JP7378429B2 - 音速マッピングを備えた合成送信フォーカシング超音波システム - Google Patents
音速マッピングを備えた合成送信フォーカシング超音波システム Download PDFInfo
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Description
本出願は、2018年5月15日に提出された米国仮特許出願第62/671,488号及び2019年4月25日に提出された米国仮特許出願第62/838,365号の優先権及び利益を主張し、これらは参照によりその全体が組み込まれる。
Weight(X,Z)=amplitude(X,Z)
適切な遅延特性の決定では、propagation_time(x,z)を、位置(x,z)における点に到達するために送信波面が必要とする伝播時間とし、ここでも、方位位置x=0は、送信ビームの中心軸に対応する。Xを、送信ビーム軸に対する受信ラインの方位角とする。深度Zにおける画像の点を形成するために、この受信されたマルチラインに適用される遅延は、次のとおりである。
Delay(X,Z)=propagation_time(X,Z)-propagation_time(0,Z)
ここで、propagation_time(0,Z)は、同じ深度であるが軸上である点に到達する時間である。
Claims (13)
- 画像フィールド内の音速変動をマッピングする超音波撮像システムであって、
トランスデューサアレイプローブと、
前記トランスデューサアレイプローブに結合され、複数の隣接する受信ライン位置を包含する超音波ビームを送信する送信ビームフォーマと、
前記トランスデューサアレイプローブに結合され、送信ビームに応答して、複数の隣接するマルチラインを生成するマルチラインビームフォーマと、
前記マルチラインビームフォーマに結合され、送信フォーカス効果を有する画像信号を生成する合成送信フォーカシング回路と、
前記マルチラインビームフォーマによって生成された前記マルチラインを受信するように結合され、画像フィールド内の点における位相変動を推定し、前記位相変動は、前記画像フィールド内の異なる点に対する周波数領域での角スペクトルの位相の変動に対応し、前記位相変動のマップを生成する位相収差推定器と、
前記位相収差推定器に結合され、前記位相変動の前記マップを表示するディスプレイと、
を含む、超音波撮像システム。 - 前記位相収差推定器はさらに、前記画像フィールド内の前記異なる点に対する前記周波数領域での角スペクトルを導出するために、前記マルチラインのデータセットの2次元フーリエ変換を行う、請求項1に記載の超音波撮像システム。
- 前記位相収差推定器はさらに、導出された前記角スペクトルの位相を推定する、請求項2に記載の超音波撮像システム。
- 前記位相収差推定器はさらに、異なる空間周波数間の前記角スペクトルの相互相関関数を計算する、請求項3に記載の超音波撮像システム。
- 前記位相収差推定器はさらに、平均化によって画像スペックルを平滑化する、請求項4に記載の超音波撮像システム。
- 前記位相収差推定器はさらに、隣接する空間周波数間の前記角スペクトルの相互相関関数の差分位相値を積分して、空間周波数の範囲にわたる絶対位相を生成する、請求項4に記載の超音波撮像システム。
- 前記位相収差推定器はさらに、前記絶対位相を時間周波数に沿って平均化する、請求項6に記載の超音波撮像システム。
- 前記位相収差推定器はさらに、前記絶対位相を使用して、前記角スペクトルの位相を除去する、請求項7に記載の超音波撮像システム。
- 前記位相収差推定器はさらに、前記画像フィールド内の異なる深度における点間の前記位相変動により生じる差分位相を計算する、請求項5に記載の超音波撮像システム。
- 前記位相収差推定器はさらに、前記画像フィールド内の同じ横方向位置であるが、異なる深度にある点間の前記差分位相を計算する、請求項9に記載の超音波撮像システム。
- 前記位相収差推定器はさらに、最小二乗平均推定器を使用して前記差分位相をフィッティングして、前記位相の局所曲率を見つける、請求項9に記載の超音波撮像システム。
- 前記位相収差推定器はさらに、ルックアップテーブルを用いて、前記差分位相をカラー値に変換する、請求項11に記載の超音波撮像システム。
- 前記位相収差推定器はさらに、ディスプレイ用の前記カラー値のカラーマップを形成する、請求項12に記載の超音波撮像システム。
Applications Claiming Priority (5)
Application Number | Priority Date | Filing Date | Title |
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US201862671488P | 2018-05-15 | 2018-05-15 | |
US62/671,488 | 2018-05-15 | ||
US201962838365P | 2019-04-25 | 2019-04-25 | |
US62/838,365 | 2019-04-25 | ||
PCT/EP2019/061883 WO2019219485A1 (en) | 2018-05-15 | 2019-05-09 | Synthetic transmit focusing ultrasound system with speed of sound mapping |
Publications (3)
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JP2021523788A JP2021523788A (ja) | 2021-09-09 |
JPWO2019219485A5 JPWO2019219485A5 (ja) | 2022-05-13 |
JP7378429B2 true JP7378429B2 (ja) | 2023-11-13 |
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EP (1) | EP3794370A1 (ja) |
JP (1) | JP7378429B2 (ja) |
CN (1) | CN112119327A (ja) |
WO (1) | WO2019219485A1 (ja) |
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US20230408662A1 (en) * | 2020-12-01 | 2023-12-21 | Koninklijke Philips N.V. | Retrospective transmit focusing using a transmit speed systems, devices, and methods |
CN115153622A (zh) * | 2022-06-08 | 2022-10-11 | 东北大学 | 一种基于虚源的基带延时乘累加超声波束形成方法 |
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- 2019-05-09 JP JP2020564161A patent/JP7378429B2/ja active Active
- 2019-05-09 CN CN201980032302.8A patent/CN112119327A/zh active Pending
- 2019-05-09 WO PCT/EP2019/061883 patent/WO2019219485A1/en unknown
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US20210196238A1 (en) | 2021-07-01 |
EP3794370A1 (en) | 2021-03-24 |
US11647991B2 (en) | 2023-05-16 |
CN112119327A (zh) | 2020-12-22 |
JP2021523788A (ja) | 2021-09-09 |
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