JP5749164B2 - 組織バイオマーカーの定量的多重スペクトル光音響トモグラフィ - Google Patents
組織バイオマーカーの定量的多重スペクトル光音響トモグラフィ Download PDFInfo
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/0059—Measuring for diagnostic purposes; Identification of persons using light, e.g. diagnosis by transillumination, diascopy, fluorescence
- A61B5/0073—Measuring for diagnostic purposes; Identification of persons using light, e.g. diagnosis by transillumination, diascopy, fluorescence by tomography, i.e. reconstruction of 3D images from 2D projections
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/0093—Detecting, measuring or recording by applying one single type of energy and measuring its conversion into another type of energy
- A61B5/0095—Detecting, measuring or recording by applying one single type of energy and measuring its conversion into another type of energy by applying light and detecting acoustic waves, i.e. photoacoustic measurements
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Description
1.好ましい実施形態の特長
2.理論的考察
光音響的反転
からバイオマーカーの、例えば3次元分布を再構成するために行われる。特定の反転スキームは、使用される検出要素に関して、特に幾何学的及び物理的特性並びに空間分布に依存する各場合毎に異なるものである。例えば、検出器のフェイズドアレーが用いられる場合は、超音波を形成する簡単なアルゴリズムを用いて画像をリアルタイムに形成できる。
すなわち吸収されたエネルギー濃度(単位:J/m3)
と局部的な温度上昇
との間の時空間的依存性は、数1
に置かれると、初めての近似において、この検出要素は数1の解、すなわち、
光子伝播のモデル化
は光源分布である。この微分方程式の解を求めるには、媒質μa及びμs’に関する空間的に変化する光学的特性と共に右辺の光源要素に関する空間分布及び強度を知る必要がある。複雑な幾何形態では、光の拡散は有限要素法の手法を使って数3で演算できる。
スペクトル処理
画像形成
3.他の用途
3.1生体撮像
3.2臨床撮像
1…ターゲット組織
2…バイオマーカー
3…組織バイオマーカーの画像
4…ヒトの発端者
5…器官
6…ターゲット組織の外側表面
7…血管
8…マウス
10…光照射部
11…光照射要素
12…光照射要素
13…光ファイバ
14…光ファイバ
15…光源
16…光ファイバ
17…対向する方向
18…対向する方向
20…検出器
21…センサ要素
22…センサ要素
23…電気ケーブル
24…電気ケーブル
25…センサ要素
26…音響検出要素の配列
30…再構成器
31…画像形成プロセッサ
32…生データ処理用のプロセッサ
33…出力器
34…筐体
40…測定ヘッド部
41…筐体本体
42…接触表面
50…容器
51…タンク
52…保持要素
53…マッチング流体
54…保持要素
Claims (11)
- 多重スペクトル光音響トモグラフィ(MSOT)用の撮像装置の作動方法であって、
複数の光出射波長において少なくとも一のパルス光出射パターンを発するための光出射部が、光を出射する工程と、
前記光出射に対してターゲット組織から発される圧力信号を検出器で検出する工程と、
再構成器が、ターゲット組織内におけるターゲット組織バイオマーカーの濃度の空間的な分布を表す定量的トモグラフィ画像を再構成する工程と
を含み、
前記撮像装置が、前記圧力信号を、
再構成された光音響イメージを取得する反転スキームと、
局所光吸収係数に基づくターゲット組織内の局所光フルーエンスの分離と、
少なくとも一のスペクトル処理のスキームと
を用いて解析し、
該光フルーエンスは、間接的な光子伝播モデルに代えて、ブラインド信号源分離を用いて、検出圧力信号及び/又は再構成光音響イメージから直接抽出されたものである撮像装置の作動方法。 - 請求項1に記載の撮像装置の作動方法であって、
光出射パターンは、時分割した態様で少なくとも2つのスペクトル的に別個の波長範囲を有する撮像装置の作動方法。 - 請求項1又は2に記載の撮像装置の作動方法であって、スペクトル処理のスキームが、
反転スキームに統合する工程、
収集されたデータを処理する工程、
再構成されたデータを処理する工程のうち、
少なくとも一を含んでなる撮像装置の作動方法。 - ターゲット組織バイオマーカーを含むターゲット組織を撮像する多重スペクトル光音響トモグラフィ(MSOT)用の撮像装置であって、
ターゲット組織バイオマーカーによって吸収される、複数の光照射波長において少なくとも一のパルス光照射パターンでターゲット組織に光照射するよう構成された光照射部と、
前記光照射に応答してターゲット組織内においてターゲット組織バイオマーカーから生成される圧力信号を検出するよう構成された検出器と、
ターゲット組織内におけるターゲット組織バイオマーカーの濃度の空間的な分布を表す定量的トモグラフィ画像を再構成するよう構成された再構成器と
を含み、
再構成器は、
再構成された光音響イメージを取得する反転スキームを実行するよう構成されたプロセッサと、
局所光吸収係数に基づきターゲット組織内の局所光フルーエンスを分離するよう構成されたプロセッサと、
スペクトル処理のスキームを実行するよう構成されたプロセッサと、
を備えており、
該光フルーエンスは、間接的な光子伝播モデルに代えて、ブラインド信号源分離を用いて、検出圧力信号及び/又は再構成光音響イメージから直接抽出されたものである撮像装置。 - 請求項4に記載の撮像装置であって、
光照射部及び検出器が共通の測定ヘッド部に統合されてなる撮像装置。 - 請求項5に記載の撮像装置であって、
測定ヘッド部が光照射要素及び検出要素の配列を備えてなる撮像装置。 - 請求項6に記載の撮像装置であって、前記配列が、
光照射要素及び検出要素の線状配置と、
光照射要素及びセンサ要素が交互に分布された格子状配置
のうち、少なくとも一を含んでなる撮像装置。 - 請求項4乃至7のいずれか一に記載の撮像装置であって、
光照射部が少なくとも2つの異なる拡散投影方向に沿ってターゲット組織に光照射するよう構成されてなる撮像装置。 - 請求項4乃至8のいずれか一に記載の撮像装置であって、光照射部及び検出器が、
血管内に配置され、光照射部が光ファイバ又は光波ガイドを備えている、又は
ターゲット組織の外側表面との接触を可能にしてなる、
の少なくとも一の構成としてなる撮像装置。 - 請求項4乃至9のいずれか一に記載の撮像装置であって、
光照射部及び検出器のうち少なくとも一が内視鏡装置、腹腔鏡装置又は挿入装置内に設けられてなる撮像装置。 - 請求項4乃至10のいずれか一に記載の撮像装置であって、
血管、特に冠動脈又は頸動脈の画像を構築するために、再構成器が反転法及びスペクトル処理を適用するよう構成されており、画像がターゲット組織内におけるバイオマーカーの空間分布を示してなる撮像装置。
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PCT/EP2008/006142 WO2010009747A1 (en) | 2008-07-25 | 2008-07-25 | Quantitative multi-spectral opto-acoustic tomography (msot) of tissue biomarkers |
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JP2011528923A JP2011528923A (ja) | 2011-12-01 |
JP2011528923A5 JP2011528923A5 (ja) | 2014-09-25 |
JP5749164B2 true JP5749164B2 (ja) | 2015-07-15 |
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US (1) | US9572497B2 (ja) |
EP (1) | EP2344019B1 (ja) |
JP (1) | JP5749164B2 (ja) |
CN (1) | CN102137618B (ja) |
CA (1) | CA2731409C (ja) |
WO (1) | WO2010009747A1 (ja) |
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