JP6671021B2 - 神経測定において神経反応を検出するための方法およびデバイス - Google Patents
神経測定において神経反応を検出するための方法およびデバイス Download PDFInfo
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Description
この出願は、2013年11月22日に出願された豪州仮特許出願第2013904519号明細書の利益を主張し、同特許は、参照により本明細書に組み込まれる。
1つまたは複数の検知電極から神経測定を得るステップと、
フィルタテンプレートに対して神経測定を相関させるステップであって、フィルタテンプレートが、窓によって振幅変調された交流波形の少なくとも3つの半周期を含む、ステップと、
相関の出力から、神経測定において神経反応が存在するかどうかを決定するステップと
を含む方法を提供する。
1つまたは複数の検知電極から神経測定を得るための測定回路と、
フィルタテンプレートに対して神経測定を相関させるように構成されたプロセッサであって、フィルタテンプレートが、窓によって振幅変調された交流波形の少なくとも3つの半周期を含む、プロセッサであり、相関の出力から、神経測定において神経反応が存在するかどうかを決定するようにさらに構成される、プロセッサと
を備えるデバイスを提供する。
Lが奇数の場合:
1≦n≦(L+1)/2に対して、w(n)=2n/(L+1)
(L+1)/2+1≦n≦Lに対して、w(n)=2−2n/(L+1)
Lが偶数の場合:
1≦n≦L/2に対して、w(n)=(2n−1)/L
L/2+1≦n≦Lに対して、w(n)=2−(2n−1)/L
の係数w(n)を含む長さLの標準の三角窓であり得る。より好ましくは、三角窓は、サ
ンプル1およびLが0であるバートレット窓であり、本明細書における三角窓との記載は
、標準の三角窓と、上記で説明されるようなバートレット窓の両方を包含し、他の実質的
に三角形のまたはテント形状の窓関数も包含することが意図されることを理解されたい。
あるいは、窓は、バートレット窓、ハニング窓、矩形窓、または、適切なベータ値のカイ
ザーベッセル窓を含み得る。
1つまたは複数の検知電極から神経測定を得るステップと、
第1の時間オフセットにおいて、第1の測定値m1を生成するために、第1のフィルタテンプレートに対して神経測定を相関させるステップであって、第1のフィルタテンプレートが、第1の位相の交流波形を含む、ステップと、
第1の時間オフセットにおいて、第2の測定値m2を生成するために、第2のフィルタテンプレートに対して神経測定を相関させるステップであって、第2のフィルタテンプレートが、第1の位相に対して90度のオフセットが設けられた第2の位相の交流波形を含む、ステップと、
第1の時間オフセットから180度の非整数倍のところにあるオフセットである第2の時間オフセットにおいて、第3の測定値m3を生成するために、第1のフィルタテンプレートに対して神経測定を相関させるステップと、
第2の時間オフセットにおいて、第4の測定値m4を生成するために、第2のフィルタテンプレートに対して神経測定を相関させるステップと、
神経測定において神経反応が存在するかどうかを検出するために、m1〜m4を処理するステップと
を含む方法を提供する。
1つまたは複数の検知電極から神経測定を得るための測定回路と、
プロセッサであって、
第1の時間オフセットにおいて、第1の測定値m1を生成するために、第1のフィルタテンプレートに対して神経測定を相関させるステップであって、第1のフィルタテンプレートが、第1の位相の交流波形を含む、ステップと、
第1の時間オフセットにおいて、第2の測定値m2を生成するために、第2のフィルタテンプレートに対して神経測定を相関させるステップであって、第2のフィルタテンプレートが、第1の位相に対して90度のオフセットが設けられた第2の位相の交流波形を含む、ステップと、
第1の時間オフセットから180度の非整数倍のところにあるオフセットである第2の時間オフセットにおいて、第3の測定値m3を生成するために、第1のフィルタテンプレートに対して神経測定を相関させるステップと、
第2の時間オフセットにおいて、第4の測定値m4を生成するために、第2のフィルタテンプレートに対して神経測定を相関させるステップと、
神経測定において神経反応が存在するかどうかを検出するために、m1〜m4を処理するステップと
を行うように構成されたプロセッサと
を備えるデバイスを提供する。
神経反応とフィルタテンプレートとの間の近似時間遅延で、神経測定のDFTの基本周波数の実数および虚数部分を演算するステップと、
実数および虚数部分によって定義された位相を計算するステップと、
基本周波数に対して、計算された位相をπ/2に変更するために必要とされる時間調整を計算するステップと、
近似時間遅延と時間調整との総和として最適な時間遅延を定義するステップと
を含む方法を提供することができる。
第1の時間オフセットにおいて、第5の測定値m5を生成するために、第3のフィルタテンプレートに対して神経測定を相関させるステップであって、第3のフィルタテンプレートが、第1のフィルタテンプレートの周波数の2倍の第3の位相の交流波形を含む、ステップと、
第2の時間オフセットにおいて、第6の測定値m6を生成するために、第3のフィルタテンプレートに対して神経測定を相関させるステップと、
