JP7370008B2 - 脳計測装置及び脳計測方法 - Google Patents
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Description
次に、上述した実施形態に係る脳計測装置の作用効果について説明する。
以上、本開示の実施形態に基づいて詳細に説明した。しかし、本開示は上記実施形態に限定されるものではない。本開示はその要旨を逸脱しない範囲で様々な変形が可能である。
Claims (11)
- 脳磁場を計測する複数の光励起磁気センサと、
前記複数の光励起磁気センサのそれぞれの位置における地磁気に係る磁場を計測する複数の地磁気磁場補正用磁気センサと、
前記複数の光励起磁気センサのそれぞれの位置における変動磁場を計測する複数のアクティブシールド用磁気センサと、
前記地磁気に係る磁場を補正するための地磁気磁場補正コイルと、
前記変動磁場を補正するためのアクティブシールドコイルと、を有する脳磁計と、
静磁場を印加するための静磁場コイルと、
傾斜磁場を印加するための傾斜磁場コイルと、
所定の周波数の送信パルスを送信するための送信コイルと、
前記送信パルスの送信によって生じた核磁気共鳴信号を検出する受信コイルと、を有するMRI装置と、
脳磁場の計測時には、前記複数の地磁気磁場補正用磁気センサの計測値、及び、前記複数のアクティブシールド用磁気センサの計測値に基づいて、前記地磁気磁場補正コイルに供給する電流、及び、前記アクティブシールドコイルに供給する電流を制御し、
MR画像の計測時には、前記静磁場コイル及び前記傾斜磁場コイルに供給する電流を制御して前記静磁場及び前記傾斜磁場を制御し、前記受信コイルの出力を基にMR画像を生成する制御装置と、
を備える脳計測装置。 - 前記地磁気磁場補正コイルは、前記地磁気の磁場を補正するための地磁気補正コイル及び前記地磁気の勾配磁場を補正するための勾配磁場補正コイルによって構成される、
請求項1記載の脳計測装置。 - 前記制御装置は、
前記地磁気に係る磁場を打ち消す磁場を発生させるように前記地磁気磁場補正コイルに供給する電流を決定し、前記変動磁場を打ち消す磁場を発生させるように前記アクティブシールドコイルに供給する電流を決定する、
請求項1又は2に記載の脳計測装置。 - 前記地磁気磁場補正コイル及び前記アクティブシールドコイルはそれぞれ、前記複数の光励起磁気センサを挟んで配置される一対のコイルである、請求項1~3のいずれか1項に記載の脳計測装置。
- 前記受信コイルに電気的に接続され、前記受信コイルを流れる電流を基に磁気信号を出力する出力コイルと、
前記出力コイルによって出力された前記磁気信号を検出する別の光励起磁気センサと、をさらに備え、
前記制御装置は、前記別の光励起磁気センサによって検出された前記磁気信号を基に前記MR画像を生成する、
請求項1~4のいずれか1項に記載の脳計測装置。 - 前記複数の光励起磁気センサは、被験者の頭皮に対し垂直な方向且つ同軸上に計測領域及び参照領域を有する軸型グラジオメータである、
請求項1~5のいずれか1項に記載の脳計測装置。 - 前記複数の光励起磁気センサ、前記複数の地磁気磁場補正用磁気センサ、前記複数のアクティブシールド用磁気センサ、及び前記受信コイルは、被験者の頭部に装着されるヘルメット型の非磁性フレームに固定されている、請求項1~6のいずれか1項に記載の脳計測装置。
- 高周波数の電磁ノイズを遮蔽するための電磁シールドをさらに備える、請求項1~7のいずれか1項に記載の脳計測装置。
- 前記複数の光励起磁気センサは、0~200Hzの範囲に含まれる周波数に感度を有するようにバイアス磁場が印加されるように構成され、
前記別の光励起磁気センサは、20kHz~500kHzの範囲に含まれる周波数に感度を有するようにバイアス磁場が印加されるように構成される、
請求項5に記載の脳計測装置。 - 脳磁場を計測する複数の光励起磁気センサと、
前記複数の光励起磁気センサのそれぞれの位置における地磁気に係る磁場を計測する複数の地磁気磁場補正用磁気センサと、
前記複数の光励起磁気センサのそれぞれの位置における変動磁場を計測する複数のアクティブシールド用磁気センサと、
前記地磁気に係る磁場を補正するための地磁気磁場補正コイルと、
前記変動磁場を補正するためのアクティブシールドコイルと、を有する脳磁計と、
静磁場を印加するための静磁場コイルと、
傾斜磁場を印加するための傾斜磁場コイルと、
所定の周波数の送信パルスを送信するための送信コイルと、
前記送信パルスの送信によって生じた核磁気共鳴信号を検出する受信コイルと、を有するMRI装置と、を用いた脳計測方法であって、
脳磁場の計測時には、前記複数の地磁気磁場補正用磁気センサの計測値、及び、前記複数のアクティブシールド用磁気センサの計測値に基づいて、前記地磁気磁場補正コイルに供給する電流、及び、前記アクティブシールドコイルに供給する電流を制御し、
MR画像の計測時には、前記静磁場コイル及び前記傾斜磁場コイルに供給する電流を制御して前記静磁場及び前記傾斜磁場を制御し、前記受信コイルの出力を基にMR画像を生成する、
脳計測方法。 - 前記地磁気磁場補正コイルは、前記地磁気の磁場を補正するための地磁気補正コイル及び前記地磁気の勾配磁場を補正するための勾配磁場補正コイルによって構成される、
請求項10記載の脳計測方法。
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