038B2 (ja) | 2000-10-30 | 2009-03-18 | ザ ジェネラル ホスピタル コーポレーション | 組織分析のための光学的な方法及びシステム |
JP4995720B2 (ja) | 2004-07-02 | 2012-08-08 | ザ ジェネラル ホスピタル コーポレイション | ダブルクラッドファイバを有する内視鏡撮像プローブ |
KR20070058523A (ko) | 2004-08-24 | 2007-06-08 | 더 제너럴 하스피탈 코포레이션 | 혈관절편 영상화 방법 및 장치 |
EP1816949A1 (en) * | 2004-11-29 | 2007-08-15 | The General Hospital Corporation | Arrangements, devices, endoscopes, catheters and methods for performing optical imaging by simultaneously illuminating and detecting multiple points on a sample |
US7336366B2 (en) * | 2005-01-20 | 2008-02-26 | Duke University | Methods and systems for reducing complex conjugate ambiguity in interferometric data |
JP2008538612A (ja) * | 2005-04-22 | 2008-10-30 | ザ ジェネラル ホスピタル コーポレイション | スペクトルドメイン偏光感受型光コヒーレンストモグラフィを提供することの可能な構成、システム、及び方法 |
KR101410867B1 (ko) | 2005-04-28 | 2014-06-23 | 더 제너럴 하스피탈 코포레이션 | 광간섭 정렬 기술로 해부학적 구조와 연계된 정보를평가하는 시스템, 공정 및 소프트웨어 배열 |
WO2006130802A2 (en) * | 2005-06-01 | 2006-12-07 | The General Hospital Corporation | Apparatus, method and system for performing phase-resolved optical frequency domain imaging |
WO2007019574A2 (en) | 2005-08-09 | 2007-02-15 | The General Hospital Corporation | Apparatus, methods and storage medium for performing polarization-based quadrature demodulation in optical coherence tomography |
WO2007022220A2 (en) * | 2005-08-16 | 2007-02-22 | The General Hospital Corporation | Arrangements and methods for imaging in vessels |
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US8145018B2 (en) | 2006-01-19 | 2012-03-27 | The General Hospital Corporation | Apparatus for obtaining information for a structure using spectrally-encoded endoscopy techniques and methods for producing one or more optical arrangements |
CN101370426A (zh) * | 2006-01-20 | 2009-02-18 | 通用医疗公司 | 利用对光学相干断层扫描的波阵面调制来提供散斑减少的系统、装置和过程 |
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EP2207008A1 (en) | 2010-07-14 |
US9441948B2 (en) | 2016-09-13 |
CN101238347B (zh) | 2011-05-25 |
JP2009505073A (ja) | 2009-02-05 |
JP2013253986A (ja) | 2013-12-19 |
KR101387454B1 (ko) | 2014-04-22 |
EP1913332A2 (en) | 2008-04-23 |
EP2267404B1 (en) | 2016-10-05 |
KR20080042883A (ko) | 2008-05-15 |
ES2354287T3 (es) | 2011-03-11 |
ATE484727T1 (de) | 2010-10-15 |
WO2007019574A3 (en) | 2007-05-10 |
EP2267404A1 (en) | 2010-12-29 |
DE602006017558D1 (de) | 2010-11-25 |
CN101238347A (zh) | 2008-08-06 |
WO2007019574A2 (en) | 2007-02-15 |
EP1913332B1 (en) | 2010-10-13 |
US20070035743A1 (en) | 2007-02-15 |
JP5547402B2 (ja) | 2014-07-16 |
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