m5およびm6から、第1の時間オフセットと第2の時間オフセットとの間のアーチファクトの減衰を決定するステップと
を含む方法を提供することができる。
1.窓と信号S(t)を大まかに位置合わせする。
2.虚数(サイン)および実数(コサイン)項を計算する。
a.I=S(t).W(t).sin(1KHz.2π.t)および
b.Q=S(t).W(t).cos(1KHz.2π.t)
3.atan(Q/I)を使用してy軸に対する角度を見出す。
4.テンプレートが固定された既知の周波数を有するため、サイン項をその最大値に設定するために必要な時間シフトを計算する。
5.新しい遅延に対する虚数(サイン)および実数(コサイン)項を計算する。コサイン項は、サイン項よりはるかに小さいはずであり、方法がうまくいったことが確認される。
m1=a+c sinθ
m2=b+c cosθ
m3=ak+c conθ
m4=bk+c sinθ (15)
であり、従って、
110 移植制御ユニット
120 電極アレイ
122 電極
210 漸増推定器
300 神経反応検出器
302 入力
304 フィルタテンプレート
308 正弦波
310 バートレット窓
316 検出器出力
402 フィルタテンプレート
502 誘発反応
504 相互相関
506 アーチファクト
600 ハードウェア
902 全アーチファクト
904 出力
912 全アーチファクトベクトル
914 出力
1002 全アーチファクト
1004 出力
Claims (15)
- 神経測定において神経反応が存在するかどうかを検出するために、アーチファクトの存在下で得られた前記神経測定を処理する移植可能デバイスの作動方法であって、前記移植可能デバイスが、
1つまたは複数の検知電極から神経測定を得るステップと、
フィルタテンプレートに対して前記神経測定を相関させるステップであって、前記フィルタテンプレートが、窓によって振幅変調された交流波形の少なくとも3つの半周期を含む、ステップと、
前記相関の出力から、前記神経測定において神経反応が存在するかどうかを決定するステップと
を実行する、方法。 - 前記窓が三角窓を含む、請求項1に記載の方法。
- 前記三角窓が、以下のような、すなわち、
Lが奇数の場合:
1≦n≦(L+1)/2に対して、w(n)=2n/(L+1)
(L+1)/2+1≦n≦Lに対して、w(n)=2−2n/(L+1)
Lが偶数の場合:
1≦n≦L/2に対して、w(n)=(2n−1)/L
L/2+1≦n≦Lに対して、w(n)=2−(2n−1)/L
のような係数w(n)を含む長さLの標準の三角窓である、請求項2に記載の方法。 - 前記三角窓が、サンプル1およびLが0であるバートレット窓である、請求項2に記載の方法。
- 前記窓が、ハニング窓、矩形窓またはカイザーベッセル窓のうちの1つを含む、請求項1に記載の方法。
- 前記窓が、正弦曲線二項変換から導き出される1つまたは複数の基底関数を含む、請求項1に記載の方法。
- 前記フィルタテンプレートが、交流波形の4つの半周期を含む、請求項1〜6のいずれか一項に記載の方法。
- 前記フィルタテンプレートが、前記窓によって振幅変調されることによって修正された正弦波の半周期を含む、請求項1〜7のいずれか一項に記載の方法。
- 前記フィルタテンプレートが、前記窓によって振幅変調されることによって修正された余弦波の半周期を含む、請求項1〜7のいずれか一項に記載の方法。
- 前記相関の単一のポイントのみが計算される、請求項1〜9のいずれか一項に記載の方法。
- 前記相関の前記単一のポイントが、事前に定義された最適な時間遅延で計算される、請求項10に記載の方法。
- 前記移植可能デバイスが、信号対アーチファクト比が1より大きい際に、前記神経測定とフィルタテンプレートとの間の相互相関の第1または単一のポイントを生成すべきである前記最適な時間遅延を決定するステップをさらに実行する方法であって、前記最適な時間遅延を決定するステップが、
前記神経反応と前記フィルタテンプレートとの間の近似時間遅延で、前記神経測定のDFTの基本周波数の実数および虚数部分を演算するステップと、
前記実数および虚数部分によって定義された位相を計算するステップと、
前記フィルタテンプレートの基本周波数に対して、前記計算された位相をπ/2に変更するために必要とされる時間調整を計算するステップと、
前記近似時間遅延と前記時間調整との総和として前記最適な時間遅延を定義するステップと
を行うことによるものである、請求項11に記載の方法。 - 前記最適な時間遅延が、神経反応の検出の毎回の試みの前に再計算される、請求項11または12に記載の方法。
- 前記最適な時間遅延が、ユーザの姿勢の変化の検出に応答して再計算される、請求項11または12に記載の方法。
- 神経測定において神経反応が存在するかどうかを検出するために、アーチファクトの存在下で得られた前記神経測定を処理するための移植可能デバイスであって、
1つまたは複数の検知電極から神経測定を得るための測定回路と、
フィルタテンプレートに対して前記神経測定を相関させるように構成されたプロセッサであり、前記フィルタテンプレートが、窓によって振幅変調された交流波形の少なくとも3つの半周期を含む、プロセッサであって、前記相関の出力から、前記神経測定において神経反応が存在するかどうかを決定するようにさらに構成される、プロセッサと
を備える、デバイス。
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