JP6824989B2 - 超音波装置、およびホログラフィック超音波場を生成する方法 - Google Patents
超音波装置、およびホログラフィック超音波場を生成する方法 Download PDFInfo
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- JP6824989B2 JP6824989B2 JP2018530507A JP2018530507A JP6824989B2 JP 6824989 B2 JP6824989 B2 JP 6824989B2 JP 2018530507 A JP2018530507 A JP 2018530507A JP 2018530507 A JP2018530507 A JP 2018530507A JP 6824989 B2 JP6824989 B2 JP 6824989B2
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Description
[1]A. Meyer et al., "Journal of Applied Physics" 96(10): 5886-5891 (2004)、
[2]米国特許第8696164号、
[3]M. Moleron et al., "Applied Physics Letters" 105(11): 114109 (2014)、
[4]Y. Hertzberg et al., "Medical Physics" 38(12): 6407-6415 (2011)、
[5]国際公開第2013/108152号、
[6]米国特許出願公開第2003/145864号、
[7]G. Fleury et al., "Ultrasonics symposium (IUS)", 2010 IEEE, 11 October 2010, pages 876-885、
[8]米国特許出願公開第2005/277824号、および
[9]欧州特許出願第14004333.2 (本願の優先日において未公開)。
本発明の第1の態様(特徴)によれば、上述の目的は、少なくとも1つのホログラフィック超音波場を生成するよう構成された超音波装置によって達成(解決)され、その超音波装置は、一次(主要な)超音波を生成するための超音波源装置(デバイス)と、透過ホログラム装置とを含み、その透過ホログラム装置は、一次超音波が透過ホログラム装置を通って伝播(伝搬)することができるように、超音波源装置と音響的に接触するよう配置されており、従って、周囲空間に、例えば隣接の物体(内)に、少なくとも1つのホログラフィック超音波場を形成する二次超音波を生成する。超音波源装置は、駆動信号(駆動電流)に応答して一次超音波を放出できる少なくとも1つの超音波源素子(変換器素子)を含んでいる。透過ホログラム装置は、透過ホログラムと、周囲に面した露出した音響放射体面とを含んでいる。好ましくは、透過ホログラムは、一次超音波の受動的な静的な変更(調整、修正)を形成する、構造化された安定的な部品(構成要素)である。利点として、これによって、一次超音波源装置によって完全な音響強度が形成できる。さらに、それによって、フェーズド・アレイ源の複雑さを伴わずに、高度に輪郭の明確な(はっきりした)超音波場が可能になる。透過ホログラムの複雑さは、製造方法によってだけ制限を受ける。それがいったん製造されると、100×100ピクセルのホログラムに必要な制御は、500×500ピクセルを測定するホログラムより多くも少なくもない。
Claims (17)
- ホログラフィック超音波場(1)を生成するよう構成された超音波装置(100)であって、
− 超音波(2)を生成するよう適合化された超音波源装置(10)と、
− 透過ホログラム(21)および露出した音響放射体面(22)を有する透過ホログラム装置(20)と、
を含み、
前記透過ホログラム装置(20)は、前記超音波源装置(10)に結合され、および、前記音響放射体面(22)を通して前記超音波(2)を伝達し周囲空間に前記ホログラフィック超音波場(1)を生成するよう配置され、
− 前記透過ホログラム(21)は、前記音響放射体面(22)の方を向くホログラフィック表面(23)を有し、
− 前記ホログラフィック表面(23)は、前記透過ホログラム(21)の音響インピーダンスと異なる音響インピーダンスを有する流動性の埋め込み材料(25)を含む音響結合層(24)によって覆われており、
− 前記音響結合層(24)は、さらに、前記埋込み材料(25)を被覆し前記音響放射体面(22)を形成する柔軟なカバー・シート(26)を含み、
