JP6548639B2 - 光生理センサ及び組み立て方法 - Google Patents
光生理センサ及び組み立て方法 Download PDFInfo
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Description
(i)例えばスポーツパフォーマンスのためか、もしくは一般的な健康、フィットネスレベルを維持又は向上させる自己モニタリング;および
(ii)慢性疾患患者又は術後ケアを受けたものの重要なヘルスパラメータを捕捉する臨床医のモニタリング。
さらに、モニタリングは、基礎となる疾患を同定又は確認するために行ってもよく、又は、根底にある状態を追跡して悪化を防ぐために早期警告信号を提供するためにリスクの患者の重要なパラメータをモニタする。
モニタすべき少なくとも1つの生体組織タイプの光生理学的特性をモデル化することと、
モデルの適用により、操作可能な光生理(OP)センサのための最適な光学設計を決定することと、
少なくとも1つの生体組織タイプの光生理学的性質をモニタすることと、
決定された光学設計に対してOPセンサを作成することとを含み、
前記OPセンサのための最適な光学設計は、
各光源からモニタすべき生体組織タイプを介して光検出器へ伝送する光に対するモデル化された光路長に基づいて、光検出器からの複数の光源の最適な間隔を決定することと、
前記光検出器から異なる距離で異なる波長の光源を配置することとを含む。
複数の光源と、
上記光源からの光がモニタ対象の生体組織タイプを介して伝送した後に、1つ以上の光源から放射された放射線を捕捉するように構成された少なくとも1つの光検出器と、
上記複数の光源は、モニタ対象の生体組織タイプの光生理学的特性のモデルによって決定される位置において光検出器に対して相対的に配置され、
前記光検出器からの各光源の最適な間隔は、各光源からの光がモニタすべき生体組織タイプを介して光検出器に伝送するモデル化された光路長に基づいており、
前記異なる波長の光源は光検出器から異なる距離に配置される。
上記方法は、
少なくとも1つの光検出器からの出力に、各個々の光源の寄与から独立した信号を得ることと、
それぞれの独立した信号の信号品質の1つ以上の測定を実行することと、
各個々の光源の照射強度を変更し、信号品質の測定を繰り返すことと、
独立した信号の信号品質の上昇を受けている個々の光源の強度を変更して信号品質の測定を繰り返すことと、
独立した信号の信号品質の低下を受けている個々の光源の強度の変更を逆転して信号品質の測定を繰り返すことと、
信号に対応する信号品質がピークに達するときの個々の光源の強度を固定することと、
独立した信号がしきい値以下である複数の光源を選択的に不活性化することを含む。
本発明の第2又は第3の態様に係る光生理(OP)センサと、
光検出器によって測定された信号を分析して少なくとも1つの生理的パラメータを決定するように構成された分析器とを備える。
(i)本明細書で詳述した複数の式、それらの置換、又はそれらの個別の派生物(すなわち、数値的に解ける式)の1つ又はそれ以上の式;
(ii)それらの発光波長及び空間分布を含む1つ以上の光源の数値又は数学的記述。
(iii)組織の層の組の、厚さと静的及び動的な光学特性を含む生体組織部位の数値又は数学的記述(例えば、表皮、真皮表面、表面的な皮膚叢、深い真皮、深い真皮叢、皮下脂肪);
(iv)光源−検出器の間隔ls−d及び散乱係数μsの関数としての有効な光路長Lの数値又は数学的記述。これらは例えば、放射輸送方程式又はP1(拡散)近似式の有限要素解を使用して、関心対象の生体組織部位の3次元幾何学モデルに適用される。
(1)光検出器30から出力までの各光源28の寄与から独立した信号を得る。
(2)それぞれの独立した信号の信号品質の1つ以上の測定を実行する。
(3)各個々の光源28の照明強度を変更して信号品質の測定を繰り返す。
(4)さらに、個々の光源28の強度を変更する。
(5)その独立した信号の信号品質の上昇を受けて、信号品質の測定を繰り返す。
(6)個々の光源28の強度の変更を逆転させる。
(7)その独立した信号の信号品質の低下を受けていると信号品質の測定を繰り返す。
(8)信号に対応する信号品質がピークに達したときに個々の光源28の強度を修正する。
(9)独立した信号がしきい値以下であるときに選択的に光源28を無効化する。
従って、コントローラ48は、個々の光源28からの信号強度を最適化するように構成されてもよい。これは、図6に関連して以下に説明する信号品質の評価と同様に処理する別の処理の前に、各光源が定常状態で動作していることを確実にするために初期化ステップとして実行することができる。
