JP2006288504A - 生体情報処理装置及びその動作プログラム - Google Patents
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Abstract
【解決手段】 脈波取得手段(測定部10)によって生体の脈波情報を取得し、周波数解析手段(周波数解析部293)によって、脈波取得手段により取得した脈波情報に基づいて脈波の周波数に関する解析を行う。そして、特徴量抽出手段(周波数強度特徴量算出部2933)によって、周波数解析手段による解析によって得た脈波周波数情報から所定の特徴量を抽出し、脈波特性算出手段(脈波特性解析部294)によって、特徴量抽出手段により抽出した特徴量に基づいて所定の脈波特性(血管年齢)を算出する。
【選択図】 図4
Description
以下、本発明の一実施形態に係る生体情報処理装置について図面を参照しながら説明する。図1は、第1の実施形態における生体情報処理装置1の一構成例を示すブロック図である。図1に示すように生体情報処理装置1は、測定対象、つまり生体(被験者)に装着して該生体から生体情報、ここでは脈波(脈波波形情報)を取得するための測定部10と、測定装置本体としての本体部20とを備えている。
ところで、上記周波数解析(基本周波数強度算出)は、波形が無限に続く周期関数であるとしての解析であるが、実際の脈波は局在しているので、それに適した手法を用いることで性能改善が見込める。これにつき先ず理論的な点について説明する。脈波は、血管のシステム系が鼓動に相当するインパルス信号に応答した出力信号としてモデル化することができる。具体的には、当該脈波は、減衰(包絡線)の特徴を考慮した過渡現象モデルとしての図13に示す電気回路モデル(LCR回路)とほぼ等価と見なせる。R1<2√(L1/C1)とすると、図13の符号131に示す点線枠内の第1の部分回路(部分LCR回路)における、符号1311の矢印で示す出力電流i1は以下の式(2)で表される。
(A)上記第1の実施形態においては、周波数強度分布における第2基本周波数成分(第2基本周波数強度p2)を第1基本周波数成分(第1基本周波数強度p1)によって正規化(p2/p1)しているが、これに限定されず、第3基本周波数成分(第3基本周波数強度)以降を用いて正規化してもよい。例えば、第2基本周波数強度p2を、第3本周波数強度p3で割って正規化(p2/p3)したり、第4基本周波数強度p4で割って正規化(p2/p4)したりしてもよい。勿論、第0基本周波数強度を用いてもよい。また、ここでは、年代に応じた相関ある変化が顕著である第2基本周波数強度に基づいて正規化を行って特徴量を算出しているが、これに限らず、これ以外の基本周波数強度、例えば第3基本周波数強度を基にして特徴量の算出(正規化)を行ってもよい。この場合も上記と同様に第1基本周波数強度のみならず、その他の基本周波数強度を用いて正規化してもよい。
10 測定部(脈波取得手段)
29、29a 制御部
291 加速度脈波算出部
292 フーリエ変換部
293 周波数解析部(請求項1記載の周波数解析手段)
293a 周波数解析部(請求項9記載の周波数解析手段)
2931 基本周波数算出部
2932、2932a 周波数強度算出部
2933、2933a 周波数強度特徴量算出部(特徴量抽出手段)
294 脈波特性解析部(脈波特性算出手段)
Claims (11)
- 所定の生体情報を処理する生体情報処理装置であって、
生体の脈波情報を取得する脈波取得手段と、
前記脈波取得手段によって取得した脈波情報に基づいて脈波の周波数に関する解析を行う周波数解析手段と、
前記周波数解析手段による解析によって得られた脈波周波数情報から所定の特徴量を抽出する特徴量抽出手段と、
前記特徴量抽出手段によって抽出した特徴量に基づいて所定の脈波特性を算出する脈波特性算出手段とを備えることを特徴とする生体情報処理装置。 - 前記脈波特性算出手段は、前記特徴量に対して所定の変換情報を用いたデータ変換処理を行うことで前記脈波特性としての血管年齢を算出することを特徴とする請求項1記載の生体情報処理装置。
- 前記周波数解析手段は、脈波を2階微分した加速度脈波に対して解析を行うことを特徴とする請求項1又は2記載の生体情報処理装置。
- 前記周波数解析手段は、前記脈波情報から脈拍一拍毎の局所脈波情報を抽出し、該抽出した各局所脈波情報に対して解析を行うことを特徴とする請求項1〜3のいずれかに記載の生体情報処理装置。
- 前記周波数解析手段は、前記脈波周波数情報としての周波数の強度分布を算出し、該強度分布における少なくとも2つの極値情報に基づいて前記特徴量を算出することを特徴とする請求項1〜4のいずれかに記載の生体情報処理装置。
- 前記周波数解析手段は、前記周波数の強度分布における前記極値を中心とする所定の周波数範囲の周波数強度を積分して得られる周波数強度情報に基づいて特徴量を算出することを特徴とする請求項5記載の生体情報処理装置。
- 前記周波数解析手段は、フーリエ変換に基づく解析を行うことを特徴とする請求項1〜6のいずれかに記載の生体情報処理装置。
- 前記周波数解析手段は、過渡現象モデルに基づく解析を行うことを特徴とする請求項1〜4のいずれかに記載の生体情報処理装置。
- 前記周波数解析手段は、脈波を所定のインパルス信号に応答した出力信号と仮定する前記過渡現象モデルとしての所定の電気回路モデルに基づく解析を行うことを特徴とする請求項8記載の生体情報処理装置。
- 前記周波数解析手段は、前記電気回路モデルに基づく解析において、脈拍一拍毎の局所脈波情報における所定時刻の実測値を用いて、前記特徴量算出用の周波数強度を未知数に含む所定の連立方程式を解くことを特徴とする請求項9記載の生体情報処理装置。
- 所定の生体情報を処理する生体情報処理装置の動作プログラムであって、
脈波取得手段に、生体の脈波情報を取得させるステップと、
周波数解析手段に、前記脈波取得手段によって取得した脈波情報に基づいて脈波の周波数を解析させるステップと、
特徴量抽出手段に、前記周波数解析手段による解析によって得られた脈波周波数情報から所定の特徴量を抽出させるステップと、
脈波特性算出手段に、前記特徴量抽出手段によって抽出した特徴量に基づいて所定の脈波特性を算出させるステップとを少なくとも実行させることを特徴とする生体情報処理装置の動作プログラム。
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