− 前記透過ホログラム(21)は、その前記ホログラフィック表面(23)の形状によって決定され前記超音波(2)の伝播方向に対して垂直に伸びるホログラム位相構造を有する構造化された部品であって、前記超音波(2)の波面を横切る位相および/または振幅が前記透過ホログラム(21)の前記ホログラム位相構造によって特異的に変化するように、前記波面と相互作用することができる構造化された部品であり、前記相互作用後に前記超音波(2)の回折および自己干渉によって前記ホログラフィック超音波場(1)が生成され、
− 前記音響放射体面(22)は、前記超音波(2)の半径方向の位相および/または振幅分布を変化させることなく前記超音波(2)を伝達することができるような滑らかな表面である、
超音波装置。 - 前記超音波源装置(10)は、単一の超音波源素子(11)と複数の超音波源素子のアレイのうちの少なくとも一方を含むものである、請求項1に記載の超音波装置。
- 前記超音波源装置(10)は、平面状のまたは曲面状の超音波(2)を生成するよう適合化されるものである、請求項1または2に記載の超音波装置。
- 前記透過ホログラム(21)は、平面状のまたは湾曲した形状を有するものである、請求項1乃至3のいずれかに記載の超音波装置。
- 前記透過ホログラム(21)は、生成される前記ホログラフィック超音波場(1)に応じて、逆回折問題を解くことによって形成されるものである、請求項1乃至4のいずれかに記載の超音波装置。
- 前記透過ホログラム(21)は、生成される前記ホログラフィック超音波場(1)に応じて誤差低減アルゴリズムを用いて、数値近似によって形成された位相ホログラムである、請求項1乃至5のいずれかに記載の超音波装置。
- 前記誤差低減アルゴリズムはゲルヒベルク−サクストン(Gerchberg-Saxton)誤差低減アルゴリズムを含むものである、請求項6に記載の超音波装置。
- 前記透過ホログラム装置(20)は、前記超音波源装置(10)に着脱可能に結合されるものである、請求項1乃至7のいずれかに記載の超音波装置。
- 前記透過ホログラム装置(20)には、少なくとも1つの識別装置(28)が設けられるものである、請求項1乃至8のいずれかに記載の超音波装置。
- 前記透過ホログラム装置(20)には、前記少なくとも1つの識別装置(28)として、光学的に読取り可能なマーカおよび電子識別装置のうちの少なくとも一方が設けられるものである、請求項9に記載の超音波装置。
- 前記超音波源装置(10)および前記透過ホログラム装置(20)の少なくとも一方に、少なくとも1つの位置合せ要素(27)が設けられている、請求項1乃至10のいずれかに記載の超音波装置。
- − 前記超音波源装置(10)に駆動電流を供給するよう配置された電源装置(31)と、
− 前記電源装置(31)に接続され、前記駆動電流の振幅波形を制御するよう配置された波形発生器(32)と、
をさらに含む、請求項1乃至11のいずれかに記載の超音波装置。 - 前記波形発生器(32)および前記電源装置(31)は、前記超音波(2)が連続波またはパルス波である形態で、前記超音波源装置(10)を駆動するよう適合化されるものである、請求項12に記載の超音波装置。
- 前記超音波源装置(10)を支持し、把持部(41)、プローブ・ヘッドおよび内視鏡装置の中の少なくとも1つを含む支持装置(40)、をさらに含む、請求項1乃至13のいずれかに記載の超音波装置。
- 前記透過ホログラム(21)が静的部品である、請求項1乃至14のいずれかに記載の超音波装置。
- 請求項1乃至15のいずれかに記載の超音波装置(10)が使用される、物体(3)にホログラフィック超音波場(1)を生成する方法であって、
− 前記物体(3)と音響的に接触するように前記超音波装置(100)を配置する工程と、
− 前記ホログラフィック超音波場(1)が前記物体(3)に生成されるように、前記超音波装置(100)を動作させる工程と、
を含む方法。 - 前記ホログラフィック超音波場(1)は、
− 前記物体(3)における超音波焦点の形成、
− 前記物体(3)における超音波画像の生成、
− 前記超音波による前記物体内の或る範囲のバイパス、
− 前記物体(3)の超音波画像化、および
− 超音波によるエネルギ伝達
という用途の中の少なくとも1つの用途のために整形されるものである、請求項16に記載の方法。
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