Claims (7)
- 光生理(OP)センサ(12,40,42,44)を組み立てる方法であって、
前記方法は、
モニタすべき少なくとも1つの生体組織タイプに係る光生理学的特性をモデル化することと、
モデル(14)を用いて操作可能な光生理(OP)センサ(12,40,42,44)のための光学設計(16)を決定し、少なくとも1つの生体組織タイプに係る光生理学的性質をモニタすることと、
決定された光学設計に対してOPセンサ(12,40,42,44)を作成することとを含み、
前記OPセンサ(12,40,42,44)のための光学設計(16)は、
複数の光源(28)のうちの各光源(28)からモニタすべき生体組織を介して光検出器(30)へそれぞれ伝送する光のモデル化された光路長(24)に基づいて、前記光検出器(30)からの前記複数の光源(28)のうちの各光源の間隔(26)を決定することを含み、
前記光学設計(16)は、
第1の円の周上のアレイ内の第1の波長の複数の第1の光源(28)を配置するステップと、
第2の円の周上のアレイ内に第2の波長の複数の第2の光源(28)を配置するステップとを含み、
前記第1の円は光検出器の中心にあり、第1の波長に基づいて決定された半径を有し、
前記第2の円は光検出器の中心にあり、第2の波長に基づいて決定された半径を有し、
前記各アレイは少なくとも4つの光源を備える
光生理(OP)センサ(12,40,42,44)の組み立て方法。 - 前記OPセンサ(12,40,42,44)のための光学設計(16)は、同一の波長又は波長帯の光を生成するように構成された複数の光源(28)を使用することを含み、
前記センサ(12,40,42,44)は、前記光検出器で捕捉された放射線の品質に基づき、光生理学的測定において使用するための1つ以上の前記複数の光源(28)を選択するように構成される請求項1に記載の方法。 - 前記少なくとも1つの生体組織タイプは、組織部位、組織の色、組織厚み、組織年齢及び組織状態のうちの1つ以上を含み、
前記少なくとも1つの生体組織タイプに係る光生理学的特性は、吸収係数、散乱係数、屈折率及び光学密度のうちの1つ以上を含む請求項1又は2に記載の方法。 - 複数の光源(28)と、
前記複数の光源(28)のうちの光源(28)からの光がモニタすべき生体組織を介して伝送した後、1つ以上の光源(28)から放射される放射線を捕捉するように構成された少なくとも1つの光検出器(30)とを備えた光生理(OP)センサ(12,40,42,44)であって、
前記複数の光源(28)はそれぞれ、モニタすべき生体組織タイプに係る光生理学的特性のモデル(14)によって決定される位置の光検出器(30)に対して相対的に配置され、
前記光検出器(30)から、前記複数の光源(28)のうちの各光源(28)の間隔は、前記各光源(28)からモニタすべき生体組織を介して前記光検出器(30)までそれぞれ伝送する光に対してモデル化された複数の光路長に基づくものであり、
第1の波長の複数の第1の光源(28)は第1の円の周上のアレイ内に配置され、
第2の波長の複数の第2の光源(28)は第2の円の周上のアレイ内に配置され、
前記第1の円は光検出器の中心にあり、第1の波長に基づいて決定された半径を有し、
前記第2の円は光検出器の中心にあり、第2の波長に基づいて決定された半径を有し、
前記各アレイは少なくとも4つの光源を備える
光生理(OP)センサ(12,40,42,44)。 - 前記複数の光源(28)は同一の波長又は同一の波長帯の光を発生するように構成され、
前記センサは捕捉された放射線の品質に基づいて光生理学的測定において使用するための1つ以上の前記複数の光源(28)を選択するように動作可能である、
請求項4に記載のOPセンサ(12,40,42,44)。 - 前記OPセンサ(12,40,42,44)はさらに、前記光検出器(30)からの測定信号に基づいて、前記複数の光源(28)を活性化及び非活性化するように動作可能なコントローラ(48)を備える、
請求項4又は5に記載のOPセンサ(12,40,42,44)。 - 請求項4〜6のうちのいずれか1つに記載の光生理(OP)センサ(12,40,42,44)と、
前記光検出器(30)によって測定された信号を分析して前記光検出器(30)からの少なくとも1つの生理的パラメータを決定する分析器(64)とを備える、
光生理(OP)システム。
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